public override bool PreciseIntersect(ref SSRay worldSpaceRay, ref float distanceAlongRay)
{
SSRay localRay = worldSpaceRay.Transformed(this.worldMat.Inverted());
SSAbstractMesh mesh = this._mesh;
bool hit = false;
float localNearestContact = float.MaxValue;
if (mesh == null)
{
return(true); // no mesh to test
}
else
{
// precise meshIntersect
bool global_hit = mesh.TraverseTriangles((state, V1, V2, V3) => {
float contact;
if (OpenTKHelper.TriangleRayIntersectionTest(V1, V2, V3, localRay.pos, localRay.dir, out contact))
{
hit = true;
localNearestContact = Math.Min(localNearestContact, contact);
Console.WriteLine("Triangle Hit @ {0} : Object {1}", contact, Name);
}
return(false); // don't short circuit
});
if (hit)
{
float worldSpaceContactDistance = -localNearestContact * this.Scale.LengthFast;
Console.WriteLine("Nearest Triangle Hit @ {0} vs Sphere {1} : Object {2}", worldSpaceContactDistance, distanceAlongRay, Name);
distanceAlongRay = worldSpaceContactDistance;
}
return(global_hit || hit);
}
}
//---------------------
public override bool preciseIntersect(ref SSRay localRay, out float nearestLocalRayContact)
{
nearestLocalRayContact = float.PositiveInfinity;
if (useBVHForIntersections)
{
if (_bvh == null && _vbo != null && _ibo != null)
{
// rebuilding BVH
// TODO try updating instead of rebuilding?
_bvh = new SSIndexedMeshTrianglesBVH(_vbo, _ibo);
for (UInt16 triIdx = 0; triIdx < _ibo.numIndices / 3; ++triIdx)
{
_bvh.addObject(triIdx);
}
}
if (_bvh != null)
{
List <ssBVHNode <UInt16> > nodesHit = _bvh.traverseRay(localRay);
foreach (var node in nodesHit)
{
if (!node.IsLeaf)
{
continue;
}
foreach (UInt16 triIdx in node.gobjects)
{
Vector3 v0, v1, v2;
_readTriangleVertices(triIdx, out v0, out v1, out v2);
float contact;
if (OpenTKHelper.TriangleRayIntersectionTest(
ref v0, ref v1, ref v2, ref localRay.pos, ref localRay.dir, out contact))
{
if (contact < nearestLocalRayContact)
{
nearestLocalRayContact = contact;
}
}
}
}
}
}
else
{
_bvh = null;
// slow, tedious intersection test
int numTri = lastAssignedIndices.Length / 3;
for (UInt16 triIdx = 0; triIdx < numTri; ++triIdx)
{
Vector3 v0, v1, v2;
_readTriangleVertices(triIdx, out v0, out v1, out v2);
float contact;
if (OpenTKHelper.TriangleRayIntersectionTest(
ref v0, ref v1, ref v2, ref localRay.pos, ref localRay.dir, out contact))
{
if (contact < nearestLocalRayContact)
{
nearestLocalRayContact = contact;
}
}
}
}
return(nearestLocalRayContact < float.PositiveInfinity);
}
