diff --git a/package.json b/package.json
index 08fb3f00..1b26352a 100644
--- a/package.json
+++ b/package.json
@@ -48,6 +48,7 @@
     "jwerty": "0.3.2",
     "handlebars": "4.0.6",
     "handlebars-loader": "1.4.0",
+    "json-loader": "0.5.4 ",
     "jquery": "2.1.0",
     "less": "2.7.1",
     "libtess": "1.2.2"
diff --git a/web/app/3d/craft/brep/cut-extrude.js b/web/app/3d/craft/brep/cut-extrude.js
index a71d26ba..7f360135 100644
--- a/web/app/3d/craft/brep/cut-extrude.js
+++ b/web/app/3d/craft/brep/cut-extrude.js
@@ -26,6 +26,7 @@ export function Cut(app, params) {
   }
 
   const extruder = new ParametricExtruder(face, params);
+  console.error('normal should be explicitly passed to the extruder#extrude method. there is no way to guess normal from points of sketch!');
   const cutter = combineCutters(sketch.map(s => extruder.extrude(s))) ;
   BREPValidator.validateToConsole(cutter);
   solid.vanish();
diff --git a/web/app/3d/modeler-app.js b/web/app/3d/modeler-app.js
index d7ad239e..d3a5126f 100644
--- a/web/app/3d/modeler-app.js
+++ b/web/app/3d/modeler-app.js
@@ -73,8 +73,8 @@ function App() {
   });
 }
 
-App.prototype.addShellOnScene = function(shell) {
-  const sceneSolid = new BREPSceneSolid(shell);
+App.prototype.addShellOnScene = function(shell, skin) {
+  const sceneSolid = new BREPSceneSolid(shell, undefined, skin);
   this.viewer.workGroup.add(sceneSolid.cadGroup);
   this.viewer.render()
 };
diff --git a/web/app/3d/scene/brep-scene-object.js b/web/app/3d/scene/brep-scene-object.js
index 90787a09..eb9da2ff 100644
--- a/web/app/3d/scene/brep-scene-object.js
+++ b/web/app/3d/scene/brep-scene-object.js
@@ -4,8 +4,8 @@ import {SceneSolid, SceneFace} from './scene-object'
 
 export class BREPSceneSolid extends SceneSolid {
 
-  constructor(shell, type) {
-    super(type);
+  constructor(shell, type, skin) {
+    super(type, undefined, skin);
     this.shell = shell;
     this.createGeometry();
   }
diff --git a/web/app/3d/scene/scene-object.js b/web/app/3d/scene/scene-object.js
index 4f8a8cbd..6499e93d 100644
--- a/web/app/3d/scene/scene-object.js
+++ b/web/app/3d/scene/scene-object.js
@@ -7,7 +7,7 @@ import DPR from '../../utils/dpr'
 
 export class SceneSolid {
   
-  constructor(type, id) {
+  constructor(type, id, skin) {
     this.tCadType = type || 'SOLID';
 
     this.cadGroup = new THREE.Object3D();
@@ -22,7 +22,7 @@ export class SceneSolid {
     this.mergeable = true;
     this.sceneFaces = [];
 
-    this.material = createSolidMaterial();
+    this.material = createSolidMaterial(skin);
   }
 
   addLineToScene(a, b) {
@@ -48,8 +48,8 @@ export class SceneSolid {
   }
 }
 
-function createSolidMaterial() {
-  return new THREE.MeshPhongMaterial({
+function createSolidMaterial(skin) {
+  return new THREE.MeshPhongMaterial(Object.assign({
     vertexColors: THREE.FaceColors,
     color: 0xB0C4DE,
     shininess: 0,
@@ -57,7 +57,7 @@ function createSolidMaterial() {
     polygonOffsetFactor : 1,
     polygonOffsetUnits : 2,
     //side : THREE.DoubleSide
-  });
+  }, skin));
 }
 
 export class SceneFace {
diff --git a/web/app/3d/tpi.js b/web/app/3d/tpi.js
index 577a21b4..f8ec8ceb 100644
--- a/web/app/3d/tpi.js
+++ b/web/app/3d/tpi.js
@@ -1,6 +1,7 @@
 import * as BREPPrimitives from '../brep/brep-primitives'
 import * as BREPBuilder from '../brep/brep-builder'
 import * as BREPBool from '../brep/operations/boolean'
+import * as IO from '../brep/brep-io'
 import {BREPValidator} from '../brep/brep-validator'
 import {HalfEdge, Edge} from '../brep/topo/edge';
 import {Loop} from '../brep/topo/loop';
@@ -20,6 +21,7 @@ export default {
     },
     topo: {
       HalfEdge, Edge, Loop, Face, Shell, Vertex
-    }
+    }, 
+    IO
   }
 }
\ No newline at end of file
diff --git a/web/app/brep/brep-io.js b/web/app/brep/brep-io.js
new file mode 100644
index 00000000..e9e8078a
--- /dev/null
+++ b/web/app/brep/brep-io.js
@@ -0,0 +1,41 @@
+
+export function toLoops(shell) {
+
+  const vertices = [];
+  for (let v of shell.vertices) {
+    vertices.push(v);
+  }
+
+  sortByXYZ(vertices);
+
+  const verticesIndex = new Map();
+  for (var i = 0; i < vertices.length; i++) {
+    verticesIndex.set(vertices[i], i);
+  }
+ 
+  const faces = shell.faces.map(f => {
+    const loops = [];
+    for (let l of f.loops) {
+      loops.push(l.halfEdges.map(e => verticesIndex.get(e.vertexA)));
+    }
+    return loops;
+  });
+  return {
+    format: 'LOOPS',
+    vertices: vertices.map(v => [v.point.x, v.point.y, v.point.z]),
+    faces
+  };
+}
+
+function sortByXYZ(vertices) {
+  vertices.sort((v1, v2) => {
+    let c = v1.point.x - v2.point.x;
+    if (c == 0) {
+      c = v1.point.y - v2.point.y;
+      if (c == 0) {
+        c = v1.point.z - v2.point.z;
+      }
+    }
+    return c;
+  });
+}
\ No newline at end of file
diff --git a/web/test/cases/brep-bool.js b/web/test/cases/brep-bool.js
index 1973ffd0..d8f23058 100644
--- a/web/test/cases/brep-bool.js
+++ b/web/test/cases/brep-bool.js
@@ -1,9 +1,12 @@
 import * as test from '../test'
+import {deepMerge} from '../utils/deep-merge'
 import {Matrix3} from '../../app/math/l3space'
 
-export default {
+const OPERANDS_MODE = false;
 
-  testNormalIntersection: function (env) {
+const CASE = {
+
+  testSmokedSalmon: function (env) {
     test.modeller(env.test((win, app) => {
       const box1 = app.TPI.brep.primitives.box(500, 500, 500);
       const box2 = app.TPI.brep.primitives.box(250, 250, 750, new Matrix3().translate(25, 25, 0));
@@ -14,6 +17,133 @@ export default {
       env.done();
     }));
   }
+};
 
+def('simple.union');
+def('simple.intersect');
+def('simple.subtract');
+def('overlap.face.intersect');
+def('overlap.face.subtract');
+def('overlap.face.half.intersect');
+def('overlap.face.half.subtract');
+def('overlap.face.edge1.intersect');
+def('overlap.face.edge1.subtract');
+def('overlap.face.edge1.half.intersect');
+def('overlap.face.edge1.half.subtract');
+def('overlap.face.edge2.intersect');
+def('overlap.face.edge2.subtract');
+def('overlap.face.edge2.half.intersect');
+def('overlap.face.edge2.half.subtract');
+def('overlap.face.inside.intersect');
+def('overlap.face.inside.subtract');
+def('overlap.face.inside.half.intersect');
+def('overlap.face.inside.half.subtract');
+def('overlap.kiss.edge.intersect');
+def('overlap.kiss.edge.subtract');
+def('overlap.kiss.edge.half.intersect');
+def('overlap.kiss.edge.half.subtract');
+def('overlap.kiss.edge4.intersect');
+def('overlap.kiss.edge4.subtract');
+def('overlap.kiss.edge4.half.intersect');
+def('overlap.kiss.edge4.half.subtract');
 
