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https://github.com/xibyte/jsketcher
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640 lines
18 KiB
JavaScript
640 lines
18 KiB
JavaScript
import Vector from 'math/vector';
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import * as cad_utils from '../../cad-utils'
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import * as math from '../../../../../modules/math/commons'
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import {HashTable} from '../../../utils/hashmap'
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import {Mesh} from '../mesh'
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import revolve from './revolve'
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import {Triangulate} from '../../tess/triangulation'
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export function sortPolygons(polygons) {
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function Loop(polygon) {
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this.polygon = polygon;
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this.nesting = [];
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this.level = 0;
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}
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function contains(polygon, other) {
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for (let point of other._2D) {
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if (!math.isPointInsidePolygon(point, polygon._2D)) {
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return false;
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}
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}
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return true;
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}
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const loops = polygons.map(p => new Loop(p));
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for (let i = 0; i < loops.length; ++i) {
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const loop = loops[i];
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for (let j = 0; j < loops.length; ++j) {
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if (i == j) continue;
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const other = loops[j];
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if (contains(loop.polygon, other.polygon)) {
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loop.nesting.push(other);
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other.level ++;
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}
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}
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}
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const allShells = [];
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function collect(level) {
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const shells = loops.filter(l => l.level == level);
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if (shells.length == 0) {
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return;
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}
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for (let shell of shells) {
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shell.nesting = shell.nesting.filter(l => l.level == level + 1);
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allShells.push(shell);
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}
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collect(level + 2);
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}
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collect(0);
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return allShells;
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}
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function extrudeNestedLoops(sketchedPolygons, normal, target, expansionFactor) {
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const loops = sortPolygons(sketchedPolygons);
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const doExtrude = (polygon) => {
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const extruded = cad_utils.extrude(polygon, normal, target, expansionFactor);
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return CSG.fromPolygons(_triangulateCSG(extruded));
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};
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let blob = null;
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for (let loop of loops) {
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let shell = doExtrude(loop.polygon);
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for (let nestedLoop of loop.nesting) {
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const hole = doExtrude(nestedLoop.polygon);
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shell = shell.subtract(hole);
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}
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if (blob === null) {
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blob = shell;
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} else {
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blob = blob.union(shell);
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}
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}
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return blob;
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}
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export function extrude(app, request) {
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const face = request.face;
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const sketchedPolygons = getSketchedPolygons3D(app, face);
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if (sketchedPolygons == null) return null;
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const normal = cad_utils.vec(face.csgGroup.plane.normal);
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let blob = extrudeNestedLoops(sketchedPolygons, normal, request.params.target, request.params.expansionFactor);
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let solid = request.solids[0];
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if (solid.mergeable) {
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blob = solid.csg.union(blob);
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}
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face.csgGroup.shared.__tcad.faceId += '$';
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return [cad_utils.createSolid(blob, solid.id)];
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}
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export function cut(app, request) {
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const face = request.face;
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const sketchedPolygons = getSketchedPolygons3D(app, face);
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if (sketchedPolygons == null) return null;
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const normal = cad_utils.vec(face.csgGroup.plane.normal);
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let cutter = extrudeNestedLoops(sketchedPolygons, normal, request.params.target, request.params.expansionFactor);
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face.csgGroup.shared.__tcad.faceId += '$';
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var outSolids = [];
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for (var si = 0; si < request.solids.length; si++) {
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let solid = request.solids[si];
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let work = solid.csg;
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let cut = work.subtract(cutter);
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let solidMesh = cad_utils.createSolid(cut, solid.id);
