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fix nurbs mirroring(left handed coordinate system if working in parametric space)

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This commit is contained in:
xibyte 2018-01-06 22:51:20 -08:00
parent 6dc0c7e2be
commit cbf54794e6
1 changed files with 15 additions and 5 deletions
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20
web/app/brep/geom/impl/nurbs.js
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@ -294,6 +294,14 @@ export class NurbsSurface extends Surface {
this.simpleSurface = simpleSurface || figureOutSimpleSurface(this);
}
domainU() {
return this.verb.domainU();
}
domainV() {
return this.verb.domainV();
}
middle() {
let {min: uMin, max: uMax} = this.verb.domainU();
let {min: vMin, max: vMax} = this.verb.domainV();
@ -370,11 +378,13 @@ export class NurbsSurface extends Surface {
}
static isMirrored(surface) {
//TODO: use domain!
let a = surface.point(0, 0);
let b = surface.point(1, 0);
let c = surface.point(1, 1);
return b.minus(a).cross(c.minus(a))._normalize().dot(surface.normalUV(0, 0)) < 0;
let {min: uMin} = surface.domainU();
let {min: vMin} = surface.domainV();
let x = surface.isoCurveAlignU(uMin).tangentAtParam(uMin);
let y = surface.isoCurveAlignV(vMin).tangentAtParam(vMin);
return x.cross(y).dot(surface.normalUV(uMin, vMin)) < 0;
}
intersectSurfaceForSameClass(other) {