+def('star.intersect');
+def('star.subtract');
+
+function def(name) {
+  const funcName = 'test' + name.split(/\./).map(part => part.charAt(0).toUpperCase() + part.slice(1)).join('');
+  CASE[funcName] = function (env) {
+    test.modeller(env.test((win, app) => {
+      ddt(env, app, name);
+    }));
+  };
 }
+
+
+function ddt(env, app, name) {
+  const input = getInput(name);
+  const result = performOperation(app, input);
+  app.addShellOnScene(result);
+  compare(env, app, name, result);
+  env.done();
+}
+
+function compare(env, app, name, result) {
+  const out = require('./data/brep/' + name + '/out.json');
+  const resultData = shellToData(app.TPI.brep.IO, out.format, result);
+  const resultJSON = JSON.stringify(resultData).replace(/\s/g, '');
+  const expectedJSON = JSON.stringify(out).replace(/\s/g, '');
+  if (resultJSON != expectedJSON) {
+    console.log('EXPECTED:');
+    console.log(prettyJSON(out));
+    console.log('ACTUAL:');
+    console.log(prettyJSON(resultData));
+    env.fail('expected brep data different from actual. ^^see log above^^');
+  }
+}
+
+function prettyJSON(obj) {
+  return JSON.stringify(obj, null, 0);
+}
+
+function shellToData(io, format, shell) {
+  if (format == 'LOOPS') {
+    return io.toLoops(shell);    
+  } else {
+    throw 'unsupported type: ' + format;
+  }
+}
+
+function getInput(name) {
+  const input = readInput(name);
+  if (input.overrides) {
+    const overrides = readInput(input.overrides);
+    return deepMerge({}, overrides, input);
+  }
+  return input;
+}
+
+function readInput(name) {
+  return require('./data/brep/' + name + '/in.json');
+}
+
+function materialize(tpi, def) {
+  if (def.type == 'EXTRUDE') {
+    return tpi.brep.builder.createPrism(def.base.map(p => new tpi.brep.geom.Point().set3(p)), def.height);
+  } else {
+    throw 'unsupported type: ' + def.type;
+  }
+}
+
+function performOperation(app, input) {
+  const A = materialize(app.TPI, input.A);
+  const B = materialize(app.TPI, input.B);
+  
+  if (OPERANDS_MODE) {
+    app.addShellOnScene(A, {  
+      color: 0x800080,
+      transparent: true,
+      opacity: 0.5,
+    });
+    app.addShellOnScene(B, {
+      color: 0xfff44f,
+      transparent: true,
+      opacity: 0.5,
+    });
+    //throw '!operands mode. turn it off!'
+  }
+
+  const bool = app.TPI.brep.bool;
+  
+  if (input.operation == 'UNION') {
+    return bool.union(A, B);
+  } else if (input.operation == 'INTERSECT') {
+    return bool.intersect(A, B);
+  } else if (input.operation == 'SUBTRACT') {
+    return bool.subtract(A, B);
+  } else {
+    throw 'unknown operation: ' + input.operation;
+  } 
+}
+
+export default CASE;
diff --git a/web/test/cases/data/brep/overlap.face.edge1.half.intersect/in.json b/web/test/cases/data/brep/overlap.face.edge1.half.intersect/in.json
new file mode 100644
index 00000000..ff0466b7
--- /dev/null
+++ b/web/test/cases/data/brep/overlap.face.edge1.half.intersect/in.json
@@ -0,0 +1,24 @@
+{
+  "A": {
+    "type": "EXTRUDE",
+    "base": [
+      [-250, -250, 250],
+      [ 250, -250, 250],
+      [ 250,  250, 250],
+      [-250,  250, 250]
+    ],
+    "height": 500
+  },
+  "B": {
+    "type": "EXTRUDE",
+    "base": [
+      [-200, -200, 250],
+      [ 200, -200, 250],
+      [ 200,  250, 250],
+      [-200,  250, 250]
+    ],
+    "height": 250
+  },
+  "operation": "INTERSECT"
+}
+        
\ No newline at end of file
diff --git a/web/test/cases/data/brep/overlap.face.edge1.half.intersect/out.json b/web/test/cases/data/brep/overlap.face.edge1.half.intersect/out.json
new file mode 100644
index 00000000..cfabe80f
--- /dev/null
+++ b/web/test/cases/data/brep/overlap.face.edge1.half.intersect/out.json
@@ -0,0 +1,6 @@
+{
+  "format": "LOOPS", "vertices": [
+  [-200, -200, 0], [-200, -200, 250], [-200, 250, 0], [-200, 250, 250], [200, -200, 0], [200, -200, 250], [200, 250, 0],
+  [200, 250, 250]
+], "faces": [[[6, 2, 3, 7]], [[3, 1, 5, 7]], [[5, 1, 0, 4]], [[7, 5, 4, 6]], [[1, 3, 2, 0]], [[2, 6, 4, 0]]]
+}
diff --git a/web/test/cases/data/brep/overlap.face.edge1.half.subtract/in.json b/web/test/cases/data/brep/overlap.face.edge1.half.subtract/in.json
new file mode 100644
index 00000000..26adaec1
--- /dev/null
+++ b/web/test/cases/data/brep/overlap.face.edge1.half.subtract/in.json
@@ -0,0 +1,24 @@
+{
+  "A": {
+    "type": "EXTRUDE",
+    "base": [
+      [-250, -250, 250],
+      [ 250, -250, 250],
+      [ 250,  250, 250],
+      [-250,  250, 250]
+    ],
+    "height": 500
+  },
+  "B": {
+    "type": "EXTRUDE",
+    "base": [
+      [-200, -200, 250],
+      [ 200, -200, 250],
+      [ 200,  250, 250],
+      [-200,  250, 250]
+    ],
+    "height": 250
+  },
+  "operation": "SUBTRACT"
+}
+        
\ No newline at end of file
diff --git a/web/test/cases/data/brep/overlap.face.edge1.half.subtract/out.json b/web/test/cases/data/brep/overlap.face.edge1.half.subtract/out.json
new file mode 100644
index 00000000..ac4cf6fb
--- /dev/null
+++ b/web/test/cases/data/brep/overlap.face.edge1.half.subtract/out.json
@@ -0,0 +1,10 @@
+{
+  "format": "LOOPS", "vertices": [
+  [-250, -250, -250], [-250, -250, 250], [-250, 250, -250], [-250, 250, 250], [-200, -200, 0], [-200, -200, 250],
+  [-200, 250, 0], [-200, 250, 250], [200, -200, 0], [200, -200, 250], [200, 250, 0], [200, 250, 250], [250, -250, -250],
+  [250, -250, 250], [250, 250, -250], [250, 250, 250]
+], "faces": [
+  [[12, 13, 1, 0]], [[14, 15, 13, 12]], [[6, 10, 11, 15, 14, 2, 3, 7]], [[0, 1, 3, 2]], [[5, 7, 3, 1, 13, 15, 11, 9]],
+  [[0, 2, 14, 12]], [[5, 9, 8, 4]], [[9, 11, 10, 8]], [[7, 5, 4, 6]], [[10, 6, 4, 8]]
+]
+}
diff --git a/web/test/cases/data/brep/overlap.face.edge1.intersect/in.json b/web/test/cases/data/brep/overlap.face.edge1.intersect/in.json
new file mode 100644
index 00000000..7424d519
--- /dev/null
+++ b/web/test/cases/data/brep/overlap.face.edge1.intersect/in.json
@@ -0,0 +1,24 @@
+{
+  "A": {
+    "type": "EXTRUDE",
+    "base": [
+      [-250, -250, 250],
+      [ 250, -250, 250],
+      [ 250,  250, 250],
+      [-250,  250, 250]
+    ],
+    "height": 500
+  },
+  "B": {
+    "type": "EXTRUDE",
+    "base": [
+      [-200, -200, 250],
+      [ 200, -200, 250],
+      [ 200,  250, 250],
+      [-200,  250, 250]
+    ],
+    "height": 500
+  },
+  "operation": "INTERSECT"
+}
+        
\ No newline at end of file
diff --git a/web/test/cases/data/brep/overlap.face.edge1.intersect/out.json b/web/test/cases/data/brep/overlap.face.edge1.intersect/out.json
new file mode 100644
index 00000000..e8265884
--- /dev/null
+++ b/web/test/cases/data/brep/overlap.face.edge1.intersect/out.json
@@ -0,0 +1,6 @@
+{
+  "format": "LOOPS", "vertices": [
+  [-200, -200, -250], [-200, -200, 250], [-200, 250, -250], [-200, 250, 250], [200, -200, -250], [200, -200, 250],
+  [200, 250, -250], [200, 250, 250]
+], "faces": [[[2, 3, 7, 6]], [[3, 1, 5, 7]], [[0, 2, 6, 4]], [[0, 4, 5, 1]], [[4, 6, 7, 5]], [[2, 0, 1, 3]]]
+}
diff --git a/web/test/cases/data/brep/overlap.face.edge1.subtract/in.json b/web/test/cases/data/brep/overlap.face.edge1.subtract/in.json
new file mode 100644
index 00000000..3ef6ab30
--- /dev/null
+++ b/web/test/cases/data/brep/overlap.face.edge1.subtract/in.json
@@ -0,0 +1,24 @@
+{
+  "A": {
+    "type": "EXTRUDE",
+    "base": [
+      [-250, -250, 250],
+      [ 250, -250, 250],
+      [ 250,  250, 250],
+      [-250,  250, 250]
+    ],
+    "height": 500
+  },