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outSolids.push(solidMesh);
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}
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return outSolids;
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}
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export function performRevolve(app, request) {
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const face = request.face;
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const sketchedPolygons = getSketchedPolygons3D(app, face);
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if (sketchedPolygons == null) return null;
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const params = request.params;
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const vertices = face.getSketchObjectVerticesIn3D(params.pivotSketchObjectId);
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if (!vertices) {
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return null;
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}
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const axis = [vertices[0], vertices[vertices.length-1]];
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const revolved = revolve(sketchedPolygons, axis, params.angle / 180 * Math.PI, params.resolution);
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const solid = request.solids[0];
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let meld = CSG.fromPolygons(_triangulateCSG(revolved));
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if (solid.mergeable) {
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meld = solid.csg.union(meld);
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}
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face.csgGroup.shared.__tcad.faceId += '$';
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return [cad_utils.createSolid(meld, solid.id)];
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}
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function _pointOnLine(p, a, b) {
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var ab = a.minus(b);
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var ap = a.minus(p);
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var dp = ab.dot(ap);
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var abLength = ab.length();
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var apLength = ap.length();
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return apLength > 0 && apLength < abLength && math.areEqual(abLength * apLength, dp, 1E-6);
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}
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export function polygonsToSegments(polygons) {
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function selfIntersecting(a, b, c) {
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var f = _pointOnLine;
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return f(c, a, b) || f(a, b, c) || f(b, c, a);
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}
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//polygons.filter(function(p) {
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//
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//});
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//magnitude of cross product is the area of parallelogram
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//var area = points[b].pos.minus(points[a].pos).cross(points[c].pos.minus(points[a].pos)).length() / 2.0;
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//if (selfIntersecting(points[a].pos, points[b].pos, points[c].pos)) {
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//continue;
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//}
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var segmentsByPolygon = [];
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for (var pi = 0; pi < polygons.length; pi++) {
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var segments = [];
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var poly = polygons[pi];
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var p, q, n = poly.vertices.length;
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for(p = n - 1, q = 0; q < n; p = q ++) {
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var a = poly.vertices[p];
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var b = poly.vertices[q];
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segments.push([a.pos, b.pos]);
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}
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segmentsByPolygon.push(segments);
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}
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return segmentsByPolygon;
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}
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export function reconstructSketchBounds(csg, face, strict) {
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strict = strict || false;
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var polygons = csg.toPolygons();
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var plane = face.csgGroup.plane;
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var outerEdges = [];
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var planePolygons = [];
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for (var pi = 0; pi < polygons.length; pi++) {
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var poly = polygons[pi];
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if (math.equal(poly.plane.normal.dot(plane.normal), 1)) {
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if (math.equal(plane.w, poly.plane.w) && (!strict || !!poly.shared.__tcad && poly.shared.__tcad.faceId === face.id)) {
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planePolygons.push(poly);
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}
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continue;
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}
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var p, q, n = poly.vertices.length;
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for(p = n - 1, q = 0; q < n; p = q ++) {
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var a = poly.vertices[p];
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var b = poly.vertices[q];
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var pointAOnPlane = math.equal(plane.signedDistanceToPoint(a.pos), 0);
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if (!pointAOnPlane) continue;
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var pointBOnPlane = math.equal(plane.signedDistanceToPoint(b.pos), 0);
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if (pointBOnPlane) {
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outerEdges.push([a.pos, b.pos, poly]);
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}
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}
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}
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var outline = findOutline(planePolygons);
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pickUpCraftInfo(outline, outerEdges);
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return segmentsToPaths(outline).map(poly => poly.vertices);
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}
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function pickUpCraftInfo(outline, outerEdges) {
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var eq = math.strictEqual;
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for (var psi1 = 0; psi1 < outline.length; psi1++) {
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var s1 = outline[psi1];
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for (var psi2 = 0; psi2 < outerEdges.length; psi2++) {
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var s2 = outerEdges[psi2];
