/// <summary>
/// Find point-normal frame at ray-intersection point on mesh, or return false if no hit.
/// Returns interpolated vertex-normal frame if available, otherwise tri-normal frame.
/// </summary>
public static bool RayHitPointFrame(DMesh3 mesh, ISpatial spatial, Ray3d ray, out Frame3f hitPosFrame, bool bForceFaceNormal = false)
{
hitPosFrame = new Frame3f();
int tid = spatial.FindNearestHitTriangle(ray);
if (tid == DMesh3.InvalidID)
{
return(false);
}
var isect = TriangleIntersection(mesh, tid, ray);
if (isect.Result != IntersectionResult.Intersects)
{
return(false);
}
Vector3d surfPt = ray.PointAt(isect.RayParameter);
if (mesh.HasVertexNormals && bForceFaceNormal == false)
{
hitPosFrame = SurfaceFrame(mesh, tid, surfPt); // TODO isect has bary-coords already!!
}
else
{
hitPosFrame = new Frame3f(surfPt, mesh.GetTriNormal(tid));
}
return(true);
}
public bool RayIntersect(Ray3d ray, out Vector3d vHit, out Vector3d vHitNormal)
{
vHit = Vector3d.Zero;
vHitNormal = Vector3d.AxisX;
int tHitID = Spatial.FindNearestHitTriangle(ray);
if (tHitID == DMesh3.InvalidID)
{
return(false);
}
IntrRay3Triangle3 t = MeshQueries.TriangleIntersection(Mesh, tHitID, ray);
vHit = ray.PointAt(t.RayParameter);
if (UseFaceNormal == false && Mesh.HasVertexNormals)
{
vHitNormal = Mesh.GetTriBaryNormal(tHitID, t.TriangleBaryCoords.x, t.TriangleBaryCoords.y, t.TriangleBaryCoords.z);
}
else
{
vHitNormal = Mesh.GetTriNormal(tHitID);
}
return(true);
}