+  "B": {
+    "type": "EXTRUDE",
+    "base": [
+      [-200, -200, 250],
+      [ 200, -200, 250],
+      [ 200,  250, 250],
+      [-200,  250, 250]
+    ],
+    "height": 500
+  },
+  "operation": "SUBTRACT"
+}
+        
\ No newline at end of file
diff --git a/web/test/cases/data/brep/overlap.face.edge1.subtract/out.json b/web/test/cases/data/brep/overlap.face.edge1.subtract/out.json
new file mode 100644
index 00000000..d845a072
--- /dev/null
+++ b/web/test/cases/data/brep/overlap.face.edge1.subtract/out.json
@@ -0,0 +1,6 @@
+{
+  "format": "LOOPS", "vertices": [
+  [0, 0, -250], [0, 0, 250], [0, 250, -250], [0, 250, 250], [250, 0, -250], [250, 0, 250], [250, 250, -250],
+  [250, 250, 250]
+], "faces": [[[5, 4, 6, 7]], [[2, 3, 7, 6]], [[3, 1, 5, 7]], [[0, 2, 6, 4]], [[0, 4, 5, 1]], [[2, 0, 1, 3]]]
+}
diff --git a/web/test/cases/data/brep/overlap.face.edge2.half.intersect/in.json b/web/test/cases/data/brep/overlap.face.edge2.half.intersect/in.json
new file mode 100644
index 00000000..5ce540ea
--- /dev/null
+++ b/web/test/cases/data/brep/overlap.face.edge2.half.intersect/in.json
@@ -0,0 +1,24 @@
+{
+  "A": {
+    "type": "EXTRUDE",
+    "base": [
+      [-250, -250, 250],
+      [ 250, -250, 250],
+      [ 250,  250, 250],
+      [-250,  250, 250]
+    ],
+    "height": 500
+  },
+  "B": {
+    "type": "EXTRUDE",
+    "base": [
+      [   0,    0, 250],
+      [ 250,    0, 250],
+      [ 250,  250, 250],
+      [   0,  250, 250]
+    ],
+    "height": 250
+  },
+  "operation": "INTERSECT"
+}
+        
\ No newline at end of file
diff --git a/web/test/cases/data/brep/overlap.face.edge2.half.intersect/out.json b/web/test/cases/data/brep/overlap.face.edge2.half.intersect/out.json
new file mode 100644
index 00000000..0105b58c
--- /dev/null
+++ b/web/test/cases/data/brep/overlap.face.edge2.half.intersect/out.json
@@ -0,0 +1,5 @@
+{
+  "format": "LOOPS", "vertices": [
+  [0, 0, 0], [0, 0, 250], [0, 250, 0], [0, 250, 250], [250, 0, 0], [250, 0, 250], [250, 250, 0], [250, 250, 250]
+], "faces": [[[4, 6, 7, 5]], [[6, 2, 3, 7]], [[3, 1, 5, 7]], [[5, 1, 0, 4]], [[1, 3, 2, 0]], [[2, 6, 4, 0]]]
+}
diff --git a/web/test/cases/data/brep/overlap.face.edge2.half.subtract/in.json b/web/test/cases/data/brep/overlap.face.edge2.half.subtract/in.json
new file mode 100644
index 00000000..7ffb948c
--- /dev/null
+++ b/web/test/cases/data/brep/overlap.face.edge2.half.subtract/in.json
@@ -0,0 +1,24 @@
+{
+  "A": {
+    "type": "EXTRUDE",
+    "base": [
+      [-250, -250, 250],
+      [ 250, -250, 250],
+      [ 250,  250, 250],
+      [-250,  250, 250]
+    ],
+    "height": 500
+  },
+  "B": {
+    "type": "EXTRUDE",
+    "base": [
+      [   0,    0, 250],
+      [ 250,    0, 250],
+      [ 250,  250, 250],
+      [   0,  250, 250]
+    ],
+    "height": 250
+  },
+  "operation": "SUBTRACT"
+}
+        
\ No newline at end of file
diff --git a/web/test/cases/data/brep/overlap.face.edge2.half.subtract/out.json b/web/test/cases/data/brep/overlap.face.edge2.half.subtract/out.json
new file mode 100644
index 00000000..4a7c5dc7
--- /dev/null
+++ b/web/test/cases/data/brep/overlap.face.edge2.half.subtract/out.json
@@ -0,0 +1,9 @@
+{
+  "format": "LOOPS", "vertices": [
+  [-250, -250, -250], [-250, -250, 250], [-250, 250, -250], [-250, 250, 250], [0, 0, 0], [0, 0, 250], [0, 250, 0],
+  [0, 250, 250], [250, -250, -250], [250, -250, 250], [250, 0, 0], [250, 0, 250], [250, 250, -250], [250, 250, 0]
+], "faces": [
+  [[8, 9, 1, 0]], [[13, 10, 11, 9, 8, 12]], [[6, 13, 12, 2, 3, 7]], [[0, 1, 3, 2]], [[5, 7, 3, 1, 9, 11]],
+  [[0, 2, 12, 8]], [[5, 11, 10, 4]], [[7, 5, 4, 6]], [[13, 6, 4, 10]]
+]
+}
diff --git a/web/test/cases/data/brep/overlap.face.edge2.intersect/in.json b/web/test/cases/data/brep/overlap.face.edge2.intersect/in.json
new file mode 100644
index 00000000..f21c03f7
--- /dev/null
+++ b/web/test/cases/data/brep/overlap.face.edge2.intersect/in.json
@@ -0,0 +1,24 @@
+{
+  "A": {
+    "type": "EXTRUDE",
+    "base": [
+      [-250, -250, 250],
+      [ 250, -250, 250],
+      [ 250,  250, 250],
+      [-250,  250, 250]
+    ],
+    "height": 500
+  },
+  "B": {
+    "type": "EXTRUDE",
+    "base": [
+      [   0,    0, 250],
+      [ 250,    0, 250],
+      [ 250,  250, 250],
+      [   0,  250, 250]
+    ],
+    "height": 500
+  },
+  "operation": "INTERSECT"
+}
+        
\ No newline at end of file
diff --git a/web/test/cases/data/brep/overlap.face.edge2.intersect/out.json b/web/test/cases/data/brep/overlap.face.edge2.intersect/out.json
new file mode 100644
index 00000000..d845a072
--- /dev/null
+++ b/web/test/cases/data/brep/overlap.face.edge2.intersect/out.json
@@ -0,0 +1,6 @@
+{
+  "format": "LOOPS", "vertices": [
+  [0, 0, -250], [0, 0, 250], [0, 250, -250], [0, 250, 250], [250, 0, -250], [250, 0, 250], [250, 250, -250],
+  [250, 250, 250]
+], "faces": [[[5, 4, 6, 7]], [[2, 3, 7, 6]], [[3, 1, 5, 7]], [[0, 2, 6, 4]], [[0, 4, 5, 1]], [[2, 0, 1, 3]]]
+}
diff --git a/web/test/cases/data/brep/overlap.face.edge2.subtract/in.json b/web/test/cases/data/brep/overlap.face.edge2.subtract/in.json
new file mode 100644
index 00000000..0447bae6
--- /dev/null
+++ b/web/test/cases/data/brep/overlap.face.edge2.subtract/in.json
@@ -0,0 +1,24 @@
+{
+  "A": {
+    "type": "EXTRUDE",
+    "base": [
+      [-250, -250, 250],
+      [ 250, -250, 250],
+      [ 250,  250, 250],
+      [-250,  250, 250]
+    ],
+    "height": 500
+  },
+  "B": {
+    "type": "EXTRUDE",
+    "base": [
+      [   0,    0, 250],
+      [ 250,    0, 250],
+      [ 250,  250, 250],
+      [   0,  250, 250]
+    ],
+    "height": 500
+  },
+  "operation": "SUBTRACT"
+}
+        
\ No newline at end of file
diff --git a/web/test/cases/data/brep/overlap.face.edge2.subtract/out.json b/web/test/cases/data/brep/overlap.face.edge2.subtract/out.json
new file mode 100644
index 00000000..9f285c57
--- /dev/null
+++ b/web/test/cases/data/brep/overlap.face.edge2.subtract/out.json
@@ -0,0 +1,9 @@
+{
+  "format": "LOOPS", "vertices": [
+  [-250, -250, -250], [-250, -250, 250], [-250, 250, -250], [-250, 250, 250], [0, 0, -250], [0, 0, 250], [0, 250, -250],
+  [0, 250, 250], [250, -250, -250], [250, -250, 250], [250, 0, -250], [250, 0, 250]
+], "faces": [
+  [[8, 9, 1, 0]], [[10, 11, 9, 8]], [[7, 6, 2, 3]], [[0, 1, 3, 2]], [[5, 7, 3, 1, 9, 11]], [[6, 4, 10, 8, 0, 2]],
+  [[10, 4, 5, 11]], [[4, 6, 7, 5]]
+]
+}
diff --git a/web/test/cases/data/brep/overlap.face.half.intersect/in.json b/web/test/cases/data/brep/overlap.face.half.intersect/in.json
new file mode 100644
index 00000000..bd0f67c1
--- /dev/null
+++ b/web/test/cases/data/brep/overlap.face.half.intersect/in.json
@@ -0,0 +1,24 @@
+{
+  "A": {
+    "type": "EXTRUDE",
+    "base": [
+      [-250, -250, 250],
+      [ 250, -250, 250],
+      [ 250,  250, 250],
+      [-250,  250, 250]
+    ],
+    "height": 500
+  },
+  "B": {
+    "type": "EXTRUDE",
+    "base": [
+      [   0,    0, 250],
+      [ 500,    0, 250],
+      [ 500,  500, 250],
+      [   0,  500, 250]
+    ],
+    "height": 250
+  },
+  "operation": "INTERSECT"
+}
+        
\ No newline at end of file
diff --git a/web/test/cases/data/brep/overlap.face.half.intersect/out.json b/web/test/cases/data/brep/overlap.face.half.intersect/out.json
new file mode 100644
index 00000000..0105b58c
--- /dev/null
+++ b/web/test/cases/data/brep/overlap.face.half.intersect/out.json
@@ -0,0 +1,5 @@
+{
+  "format": "LOOPS", "vertices": [