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if (math.equal(Math.abs(s1[0].minus(s1[1]).unit().dot(s2[0].minus(s2[1]).unit())), 1) &&
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(eq(s1[0], s2[0]) || eq(s1[1], s2[1]) || eq(s1[0], s2[1]) || eq(s1[1], s2[0]) ||
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_pointOnLine(s1[0], s2[0], s2[1]) || _pointOnLine(s1[1], s2[0], s2[1]))) {
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s1[2] = s2[2];
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}
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}
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}
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}
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function getOutlineByCollision(segments, outerEdges) {
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var eq = math.strictEqual;
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var outline = [];
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for (var psi1 = 0; psi1 < segments.length; psi1++) {
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var s1 = segments[psi1];
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for (var psi2 = 0; psi2 < outerEdges.length; psi2++) {
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var s2 = outerEdges[psi2];
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if (math.equal(Math.abs(s1[0].minus(s1[1]).unit().dot(s2[0].minus(s2[1]).unit())), 1) &&
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(eq(s1[0], s2[0]) || eq(s1[1], s2[1]) || eq(s1[0], s2[1]) || eq(s1[1], s2[0]) ||
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_pointOnLine(s1[0], s2[0], s2[1]) || _pointOnLine(s1[1], s2[0], s2[1]))) {
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outline.push(s1);
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}
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}
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}
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return outline;
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}
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export function findOutline (planePolygons) {
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var segmentsByPolygon = polygonsToSegments(planePolygons);
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//simplifySegments(segmentsByPolygon);
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var planeSegments = cad_utils.arrFlatten1L(segmentsByPolygon);
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//planeSegments = removeSharedEdges(planeSegments);
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removeTJoints(planeSegments);
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planeSegments = removeSharedEdges(planeSegments);
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return planeSegments;
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}
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function removeSharedEdges(segments) {
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segments = segments.slice();
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var eq = math.strictEqual;
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for (var psi1 = 0; psi1 < segments.length; psi1++) {
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var s1 = segments[psi1];
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if (s1 == null) continue;
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for (var psi2 = 0; psi2 < segments.length; psi2++) {
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if (psi1 === psi2) continue;
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var s2 = segments[psi2];
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if (s2 == null) continue;
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if ((eq(s1[0], s2[0]) && eq(s1[1], s2[1]) || (eq(s1[0], s2[1]) && eq(s1[1], s2[0])))) {
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segments[psi1] = null;
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segments[psi2] = null;
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}
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}
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}
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return segments.filter(function(e) {return e !== null});
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}
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function simplifySegments(polygonToSegments) {
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for (var pi1 = 0; pi1 < polygonToSegments.length; ++pi1) {
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for (var pi2 = 0; pi2 < polygonToSegments.length; ++pi2) {
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if (pi1 === pi2) continue;
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var polygon1 = polygonToSegments[pi1];
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var polygon2 = polygonToSegments[pi2];
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for (var si1 = 0; si1 < polygon1.length; ++si1) {
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var seg1 = polygon1[si1];
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for (var si2 = 0; si2 < polygon2.length; ++si2) {
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var point = polygon2[si2][0];
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if (_pointOnLine(point, seg1[0], seg1[1])) {
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polygon1.push([point, seg1[1]]);
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seg1[1] = point;
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}
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}
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}
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}
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}
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}
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function _closeFactorToLine(p, seg1, seg2) {
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var a = p.minus(seg1);
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var b = seg2.minus(seg1);
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var bn = b.unit();
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var projLength = bn.dot(a);
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var bx = bn.times(projLength);
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if (!(projLength > 0 && projLength < b.length())) {
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return -1;
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}
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var c = a.minus(bx);
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return c.length();
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}
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function removeTJoints(segments) {
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var pointIndex = HashTable.forVector3d();
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for (var i = 0; i < segments.length; ++i) {
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pointIndex.put(segments[i][0], 1);
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pointIndex.put(segments[i][1], 1);
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}
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var points = pointIndex.getKeys();
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var eq = math.strictEqual;
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for (var pi1 = 0; pi1 < points.length; ++pi1) {
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var point = points[pi1];
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var best = null, bestFactor;
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for (var pi2 = 0; pi2 < segments.length; ++pi2) {
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var seg = segments[pi2];
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if (eq(seg[0], point) || eq(seg[1], point)) continue;
