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I tried https://github.com/th0ma5w/rosettamesh but it's unfortunately not working from hemesh to toxi (the hemesh packages changed). Since I don't know clojure (yet) and I'm in a hurry, I wrote this. Maybe it's wrong, inefficient, or it's been written already 100 times :)
import java.util.Iterator;
import java.util.List;
import toxi.geom.Vec3D;
import toxi.geom.mesh.TriangleMesh;
import wblut.hemesh.HE_Face;
import wblut.hemesh.HE_Mesh;
import wblut.hemesh.HE_Vertex;
TriangleMesh hemesh2toxi(HE_Mesh m) {
m.triangulate();
TriangleMesh tmesh = new TriangleMesh("obj", m.numberOfVertices(),
m.numberOfFaces());
Iterator<HE_Face> fItr = m.fItr();
HE_Face f;
while (fItr.hasNext()) {
f = fItr.next();
List<HE_Vertex> v = f.getFaceVertices();
tmesh.addFace(
new Vec3D(v.get(0).xf(), v.get(0).yf(), v.get(0).zf()),
new Vec3D(v.get(1).xf(), v.get(1).yf(), v.get(1).zf()),
new Vec3D(v.get(2).xf(), v.get(2).yf(), v.get(2).zf()));
}
return tmesh;
}