+  [0, 0, 0], [0, 0, 250], [0, 250, 0], [0, 250, 250], [250, 0, 0], [250, 0, 250], [250, 250, 0], [250, 250, 250]
+], "faces": [[[4, 6, 7, 5]], [[6, 2, 3, 7]], [[3, 1, 5, 7]], [[5, 1, 0, 4]], [[1, 3, 2, 0]], [[2, 6, 4, 0]]]
+}
diff --git a/web/test/cases/data/brep/overlap.face.half.subtract/in.json b/web/test/cases/data/brep/overlap.face.half.subtract/in.json
new file mode 100644
index 00000000..597ce70d
--- /dev/null
+++ b/web/test/cases/data/brep/overlap.face.half.subtract/in.json
@@ -0,0 +1,24 @@
+{
+  "A": {
+    "type": "EXTRUDE",
+    "base": [
+      [-250, -250, 250],
+      [ 250, -250, 250],
+      [ 250,  250, 250],
+      [-250,  250, 250]
+    ],
+    "height": 500
+  },
+  "B": {
+    "type": "EXTRUDE",
+    "base": [
+      [   0,    0, 250],
+      [ 500,    0, 250],
+      [ 500,  500, 250],
+      [   0,  500, 250]
+    ],
+    "height": 250
+  },
+  "operation": "SUBTRACT"
+}
+        
\ No newline at end of file
diff --git a/web/test/cases/data/brep/overlap.face.half.subtract/out.json b/web/test/cases/data/brep/overlap.face.half.subtract/out.json
new file mode 100644
index 00000000..4a7c5dc7
--- /dev/null
+++ b/web/test/cases/data/brep/overlap.face.half.subtract/out.json
@@ -0,0 +1,9 @@
+{
+  "format": "LOOPS", "vertices": [
+  [-250, -250, -250], [-250, -250, 250], [-250, 250, -250], [-250, 250, 250], [0, 0, 0], [0, 0, 250], [0, 250, 0],
+  [0, 250, 250], [250, -250, -250], [250, -250, 250], [250, 0, 0], [250, 0, 250], [250, 250, -250], [250, 250, 0]
+], "faces": [
+  [[8, 9, 1, 0]], [[13, 10, 11, 9, 8, 12]], [[6, 13, 12, 2, 3, 7]], [[0, 1, 3, 2]], [[5, 7, 3, 1, 9, 11]],
+  [[0, 2, 12, 8]], [[5, 11, 10, 4]], [[7, 5, 4, 6]], [[13, 6, 4, 10]]
+]
+}
diff --git a/web/test/cases/data/brep/overlap.face.inside.half.intersect/in.json b/web/test/cases/data/brep/overlap.face.inside.half.intersect/in.json
new file mode 100644
index 00000000..71c8943c
--- /dev/null
+++ b/web/test/cases/data/brep/overlap.face.inside.half.intersect/in.json
@@ -0,0 +1,24 @@
+{
+  "A": {
+    "type": "EXTRUDE",
+    "base": [
+      [-250, -250, 250],
+      [ 250, -250, 250],
+      [ 250,  250, 250],
+      [-250,  250, 250]
+    ],
+    "height": 500
+  },
+  "B": {
+    "type": "EXTRUDE",
+    "base": [
+      [-100, -100, 250],
+      [ 100, -100, 250],
+      [ 100,  100, 250],
+      [-100,  100, 250]
+    ],
+    "height": 250
+  },
+  "operation": "INTERSECT"
+}
+        
\ No newline at end of file
diff --git a/web/test/cases/data/brep/overlap.face.inside.half.intersect/out.json b/web/test/cases/data/brep/overlap.face.inside.half.intersect/out.json
new file mode 100644
index 00000000..536f4d70
--- /dev/null
+++ b/web/test/cases/data/brep/overlap.face.inside.half.intersect/out.json
@@ -0,0 +1,6 @@
+{
+  "format": "LOOPS", "vertices": [
+  [-100, -100, 0], [-100, -100, 250], [-100, 100, 0], [-100, 100, 250], [100, -100, 0], [100, -100, 250], [100, 100, 0],
+  [100, 100, 250]
+], "faces": [[[3, 1, 5, 7]], [[5, 1, 0, 4]], [[7, 5, 4, 6]], [[3, 7, 6, 2]], [[1, 3, 2, 0]], [[0, 2, 6, 4]]]
+}
diff --git a/web/test/cases/data/brep/overlap.face.inside.half.subtract/in.json b/web/test/cases/data/brep/overlap.face.inside.half.subtract/in.json
new file mode 100644
index 00000000..a15b095f
--- /dev/null
+++ b/web/test/cases/data/brep/overlap.face.inside.half.subtract/in.json
@@ -0,0 +1,24 @@
+{
+  "A": {
+    "type": "EXTRUDE",
+    "base": [
+      [-250, -250, 250],
+      [ 250, -250, 250],
+      [ 250,  250, 250],
+      [-250,  250, 250]
+    ],
+    "height": 500
+  },
+  "B": {
+    "type": "EXTRUDE",
+    "base": [
+      [-100, -100, 250],
+      [ 100, -100, 250],
+      [ 100,  100, 250],
+      [-100,  100, 250]
+    ],
+    "height": 250
+  },
+  "operation": "SUBTRACT"
+}
+        
\ No newline at end of file
diff --git a/web/test/cases/data/brep/overlap.face.inside.half.subtract/out.json b/web/test/cases/data/brep/overlap.face.inside.half.subtract/out.json
new file mode 100644
index 00000000..2dc8ba55
--- /dev/null
+++ b/web/test/cases/data/brep/overlap.face.inside.half.subtract/out.json
@@ -0,0 +1,10 @@
+{
+  "format": "LOOPS", "vertices": [
+  [-250, -250, -250], [-250, -250, 250], [-250, 250, -250], [-250, 250, 250], [-100, -100, 0], [-100, -100, 250],
+  [-100, 100, 0], [-100, 100, 250], [100, -100, 0], [100, -100, 250], [100, 100, 0], [100, 100, 250], [250, -250, -250],
+  [250, -250, 250], [250, 250, -250], [250, 250, 250]
+], "faces": [
+  [[12, 13, 1, 0]], [[14, 15, 13, 12]], [[2, 3, 15, 14]], [[0, 1, 3, 2]], [[3, 1, 13, 15], [5, 7, 11, 9]],
+  [[0, 2, 14, 12]], [[5, 9, 8, 4]], [[9, 11, 10, 8]], [[11, 7, 6, 10]], [[7, 5, 4, 6]], [[10, 6, 4, 8]]
+]
+}
diff --git a/web/test/cases/data/brep/overlap.face.inside.intersect/in.json b/web/test/cases/data/brep/overlap.face.inside.intersect/in.json
new file mode 100644
index 00000000..e4bfd3bf
--- /dev/null
+++ b/web/test/cases/data/brep/overlap.face.inside.intersect/in.json
@@ -0,0 +1,24 @@
+{
+  "A": {
+    "type": "EXTRUDE",
+    "base": [
+      [-250, -250, 250],
+      [ 250, -250, 250],
+      [ 250,  250, 250],
+      [-250,  250, 250]
+    ],
+    "height": 500
+  },
+  "B": {
+    "type": "EXTRUDE",
+    "base": [
+      [-100, -100, 250],
+      [ 100, -100, 250],
+      [ 100,  100, 250],
+      [-100,  100, 250]
+    ],
+    "height": 500
+  },
+  "operation": "INTERSECT"
+}
+        
\ No newline at end of file
diff --git a/web/test/cases/data/brep/overlap.face.inside.intersect/out.json b/web/test/cases/data/brep/overlap.face.inside.intersect/out.json
new file mode 100644
index 00000000..63662f9b
--- /dev/null
+++ b/web/test/cases/data/brep/overlap.face.inside.intersect/out.json
@@ -0,0 +1,6 @@
+{
+  "format": "LOOPS", "vertices": [
+  [-100, -100, -250], [-100, -100, 250], [-100, 100, -250], [-100, 100, 250], [100, -100, -250], [100, -100, 250],
+  [100, 100, -250], [100, 100, 250]
+], "faces": [[[3, 1, 5, 7]], [[0, 2, 6, 4]], [[0, 4, 5, 1]], [[4, 6, 7, 5]], [[6, 2, 3, 7]], [[2, 0, 1, 3]]]
+}
diff --git a/web/test/cases/data/brep/overlap.face.inside.subtract/in.json b/web/test/cases/data/brep/overlap.face.inside.subtract/in.json
new file mode 100644
index 00000000..fde2fb8b
--- /dev/null
+++ b/web/test/cases/data/brep/overlap.face.inside.subtract/in.json
@@ -0,0 +1,24 @@
+{
+  "A": {
+    "type": "EXTRUDE",
+    "base": [
+      [-250, -250, 250],
+      [ 250, -250, 250],
+      [ 250,  250, 250],
+      [-250,  250, 250]
+    ],
+    "height": 500
+  },
+  "B": {
+    "type": "EXTRUDE",
+    "base": [
+      [-100, -100, 250],
+      [ 100, -100, 250],
+      [ 100,  100, 250],
+      [-100,  100, 250]
+    ],
+    "height": 500
+  },
+  "operation": "SUBTRACT"
+}
+        
\ No newline at end of file
diff --git a/web/test/cases/data/brep/overlap.face.inside.subtract/out.json b/web/test/cases/data/brep/overlap.face.inside.subtract/out.json
new file mode 100644
index 00000000..d4cd896d
--- /dev/null
+++ b/web/test/cases/data/brep/overlap.face.inside.subtract/out.json
@@ -0,0 +1,10 @@
+{
+  "format": "LOOPS", "vertices": [
+  [-250, -250, -250], [-250, -250, 250], [-250, 250, -250], [-250, 250, 250], [-100, -100, -250], [-100, -100, 250],
+  [-100, 100, -250], [-100, 100, 250], [100, -100, -250], [100, -100, 250], [100, 100, -250], [100, 100, 250],
+  [250, -250, -250], [250, -250, 250], [250, 250, -250], [250, 250, 250]
+], "faces": [