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var factor = _closeFactorToLine(point, seg[0], seg[1]);
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if (factor != -1 && factor < 1E-6 && (best == null || factor < bestFactor)) {
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best = seg;
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bestFactor = factor;
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}
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}
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if (best != null) {
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segments.push([point, best[1]]);
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best[1] = point;
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}
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}
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}
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function deleteRedundantPoints(path) {
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var cleanedPath = [];
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//Delete redundant point
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var pathLength = path.length;
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var skipMode = false;
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for (var pi = 0; pi < pathLength; pi++) {
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var bIdx = ((pi + 1) % pathLength);
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var a = path[pi];
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var b = path[bIdx];
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var c = path[(pi + 2) % pathLength];
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var eq = math.areEqual;
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if (!skipMode) cleanedPath.push(a);
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skipMode = eq(a.minus(b).unit().dot(b.minus(c).unit()), 1, 1E-9);
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}
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return cleanedPath;
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}
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export function segmentsToPaths(segments) {
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var veq = math.strictEqual;
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var paths = [];
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var index = HashTable.forVector3d();
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var csgIndex = HashTable.forEdge();
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function indexPoint(p, edge) {
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var edges = index.get(p);
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if (edges === null) {
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edges = [];
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index.put(p, edges);
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}
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edges.push(edge);
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}
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for (var si = 0; si < segments.length; si++) {
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var k = segments[si];
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indexPoint(k[0], k);
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indexPoint(k[1], k);
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var csgInfo = k[2];
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if (csgInfo !== undefined && csgInfo !== null) {
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csgIndex.put([k[0], k[1]], csgInfo);
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}
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k[3] = false;
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}
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function nextPoint(p) {
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var edges = index.get(p);
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if (edges === null) return null;
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for (var i = 0; i < edges.length; i++) {
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var edge = edges[i];
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if (edge[3]) continue;
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var res = null;
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if (veq(p, edge[0])) res = edge[1];
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if (veq(p, edge[1])) res = edge[0];
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if (res != null) {
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edge[3] = true;
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return res;
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}
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}
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return null;
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}
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var path;
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for (var ei = 0; ei < segments.length; ei++) {
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var edge = segments[ei];
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if (edge[3]) {
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continue;
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}
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edge[3] = true;
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path = [edge[0], edge[1]];
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paths.push(path);
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var next = nextPoint(edge[1]);
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while (next !== null) {
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if (!veq(next, path[0])) {
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path.push(next);
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next = nextPoint(next);
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} else {
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next = null;
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}
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}
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}
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var filteredPaths = [];
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for (var i = 0; i < paths.length; i++) {
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path = paths[i];
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//Set derived from object to be able to recunstruct
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cad_utils.iteratePath(path, 0, function (a, b) {
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var fromPolygon = csgIndex.get([a, b]);
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if (fromPolygon !== null) {
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if (fromPolygon.shared.__tcad.csgInfo) {
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a.sketchConnectionObject = fromPolygon.shared.__tcad.csgInfo.derivedFrom;
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}
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}
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return true;
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});
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path = deleteRedundantPoints(path);
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if (path.length > 2) {
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filteredPaths.push({
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vertices: path
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});
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}
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}
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return filteredPaths;
