public static List<FaceMesh> createFaceMeshes(final TopoDS_Shape topoDS_Shape) {
int meshIter = 3;
TopExp_Explorer explorer = new TopExp_Explorer();
TopLoc_Location loc = new TopLoc_Location();
List<FaceMesh> faceMeshes = new ArrayList<FaceMesh>();
for (explorer.init(topoDS_Shape, TopAbs_ShapeEnum.FACE); explorer.more(); explorer.next()) {
TopoDS_Shape s = explorer.current();
if (!(s instanceof TopoDS_Face)) continue; // should not happen!
TopoDS_Face face = (TopoDS_Face) s;
Poly_Triangulation pt = BRep_Tool.triangulation(face, loc);
float error = 0.001f * getMaxBound(s) * 4;
// float error=0.0001f;
int iter = 0;
while ((pt == null) & (iter < meshIter)) {
new BRepMesh_IncrementalMesh(face, error, false);
// new BRepMesh_IncrementalMesh(face,error, true);
pt = BRep_Tool.triangulation(face, loc);
error /= 10;
iter++;
}
if (pt == null) {
System.err.println(
"Triangulation failed for face " + face + ". Trying other mesh parameters.");
faceMeshes.add(new FaceMesh(new float[0], new int[0]));
continue;
}
double[] dnodes = pt.nodes();
final int[] itriangles = pt.triangles();
if (face.orientation() == TopAbs_Orientation.REVERSED) {
reverseMesh(itriangles);
}
final float[] fnodes = new float[dnodes.length];
if (loc.isIdentity()) {
for (int i = 0; i < dnodes.length; i++) {
fnodes[i] = (float) dnodes[i];
}
} else transformMesh(loc, dnodes, fnodes);
faceMeshes.add(new FaceMesh(fnodes, itriangles));
}
return faceMeshes;
}
public static List<float[]> createEdgeArrays(final TopoDS_Shape topoDS_Shape) {
final List edgeArrays = new ArrayList<float[]>();
TopExp_Explorer explorer = new TopExp_Explorer();
HashSet<TopoDS_Edge> alreadyDone = new HashSet<TopoDS_Edge>();
Bnd_Box box = new Bnd_Box();
BRepBndLib.add(topoDS_Shape, box);
double[] bbox = box.get();
// double[] bbox=computeBoundingBox();
double boundingBoxDeflection =
0.0005 * Math.max(Math.max(bbox[3] - bbox[0], bbox[4] - bbox[1]), bbox[5] - bbox[2]);
for (explorer.init(topoDS_Shape, TopAbs_ShapeEnum.EDGE); explorer.more(); explorer.next()) {
TopoDS_Shape s = explorer.current();
if (!(s instanceof TopoDS_Edge)) continue; // should not happen!
TopoDS_Edge e = (TopoDS_Edge) s;
if (!alreadyDone.add(e)) continue;
double[] range = BRep_Tool.range(e);
Geom_Curve gc = BRep_Tool.curve(e, range);
float[] array;
if (gc != null) {
GeomAdaptor_Curve adaptator = new GeomAdaptor_Curve(gc);
GCPnts_UniformDeflection deflector = new GCPnts_UniformDeflection();
deflector.initialize(adaptator, boundingBoxDeflection, range[0], range[1]);
int npts = deflector.nbPoints();
// Allocate one additional point at each end = parametric value 0, 1
array = new float[(npts + 2) * 3];
int j = 0;
double[] values = adaptator.value(range[0]);
array[j++] = (float) values[0];
array[j++] = (float) values[1];
array[j++] = (float) values[2];
// All intermediary points
for (int i = 0; i < npts; ++i) {
values = adaptator.value(deflector.parameter(i + 1));
array[j++] = (float) values[0];
array[j++] = (float) values[1];
array[j++] = (float) values[2];
}
// Add last point
values = adaptator.value(range[1]);
array[j++] = (float) values[0];
array[j++] = (float) values[1];
array[j++] = (float) values[2];
edgeArrays.add(array);
} else {
if (!BRep_Tool.degenerated(e)) {
// So, there is no curve, and the edge is not degenerated?
// => draw lines between the vertices and ignore curvature
// best approximation we can do
ArrayList<double[]> aa = new ArrayList<double[]>(); // store points here
for (TopExp_Explorer explorer2 = new TopExp_Explorer(s, TopAbs_ShapeEnum.VERTEX);
explorer2.more();
explorer2.next()) {
TopoDS_Shape sv = explorer2.current();
if (!(sv instanceof TopoDS_Vertex)) continue; // should not happen!
TopoDS_Vertex v = (TopoDS_Vertex) sv;
aa.add(BRep_Tool.pnt(v));
}
array = new float[aa.size() * 3];
for (int i = 0, j = 0; i < aa.size(); i++) {
double[] f = aa.get(i);
array[j++] = (float) f[0];
array[j++] = (float) f[1];
array[j++] = (float) f[2];
}
edgeArrays.add(array);
}
}
}
return edgeArrays;
}