+  [[12, 13, 1, 0]], [[14, 15, 13, 12]], [[2, 3, 15, 14]], [[0, 1, 3, 2]], [[3, 1, 13, 15], [5, 7, 11, 9]],
+  [[0, 2, 14, 12], [6, 4, 8, 10]], [[8, 4, 5, 9]], [[10, 8, 9, 11]], [[6, 10, 11, 7]], [[4, 6, 7, 5]]
+]
+}
diff --git a/web/test/cases/data/brep/overlap.face.intersect/in.json b/web/test/cases/data/brep/overlap.face.intersect/in.json
new file mode 100644
index 00000000..69dc5d2a
--- /dev/null
+++ b/web/test/cases/data/brep/overlap.face.intersect/in.json
@@ -0,0 +1,24 @@
+{
+  "A": {
+    "type": "EXTRUDE",
+    "base": [
+      [-250, -250, 250],
+      [ 250, -250, 250],
+      [ 250,  250, 250],
+      [-250,  250, 250]
+    ],
+    "height": 500
+  },
+  "B": {
+    "type": "EXTRUDE",
+    "base": [
+      [   0,    0, 250],
+      [ 500,    0, 250],
+      [ 500,  500, 250],
+      [   0,  500, 250]
+    ],
+    "height": 500
+  },
+  "operation": "INTERSECT"
+}
+        
\ No newline at end of file
diff --git a/web/test/cases/data/brep/overlap.face.intersect/out.json b/web/test/cases/data/brep/overlap.face.intersect/out.json
new file mode 100644
index 00000000..d845a072
--- /dev/null
+++ b/web/test/cases/data/brep/overlap.face.intersect/out.json
@@ -0,0 +1,6 @@
+{
+  "format": "LOOPS", "vertices": [
+  [0, 0, -250], [0, 0, 250], [0, 250, -250], [0, 250, 250], [250, 0, -250], [250, 0, 250], [250, 250, -250],
+  [250, 250, 250]
+], "faces": [[[5, 4, 6, 7]], [[2, 3, 7, 6]], [[3, 1, 5, 7]], [[0, 2, 6, 4]], [[0, 4, 5, 1]], [[2, 0, 1, 3]]]
+}
diff --git a/web/test/cases/data/brep/overlap.face.subtract/in.json b/web/test/cases/data/brep/overlap.face.subtract/in.json
new file mode 100644
index 00000000..f3506ad5
--- /dev/null
+++ b/web/test/cases/data/brep/overlap.face.subtract/in.json
@@ -0,0 +1,24 @@
+{
+  "A": {
+    "type": "EXTRUDE",
+    "base": [
+      [-250, -250, 250],
+      [ 250, -250, 250],
+      [ 250,  250, 250],
+      [-250,  250, 250]
+    ],
+    "height": 500
+  },
+  "B": {
+    "type": "EXTRUDE",
+    "base": [
+      [   0,    0, 250],
+      [ 500,    0, 250],
+      [ 500,  500, 250],
+      [   0,  500, 250]
+    ],
+    "height": 500
+  },
+  "operation": "SUBTRACT"
+}
+        
\ No newline at end of file
diff --git a/web/test/cases/data/brep/overlap.face.subtract/out.json b/web/test/cases/data/brep/overlap.face.subtract/out.json
new file mode 100644
index 00000000..9f285c57
--- /dev/null
+++ b/web/test/cases/data/brep/overlap.face.subtract/out.json
@@ -0,0 +1,9 @@
+{
+  "format": "LOOPS", "vertices": [
+  [-250, -250, -250], [-250, -250, 250], [-250, 250, -250], [-250, 250, 250], [0, 0, -250], [0, 0, 250], [0, 250, -250],
+  [0, 250, 250], [250, -250, -250], [250, -250, 250], [250, 0, -250], [250, 0, 250]
+], "faces": [
+  [[8, 9, 1, 0]], [[10, 11, 9, 8]], [[7, 6, 2, 3]], [[0, 1, 3, 2]], [[5, 7, 3, 1, 9, 11]], [[6, 4, 10, 8, 0, 2]],
+  [[10, 4, 5, 11]], [[4, 6, 7, 5]]
+]
+}
diff --git a/web/test/cases/data/brep/overlap.kiss.edge.half.intersect/in.json b/web/test/cases/data/brep/overlap.kiss.edge.half.intersect/in.json
new file mode 100644
index 00000000..ebdeceae
--- /dev/null
+++ b/web/test/cases/data/brep/overlap.kiss.edge.half.intersect/in.json
@@ -0,0 +1,7 @@
+{
+  "overrides": "overlap.kiss.edge.intersect", 
+  "B": {
+    "height": 250
+  }
+}
+        
\ No newline at end of file
diff --git a/web/test/cases/data/brep/overlap.kiss.edge.half.intersect/out.json b/web/test/cases/data/brep/overlap.kiss.edge.half.intersect/out.json
new file mode 100644
index 00000000..c3de922a
--- /dev/null
+++ b/web/test/cases/data/brep/overlap.kiss.edge.half.intersect/out.json
@@ -0,0 +1,5 @@
+{
+  "format": "LOOPS",
+  "vertices": [[-100, 100, 0], [-100, 100, 250], [100, -100, 0], [100, -100, 250], [250, 250, 0], [250, 250, 250]],
+  "faces": [[[1, 3, 5]], [[5, 3, 2, 4]], [[1, 5, 4, 0]], [[3, 1, 0, 2]], [[2, 0, 4]]]
+}
diff --git a/web/test/cases/data/brep/overlap.kiss.edge.half.subtract/in.json b/web/test/cases/data/brep/overlap.kiss.edge.half.subtract/in.json
new file mode 100644
index 00000000..e2d2aab0
--- /dev/null
+++ b/web/test/cases/data/brep/overlap.kiss.edge.half.subtract/in.json
@@ -0,0 +1,7 @@
+{
+  "overrides": "overlap.kiss.edge.subtract", 
+  "B": {
+    "height": 250
+  }
+}
+        
\ No newline at end of file
diff --git a/web/test/cases/data/brep/overlap.kiss.edge.half.subtract/out.json b/web/test/cases/data/brep/overlap.kiss.edge.half.subtract/out.json
new file mode 100644
index 00000000..d845a072
--- /dev/null
+++ b/web/test/cases/data/brep/overlap.kiss.edge.half.subtract/out.json
@@ -0,0 +1,6 @@
+{
+  "format": "LOOPS", "vertices": [
+  [0, 0, -250], [0, 0, 250], [0, 250, -250], [0, 250, 250], [250, 0, -250], [250, 0, 250], [250, 250, -250],
+  [250, 250, 250]
+], "faces": [[[5, 4, 6, 7]], [[2, 3, 7, 6]], [[3, 1, 5, 7]], [[0, 2, 6, 4]], [[0, 4, 5, 1]], [[2, 0, 1, 3]]]
+}
diff --git a/web/test/cases/data/brep/overlap.kiss.edge.intersect/in.json b/web/test/cases/data/brep/overlap.kiss.edge.intersect/in.json
new file mode 100644
index 00000000..f3138b4a
--- /dev/null
+++ b/web/test/cases/data/brep/overlap.kiss.edge.intersect/in.json
@@ -0,0 +1,23 @@
+{
+  "A": {
+    "type": "EXTRUDE",
+    "base": [
+      [-250, -250, 250],
+      [ 250, -250, 250],
+      [ 250,  250, 250],
+      [-250,  250, 250]
+    ],
+    "height": 500
+  },
+  "B": {
+    "type": "EXTRUDE",
+    "base": [
+      [ 100, -100, 250],
+      [ 250,  250, 250],
+      [-100,  100, 250]
+    ],
+    "height": 500
+  },
+  "operation": "INTERSECT"
+}
+        
\ No newline at end of file
diff --git a/web/test/cases/data/brep/overlap.kiss.edge.intersect/out.json b/web/test/cases/data/brep/overlap.kiss.edge.intersect/out.json
new file mode 100644
index 00000000..7db356d2
--- /dev/null
+++ b/web/test/cases/data/brep/overlap.kiss.edge.intersect/out.json
@@ -0,0 +1,5 @@
+{
+  "format": "LOOPS", "vertices": [
+  [-100, 100, -250], [-100, 100, 250], [100, -100, -250], [100, -100, 250], [250, 250, -250], [250, 250, 250]
+], "faces": [[[1, 3, 5]], [[2, 0, 4]], [[2, 4, 5, 3]], [[4, 0, 1, 5]], [[0, 2, 3, 1]]]
+}
diff --git a/web/test/cases/data/brep/overlap.kiss.edge.subtract/in.json b/web/test/cases/data/brep/overlap.kiss.edge.subtract/in.json
new file mode 100644
index 00000000..ee352163
--- /dev/null
+++ b/web/test/cases/data/brep/overlap.kiss.edge.subtract/in.json
@@ -0,0 +1,23 @@
+{
+  "A": {
+    "type": "EXTRUDE",
+    "base": [
+      [-250, -250, 250],
+      [ 250, -250, 250],
+      [ 250,  250, 250],
+      [-250,  250, 250]
+    ],
+    "height": 500
+  },
+  "B": {
+    "type": "EXTRUDE",
+    "base": [
+      [ 100, -100, 250],
+      [ 250,  250, 250],
+      [-100,  100, 250]
+    ],
+    "height": 500
+  },
+  "operation": "SUBTRACT"
+}
+        
\ No newline at end of file
diff --git a/web/test/cases/data/brep/overlap.kiss.edge.subtract/out.json b/web/test/cases/data/brep/overlap.kiss.edge.subtract/out.json
new file mode 100644
index 00000000..d845a072
--- /dev/null
+++ b/web/test/cases/data/brep/overlap.kiss.edge.subtract/out.json
@@ -0,0 +1,6 @@
+{
+  "format": "LOOPS", "vertices": [
+  [0, 0, -250], [0, 0, 250], [0, 250, -250], [0, 250, 250], [250, 0, -250], [250, 0, 250], [250, 250, -250],
+  [250, 250, 250]
+], "faces": [[[5, 4, 6, 7]], [[2, 3, 7, 6]], [[3, 1, 5, 7]], [[0, 2, 6, 4]], [[0, 4, 5, 1]], [[2, 0, 1, 3]]]
+}
diff --git a/web/test/cases/data/brep/overlap.kiss.edge4.half.intersect/in.json b/web/test/cases/data/brep/overlap.kiss.edge4.half.intersect/in.json