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}
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function _triangulateCSG(polygons) {
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function csgVert(data) {
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return new CSG.Vertex(new CSG.Vector3D(data[0], data[1], data[2]));
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}
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function data(v) {
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return [v.x, v.y, v.z];
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}
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var triangled = [];
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for (let poly of polygons) {
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let vertices = Triangulate([poly.vertices.map(v => data(v.pos))], data(poly.plane.normal));
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for (let i = 0; i < vertices.length; i += 3 ) {
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var a = csgVert(vertices[i]);
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var b = csgVert(vertices[i + 1]);
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var c = csgVert(vertices[i + 2]);
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var csgPoly = new CSG.Polygon([a, b, c], poly.shared, poly.plane);
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triangled.push(csgPoly);
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}
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}
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return triangled;
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}
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function splitTwoSegments(a, b) {
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var da = a[1].minus(a[0]);
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var db = b[1].minus(b[0]);
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var dc = b[0].minus(a[0]);
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var daXdb = da.cross(db);
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if (Math.abs(dc.dot(daXdb)) > 1e-6) {
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// lines are not coplanar
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return null;
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}
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var veq = math.strictEqual;
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if (veq(a[0], b[0]) || veq(a[0], b[1]) || veq(a[1], b[0]) || veq(a[1], b[1])) {
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return null;
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}
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var dcXdb = dc.cross(db);
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function _split(s, ip) {
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if (s[0].equals(ip) || s[1].equals(ip)) {
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return [s];
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}
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return [[s[0], ip, s[2]], [ip, s[1], s[2]]]
|
|
}
|
|
var s = dcXdb.dot(daXdb) / daXdb.lengthSquared();
|
|
if (s > 0.0 && s < 1.0) {
|
|
var ip = a[0].plus(da.times(s));
|
|
return {
|
|
splitterParts : _split(a, ip),
|
|
residual : _split(b, ip)
|
|
}
|
|
}
|
|
return null;
|
|
}
|
|
|
|
function attract(vectors, precision) {
|
|
var eq = math.areEqual();
|
|
var dist = math.distanceAB3;
|
|
vectors = vectors.slice();
|
|
for (var i = 0; i < vectors.length; i++) {
|
|
var v1 = vectors[i];
|
|
if (v1 == null) continue;
|
|
for (var j = i + 1; j < vectors.length; j++) {
|
|
var v2 = vectors[j];
|
|
if (v2 == null) continue;
|
|
if (dist(v1, v2) <= precision) {
|
|
Vector.prototype.setV.call(v2, v1);
|
|
vectors[j] = null;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
function recoverySketchInfo(polygons) {
|
|
var nonStructuralGons = [];
|
|
var sketchEdges = HashTable.forDoubleArray();
|
|
function key(a, b) {return [a.x, a.y, b.x, b.y]}
|
|
|
|
for (var pi = 0; pi < polygons.length; pi++) {
|
|
var poly = polygons[pi];
|
|
var paths = [];
|
|
poly.collectPaths(paths);
|
|
var i, path, n, p, q;
|
|
for (i = 0; i < paths.length; i++) {
|
|
path = paths[i];
|
|
if (poly.csgInfo !== undefined && poly.csgInfo.derivedFrom !== undefined) {
|
|
n = path.length;
|
|
for (p = n - 1, q = 0; q < n ; p = q++ ) {
|
|
sketchEdges.put(key(path[p], path[q]), poly.csgInfo);
|
|
}
|
|
} else {
|
|
nonStructuralGons.push(path);
|
|
}
|
|
}
|
|
}
|
|
|
|
for (i = 0; i < nonStructuralGons.length; i++) {
|
|
path = nonStructuralGons[i];
|
|
n = path.length;
|
|
for (p = n - 1, q = 0; q < n ; p = q++ ) {
|
|
var csgInfo = sketchEdges.get(key(path[p], path[q]));
|
|
if (csgInfo === null) {
|
|
csgInfo = sketchEdges.get(key(path[q], path[p]));
|
|
}
|
|
if (csgInfo) {
|
|
path[p].sketchConnectionObject = csgInfo.derivedFrom;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
function detach(request) {
|
|
var detachedConfig = {};
|
|
for (var prop in request) {
|
|
if (request.hasOwnProperty(prop)) {
|
|
var value = request[prop];
|
|
if (prop == 'solids') {
|
|
detachedConfig[prop] = value.map(function(s){return s.tCadId});
|
|
} else if (prop == 'face') {
|
|
detachedConfig[prop] = value.id;
|
|
} else if (prop == 'target') {
|
|
detachedConfig[prop] = [value.x, value.y, value.z];
|
|
} else if (prop == 'basis') {
|
|
detachedConfig[prop] = value.map(function(v){return [v.x, v.y, v.z]});
|
|
} else if (prop == 'params') {
|
|
detachedConfig[prop] = detach(value);
|
|
} else {
|
|
detachedConfig[prop] = value;
|
|
}
|
|
}
|
|
}
|
|
return detachedConfig
|
|
}
|
|
|
|
function materialize(index, detachedConfig) {
|
|
var request = {};
|
|
function required(value) {
|
|
if (value == null || value == undefined) throw "value is required";
|
|
return value;
|
|
}
|
|
for (var prop in detachedConfig) {
|
|
if (detachedConfig.hasOwnProperty(prop)) {
|
|
var value = detachedConfig[prop];
|
|
if (prop == 'solids') {
|
|
request[prop] = value.map(function(id){return required(index.solids[id])});
|
|
} else if (prop == 'target') {
|
|
request[prop] = new Vector().set3(value);
|
|
} else if (prop == 'face') {
|
|
request[prop] = required(index.faces[value]);
|
|
} else if (prop == 'basis') {
|
|
request[prop] = value.map(function(v) {return new Vector().set3(v)});
|
|
} else if (prop == 'params') {
|
|
request[prop] = materialize(index, value);
|
|
} else {
|
|
request[prop] = value;
|
|
}
|
|
}
|
|
}
|
|
return request;
|
|
}
|
|
|
|
export const MESH_OPERATIONS = {
|
|
CUT : cut,
|
|
EXTRUDE : extrude,
|
|
REVOLVE : performRevolve,
|
|
PLANE : function(app, request) {
|
|
let basis, depth = request.params.depth;
|
|
const relativeToFaceId = request.params.relativeToFaceId;
|
|
if (relativeToFaceId != undefined && relativeToFaceId != '') {
|
|
const face = app.findFace(relativeToFaceId);
|
|
if (!face) return;
|
|
basis = face.basis();
|
|
depth += face.depth();
|
|
} else {
|
|
basis = request.params.basis;
|
|
}
|
|
return [cad_utils.createPlane(basis, depth)];
|
|
},
|
|
BOX : function(app, request) {
|
|
var p = request.params;
|
|
return [cad_utils.createCSGBox(p.w, p.h, p.d)];
|
|
},
|
|
SPHERE : function(app, request) {
|
|
return [cad_utils.createSphere(request.params.radius)];
|
|
},
|
|
IMPORT_STL: function(app, request) {
|
|
return request.params.objects.map(s => {
|
|
const smoothAngle = 1 / 180 * Math.PI;
|
|
const mesh = Mesh.fromPolygons(s.faces.map(f => f.vertices.map(v => new Vector().set3(v))), smoothAngle);
|
|
const polygons = [];
|
|
for (let meshFace of mesh.faces) {
|
|
const pl = meshFace.polygons[0];
|
|
const plane = new CSG.Plane(pl.normal.csg(), pl.w);
|
|
const shared = cad_utils.createShared();
|
|
meshFace.polygons.map(p => new CSG.Polygon(p.points.map(v => new CSG.Vertex(v.csg())), shared, plane))
|
|
.forEach(p => polygons.push(p));
|
|
}
|
|
return cad_utils.createSolid(CSG.fromPolygons(polygons));
|
|
});
|
|
}
|
|
};
|