public Vector3d FindNearestAndOffset(Vector3d pos)
{
int tNearestID = Spatial.FindNearestTriangle(pos);
DistPoint3Triangle3 q = MeshQueries.TriangleDistance(Mesh, tNearestID, pos);
Vector3d vHitNormal =
(UseFaceNormal == false && Mesh.HasVertexNormals) ?
Mesh.GetTriBaryNormal(tNearestID, q.TriangleBaryCoords.x, q.TriangleBaryCoords.y, q.TriangleBaryCoords.z)
: Mesh.GetTriNormal(tNearestID);
return(q.TriangleClosest + Distance * vHitNormal);
}
/// <summary>
/// Get point-normal frame on surface of mesh. Assumption is that point lies in tID.
/// returns interpolated vertex-normal frame if available, otherwise tri-normal frame.
/// </summary>
public static Frame3f SurfaceFrame(DMesh3 mesh, int tID, Vector3d point)
{
if (!mesh.IsTriangle(tID))
{
throw new Exception("MeshQueries.SurfaceFrame: triangle " + tID + " does not exist!");
}
Triangle3d tri = new Triangle3d();
mesh.GetTriVertices(tID, ref tri.V0, ref tri.V1, ref tri.V2);
Vector3d bary = tri.BarycentricCoords(point);
point = tri.PointAt(bary);
if (mesh.HasVertexNormals)
{
Vector3d normal = mesh.GetTriBaryNormal(tID, bary.x, bary.y, bary.z);
return(new Frame3f(point, normal));
}
else
{
return(new Frame3f(point, mesh.GetTriNormal(tID)));
}
}