new file mode 100644
index 00000000..8f3f42a2
--- /dev/null
+++ b/web/test/cases/data/brep/overlap.kiss.edge4.half.intersect/in.json
@@ -0,0 +1,28 @@
+{
+  "A": {
+    "type": "EXTRUDE",
+    "base": [
+      [-250, -250, 250],
+      [ 250, -250, 250],
+      [ 250,  250, 250],
+      [-250,  250, 250]
+    ],
+    "height": 500
+  },
+  "B": {
+    "type": "EXTRUDE",
+    "base": [
+      [   0, -100, 250],
+      [ 250, -250, 250],
+      [ 100,    0, 250],
+      [ 250,  250, 250],
+      [   0,  100, 250],
+      [-250,  250, 250],
+      [-100,    0, 250],
+      [-250, -250, 250]
+    ],
+    "height": 250
+  },
+  "operation": "INTERSECT"
+}
+        
\ No newline at end of file
diff --git a/web/test/cases/data/brep/overlap.kiss.edge4.half.intersect/out.json b/web/test/cases/data/brep/overlap.kiss.edge4.half.intersect/out.json
new file mode 100644
index 00000000..d845a072
--- /dev/null
+++ b/web/test/cases/data/brep/overlap.kiss.edge4.half.intersect/out.json
@@ -0,0 +1,6 @@
+{
+  "format": "LOOPS", "vertices": [
+  [0, 0, -250], [0, 0, 250], [0, 250, -250], [0, 250, 250], [250, 0, -250], [250, 0, 250], [250, 250, -250],
+  [250, 250, 250]
+], "faces": [[[5, 4, 6, 7]], [[2, 3, 7, 6]], [[3, 1, 5, 7]], [[0, 2, 6, 4]], [[0, 4, 5, 1]], [[2, 0, 1, 3]]]
+}
diff --git a/web/test/cases/data/brep/overlap.kiss.edge4.half.subtract/in.json b/web/test/cases/data/brep/overlap.kiss.edge4.half.subtract/in.json
new file mode 100644
index 00000000..bd6030c9
--- /dev/null
+++ b/web/test/cases/data/brep/overlap.kiss.edge4.half.subtract/in.json
@@ -0,0 +1,28 @@
+{
+  "A": {
+    "type": "EXTRUDE",
+    "base": [
+      [-250, -250, 250],
+      [ 250, -250, 250],
+      [ 250,  250, 250],
+      [-250,  250, 250]
+    ],
+    "height": 500
+  },
+  "B": {
+    "type": "EXTRUDE",
+    "base": [
+      [   0, -100, 250],
+      [ 250, -250, 250],
+      [ 100,    0, 250],
+      [ 250,  250, 250],
+      [   0,  100, 250],
+      [-250,  250, 250],
+      [-100,    0, 250],
+      [-250, -250, 250]
+    ],
+    "height": 250
+  },
+  "operation": "SUBTRACT"
+}
+        
\ No newline at end of file
diff --git a/web/test/cases/data/brep/overlap.kiss.edge4.half.subtract/out.json b/web/test/cases/data/brep/overlap.kiss.edge4.half.subtract/out.json
new file mode 100644
index 00000000..d845a072
--- /dev/null
+++ b/web/test/cases/data/brep/overlap.kiss.edge4.half.subtract/out.json
@@ -0,0 +1,6 @@
+{
+  "format": "LOOPS", "vertices": [
+  [0, 0, -250], [0, 0, 250], [0, 250, -250], [0, 250, 250], [250, 0, -250], [250, 0, 250], [250, 250, -250],
+  [250, 250, 250]
+], "faces": [[[5, 4, 6, 7]], [[2, 3, 7, 6]], [[3, 1, 5, 7]], [[0, 2, 6, 4]], [[0, 4, 5, 1]], [[2, 0, 1, 3]]]
+}
diff --git a/web/test/cases/data/brep/overlap.kiss.edge4.intersect/in.json b/web/test/cases/data/brep/overlap.kiss.edge4.intersect/in.json
new file mode 100644
index 00000000..6acd0519
--- /dev/null
+++ b/web/test/cases/data/brep/overlap.kiss.edge4.intersect/in.json
@@ -0,0 +1,28 @@
+{
+  "A": {
+    "type": "EXTRUDE",
+    "base": [
+      [-250, -250, 250],
+      [ 250, -250, 250],
+      [ 250,  250, 250],
+      [-250,  250, 250]
+    ],
+    "height": 500
+  },
+  "B": {
+    "type": "EXTRUDE",
+    "base": [
+      [   0, -100, 250],
+      [ 250, -250, 250],
+      [ 100,    0, 250],
+      [ 250,  250, 250],
+      [   0,  100, 250],
+      [-250,  250, 250],
+      [-100,    0, 250],
+      [-250, -250, 250]
+    ],
+    "height": 500
+  },
+  "operation": "INTERSECT"
+}
+        
\ No newline at end of file
diff --git a/web/test/cases/data/brep/overlap.kiss.edge4.intersect/out.json b/web/test/cases/data/brep/overlap.kiss.edge4.intersect/out.json
new file mode 100644
index 00000000..b3a05af8
--- /dev/null
+++ b/web/test/cases/data/brep/overlap.kiss.edge4.intersect/out.json
@@ -0,0 +1,10 @@
+{
+  "format": "LOOPS", "vertices": [
+  [-250, -250, -250], [-250, -250, 250], [-250, 250, -250], [-250, 250, 250], [-100, 0, -250], [-100, 0, 250],
+  [0, -100, -250], [0, -100, 250], [0, 100, -250], [0, 100, 250], [100, 0, -250], [100, 0, 250], [250, -250, -250],
+  [250, -250, 250], [250, 250, -250], [250, 250, 250]
+], "faces": [
+  [[1, 7, 13, 11, 15, 9, 3, 5]], [[6, 0, 4, 2, 8, 14, 10, 12]], [[6, 12, 13, 7]], [[12, 10, 11, 13]],
+  [[10, 14, 15, 11]], [[14, 8, 9, 15]], [[8, 2, 3, 9]], [[2, 4, 5, 3]], [[4, 0, 1, 5]], [[0, 6, 7, 1]]
+]
+}
diff --git a/web/test/cases/data/brep/overlap.kiss.edge4.subtract/in.json b/web/test/cases/data/brep/overlap.kiss.edge4.subtract/in.json
new file mode 100644
index 00000000..06715db5
--- /dev/null
+++ b/web/test/cases/data/brep/overlap.kiss.edge4.subtract/in.json
@@ -0,0 +1,28 @@
+{
+  "A": {
+    "type": "EXTRUDE",
+    "base": [
+      [-250, -250, 250],
+      [ 250, -250, 250],
+      [ 250,  250, 250],
+      [-250,  250, 250]
+    ],
+    "height": 500
+  },
+  "B": {
+    "type": "EXTRUDE",
+    "base": [
+      [   0, -100, 250],
+      [ 250, -250, 250],
+      [ 100,    0, 250],
+      [ 250,  250, 250],
+      [   0,  100, 250],
+      [-250,  250, 250],
+      [-100,    0, 250],
+      [-250, -250, 250]
+    ],
+    "height": 500
+  },
+  "operation": "SUBTRACT"
+}
+        
\ No newline at end of file
diff --git a/web/test/cases/data/brep/overlap.kiss.edge4.subtract/out.json b/web/test/cases/data/brep/overlap.kiss.edge4.subtract/out.json
new file mode 100644
index 00000000..d845a072
--- /dev/null
+++ b/web/test/cases/data/brep/overlap.kiss.edge4.subtract/out.json
@@ -0,0 +1,6 @@
+{
+  "format": "LOOPS", "vertices": [
+  [0, 0, -250], [0, 0, 250], [0, 250, -250], [0, 250, 250], [250, 0, -250], [250, 0, 250], [250, 250, -250],
+  [250, 250, 250]
+], "faces": [[[5, 4, 6, 7]], [[2, 3, 7, 6]], [[3, 1, 5, 7]], [[0, 2, 6, 4]], [[0, 4, 5, 1]], [[2, 0, 1, 3]]]
+}
diff --git a/web/test/cases/data/brep/simple.intersect/in.json b/web/test/cases/data/brep/simple.intersect/in.json
new file mode 100644
index 00000000..f6dbbde1
--- /dev/null
+++ b/web/test/cases/data/brep/simple.intersect/in.json
@@ -0,0 +1,24 @@
+{
+  "A": {
+    "type": "EXTRUDE",
+    "base": [
+      [-250, -250, 250],
+      [ 250, -250, 250],
+      [ 250,  250, 250],
+      [-250,  250, 250]
+    ],
+    "height": 500
+  },
+  "B": {
+    "type": "EXTRUDE",
+    "base": [
+      [   0,    0, 0],
+      [ 500,    0, 0],
+      [ 500,  500, 0],
+      [   0,  500, 0]
+    ],
+    "height": 500
+  },
+  "operation": "INTERSECT"
+}
+        
\ No newline at end of file
diff --git a/web/test/cases/data/brep/simple.intersect/out.json b/web/test/cases/data/brep/simple.intersect/out.json
new file mode 100644
index 00000000..648c42de
--- /dev/null
+++ b/web/test/cases/data/brep/simple.intersect/out.json
@@ -0,0 +1,5 @@
+{
+  "format": "LOOPS", "vertices": [
+  [0, 0, -250], [0, 0, 0], [0, 250, -250], [0, 250, 0], [250, 0, -250], [250, 0, 0], [250, 250, -250], [250, 250, 0]
+], "faces": [[[7, 5, 4, 6]], [[3, 7, 6, 2]], [[0, 2, 6, 4]], [[0, 4, 5, 1]], [[2, 0, 1, 3]], [[7, 3, 1, 5]]]
+}
diff --git a/web/test/cases/data/brep/simple.subtract/in.json b/web/test/cases/data/brep/simple.subtract/in.json
new file mode 100644
index 00000000..9ef703d6
--- /dev/null
+++ b/web/test/cases/data/brep/simple.subtract/in.json
@@ -0,0 +1,24 @@
+{
+  "A": {
+    "type": "EXTRUDE",
+    "base": [
+      [-250, -250, 250],
+      [ 250, -250, 250],
+      [ 250,  250, 250],
+      [-250,  250, 250]
+    ],
+    "height": 500
+  },
+  "B": {
+    "type": "EXTRUDE",
+    "base": [
+      [   0,    0, 0],
+      [ 500,    0, 0],
+      [ 500,  500, 0],
+      [   0,  500, 0]
+    ],
+    "height": 500
+  },
+  "operation": "SUBTRACT"
+}
+        
\ No newline at end of file
diff --git a/web/test/cases/data/brep/simple.subtract/out.json b/web/test/cases/data/brep/simple.subtract/out.json
new file mode 100644
index 00000000..ad536f6c
--- /dev/null
+++ b/web/test/cases/data/brep/simple.subtract/out.json
@@ -0,0 +1,9 @@
+{
+  "format": "LOOPS", "vertices": [
+  [-250, -250, -250], [-250, -250, 250], [-250, 250, -250], [-250, 250, 250], [0, 0, -250], [0, 0, 0], [0, 250, -250],
+  [0, 250, 0], [250, -250, -250], [250, -250, 250], [250, 0, -250], [250, 0, 0], [250, 250, 0], [250, 250, 250]
+], "faces": [
+  [[8, 9, 1, 0]], [[11, 12, 13, 9, 8, 10]], [[12, 7, 6, 2, 3, 13]], [[0, 1, 3, 2]], [[3, 1, 9, 13]],
+  [[6, 4, 10, 8, 0, 2]], [[10, 4, 5, 11]], [[4, 6, 7, 5]], [[7, 12, 11, 5]]
+]
+}
diff --git a/web/test/cases/data/brep/simple.union/in.json b/web/test/cases/data/brep/simple.union/in.json
new file mode 100644
index 00000000..dcae7f32
--- /dev/null
+++ b/web/test/cases/data/brep/simple.union/in.json
@@ -0,0 +1,24 @@
+{
+  "A": {
+    "type": "EXTRUDE",
+    "base": [
+      [-250, -250, 250],
+      [ 250, -250, 250],
+      [ 250,  250, 250],
+      [-250,  250, 250]
+    ],
+    "height": 500
+  },
+  "B": {
+    "type": "EXTRUDE",
+    "base": [
+      [   0,    0, 0],
+      [ 500,    0, 0],
+      [ 500,  500, 0],
+      [   0,  500, 0]
+    ],
+    "height": 500
+  },
+  "operation": "UNION"
+}
+        
\ No newline at end of file
diff --git a/web/test/cases/data/brep/simple.union/out.json b/web/test/cases/data/brep/simple.union/out.json
new file mode 100644
index 00000000..66aecbbd
--- /dev/null
+++ b/web/test/cases/data/brep/simple.union/out.json
@@ -0,0 +1,11 @@
+{
+  "format": "LOOPS", "vertices": [
+  [-250, -250, -250], [-250, -250, 250], [-250, 250, -250], [-250, 250, 250], [0, 0, -500], [0, 0, -250],
+  [0, 250, -250], [0, 250, 0], [0, 500, -500], [0, 500, 0], [250, -250, -250], [250, -250, 250], [250, 0, -250],
+  [250, 0, 0], [250, 250, 0], [250, 250, 250], [500, 0, -500], [500, 0, 0], [500, 500, -500], [500, 500, 0]
+], "faces": [
+  [[10, 11, 1, 0]], [[13, 14, 15, 11, 10, 12]], [[14, 7, 6, 2, 3, 15]], [[0, 1, 3, 2]], [[3, 1, 11, 15]],
+  [[6, 5, 12, 10, 0, 2]], [[12, 5, 4, 16, 17, 13]], [[18, 19, 17, 16]], [[8, 9, 19, 18]], [[5, 6, 7, 9, 8, 4]],
+  [[7, 14, 13, 17, 19, 9]], [[4, 8, 18, 16]]
+]
+}
diff --git a/web/test/cases/data/brep/star.intersect/in.json b/web/test/cases/data/brep/star.intersect/in.json
new file mode 100644
index 00000000..eec19d58
--- /dev/null
+++ b/web/test/cases/data/brep/star.intersect/in.json
@@ -0,0 +1,30 @@
+{
+  "A": {
+    "type": "EXTRUDE",
+    "base": [
+      [-250, -250, 250],
+      [ 250, -250, 250],
+      [ 250,  250, 250],
+      [-250,  250, 250]
+    ],
+    "height": 500
+  },
+  "B": {
+    "type": "EXTRUDE",
+    "base": [
+      [  50,   50, 250],
+      [   0,  200, 250],
+      [ -50,   50, 250],
+      [-200,    0, 250],
+      [ -50,  -50, 250],
+      [-200, -200, 250],
+      [   0, -100, 250],
+      [ 200, -200, 250],
+      [  50,  -50, 250],
+      [ 200,    0, 250]
+    ],
+    "height": 200
+  },
+  "operation": "INTERSECT"
+}
+        
\ No newline at end of file
diff --git a/web/test/cases/data/brep/star.intersect/out.json b/web/test/cases/data/brep/star.intersect/out.json
new file mode 100644
index 00000000..27dada6f
--- /dev/null
+++ b/web/test/cases/data/brep/star.intersect/out.json
@@ -0,0 +1,11 @@
+{
+  "format": "LOOPS", "vertices": [
+  [-200, -200, 50], [-200, -200, 250], [-200, 0, 50], [-200, 0, 250], [-50, -50, 50], [-50, -50, 250], [-50, 50, 50],
+  [-50, 50, 250], [0, -100, 50], [0, -100, 250], [0, 200, 50], [0, 200, 250], [50, -50, 50], [50, -50, 250],
+  [50, 50, 50], [50, 50, 250], [200, -200, 50], [200, -200, 250], [200, 0, 50], [200, 0, 250]
+], "faces": [
+  [[19, 15, 11, 7, 3, 5, 1, 9, 17, 13]], [[11, 15, 14, 10]], [[7, 11, 10, 6]], [[3, 7, 6, 2]], [[5, 3, 2, 4]],
+  [[1, 5, 4, 0]], [[9, 1, 0, 8]], [[17, 9, 8, 16]], [[13, 17, 16, 12]], [[19, 13, 12, 18]], [[15, 19, 18, 14]],
+  [[14, 18, 12, 16, 8, 0, 4, 2, 6, 10]]
+]
+}
diff --git a/web/test/cases/data/brep/star.subtract/in.json b/web/test/cases/data/brep/star.subtract/in.json
new file mode 100644
index 00000000..3e1d645c
--- /dev/null
+++ b/web/test/cases/data/brep/star.subtract/in.json
@@ -0,0 +1,30 @@
+{
+  "A": {
+    "type": "EXTRUDE",
+    "base": [
+      [-250, -250, 250],
+      [ 250, -250, 250],
+      [ 250,  250, 250],
+      [-250,  250, 250]
+    ],
+    "height": 500
+  },
+  "B": {
+    "type": "EXTRUDE",
+    "base": [
+      [  50,   50, 250],
+      [   0,  200, 250],
+      [ -50,   50, 250],
+      [-200,    0, 250],
+      [ -50,  -50, 250],
+      [-200, -200, 250],
+      [   0, -100, 250],
+      [ 200, -200, 250],
+      [  50,  -50, 250],
+      [ 200,    0, 250]
+    ],
+    "height": 200
+  },
+  "operation": "SUBTRACT"
+}
+        
\ No newline at end of file
diff --git a/web/test/cases/data/brep/star.subtract/out.json b/web/test/cases/data/brep/star.subtract/out.json
new file mode 100644
index 00000000..40c51f5d
--- /dev/null
+++ b/web/test/cases/data/brep/star.subtract/out.json
@@ -0,0 +1,14 @@
+{
+  "format": "LOOPS", "vertices": [
+  [-250, -250, -250], [-250, -250, 250], [-250, 250, -250], [-250, 250, 250], [-200, -200, 50], [-200, -200, 250],
+  [-200, 0, 50], [-200, 0, 250], [-50, -50, 50], [-50, -50, 250], [-50, 50, 50], [-50, 50, 250], [0, -100, 50],
+  [0, -100, 250], [0, 200, 50], [0, 200, 250], [50, -50, 50], [50, -50, 250], [50, 50, 50], [50, 50, 250],
+  [200, -200, 50], [200, -200, 250], [200, 0, 50], [200, 0, 250], [250, -250, -250], [250, -250, 250], [250, 250, -250],
+  [250, 250, 250]
+], "faces": [
+  [[24, 25, 1, 0]], [[26, 27, 25, 24]], [[2, 3, 27, 26]], [[0, 1, 3, 2]],
+  [[3, 1, 25, 27], [19, 23, 17, 21, 13, 5, 9, 7, 11, 15]], [[0, 2, 26, 24]], [[19, 15, 14, 18]], [[15, 11, 10, 14]],
+  [[11, 7, 6, 10]], [[7, 9, 8, 6]], [[9, 5, 4, 8]], [[5, 13, 12, 4]], [[13, 21, 20, 12]], [[21, 17, 16, 20]],
+  [[17, 23, 22, 16]], [[23, 19, 18, 22]], [[16, 22, 18, 14, 10, 6, 8, 4, 12, 20]]
+]
+}
diff --git a/web/test/runner.html b/web/test/runner.html
index 4cc953bf..392200f1 100644
--- a/web/test/runner.html
+++ b/web/test/runner.html
@@ -8,7 +8,10 @@
   <div id="control-bar" class="page-row">
     <button id="run-button" class="action-item" data-action="Run"><i class="fa fa-play"></i></button>
     <!--<button id="pause-button"><i class="fa fa-pause"></i></button>-->
-    <span id="status" style="float: right">0 run / 0 passed / 0 failures</span>
+    <span id="status" style="float: right">
+      <span class="report-amount-run">0</span> run / 
+      <span class="report-amount-passed">0</span> passed / 
+      <span class="report-amount-failed">0</span> failed</span>
   </div>
   <div id="sandbox"></div>
   <div class="page-row" id="test-list">
diff --git a/web/test/runner.js b/web/test/runner.js
index 2774ce88..95009338 100644
--- a/web/test/runner.js
+++ b/web/test/runner.js
@@ -37,7 +37,7 @@ function scheduleTestCase(testCase, caseId) {
 function scheduleTest(test, id) {
   queue.push({
       id,
-      func: test
+      func: test.func
     });
 }
 
@@ -89,6 +89,11 @@ function pause() {
 
 function updateIcon(dom, success) {
   dom.find('.status').addClass(success ? 'status-success' : 'status-fail');
+  const passed = $('#test-list .status.status-success').length;
+  const failed = $('#test-list .status.status-fail').length;
+  $('.report-amount-run').text(passed + failed);
+  $('.report-amount-passed').text(passed);
+  $('.report-amount-failed').text(failed);
 }
 
 function findTestCaseById(id) {
diff --git a/web/test/suites.js b/web/test/suites.js
index ef4a4737..d0cec092 100644
--- a/web/test/suites.js
+++ b/web/test/suites.js
@@ -32,7 +32,10 @@ export default {
 
 function TestCase(name) {
   let tests = require('./cases/' + name).default;
-  tests = Object.keys(tests).filter(key => key.startsWith('test')).map(key => tests[key]);
+  tests = Object.keys(tests).filter(key => key.startsWith('test')).map(key => ({
+    name: key,
+    func: tests[key]
+  }));
   return {
     name, tests
   }
diff --git a/web/test/utils/deep-merge.js b/web/test/utils/deep-merge.js
new file mode 100644
index 00000000..e76f8c4d
--- /dev/null
+++ b/web/test/utils/deep-merge.js
@@ -0,0 +1,26 @@
+export function isObject(item) {
+  return (item && typeof item === 'object' && !Array.isArray(item));
+}
+
+/**
+ * Deep merge two objects.
+ * @param target
+ * @param ...sources
+ */
+export function deepMerge(target, ...sources) {
+  if (!sources.length) return target;
+  const source = sources.shift();
+
+  if (isObject(target) && isObject(source)) {
+    for (let key in source) {
+      if (isObject(source[key])) {
+        if (!target[key]) Object.assign(target, { [key]: {} });
+        deepMerge(target[key], source[key]);
+      } else {
+        Object.assign(target, { [key]: source[key] });
+      }
+    }
+  }
+
+  return deepMerge(target, ...sources);
+}
\ No newline at end of file
diff --git a/webpack.config.js b/webpack.config.js
index 3170b0a2..9ecc4e80 100644
--- a/webpack.config.js
+++ b/webpack.config.js
@@ -32,6 +32,10 @@ module.exports = {
     {
       test: /\.html$/,
       loader: 'handlebars?helperDirs[]=' + __dirname + '/web/app/ui/helpers'
+    },
+    {
+      test: /\.json$/,
+      loader: 'json'      
     }]
   }
 };