Matrix3 plMaxNodeBase::GetVertToLocal(TimeValue t)
{
Matrix3 objectTM;
//
// If animated or we want forced into local space
// still return OTM to fold into vertices
//
if( GetForceLocal() )
{
return GetOTM(t);
}
// otherwise flatten our local to parent into the verts
// note that our parent may have flattened their l2p into
// their v2l as well.
// so
// objectTM = v2l * l2p * parentL2W
// objectTM * Inverse(parentL2W) = v2l * l2p
// objectTM * parentW2L = v2l (w/ l2p folded in)
//
// Objects transformation ObjectTM = OTM * nodeTM
objectTM = GetObjectTM(t);
Matrix3 w2p(true);
if( !GetParentNode()->IsRootNode() )
w2p = GetWorldToParent(t);
Matrix3 v2l = objectTM * w2p;
return v2l;
}
// TransformedPrimitive Method Definitions
bool TransformedPrimitive::Intersect(const Ray &r,
Intersection *isect) const {
Transform w2p;
WorldToPrimitive.Interpolate(r.time, &w2p);
Ray ray = w2p(r);
if (!primitive->Intersect(ray, isect))
return false;
r.maxt = ray.maxt;
isect->primitiveId = primitiveId;
if (!w2p.IsIdentity()) {
// Compute world-to-object transformation for instance
isect->WorldToObject = isect->WorldToObject * w2p;
isect->ObjectToWorld = Inverse(isect->WorldToObject);
// Transform instance's differential geometry to world space
Transform PrimitiveToWorld = Inverse(w2p);
isect->dg.p = PrimitiveToWorld(isect->dg.p);
isect->dg.nn = Normalize(PrimitiveToWorld(isect->dg.nn));
isect->dg.dpdu = PrimitiveToWorld(isect->dg.dpdu);
isect->dg.dpdv = PrimitiveToWorld(isect->dg.dpdv);
isect->dg.dndu = PrimitiveToWorld(isect->dg.dndu);
isect->dg.dndv = PrimitiveToWorld(isect->dg.dndv);
}
return true;
}
Matrix3 plMaxNodeBase::GetLocalToParent(TimeValue t)
{
// l2w = l2p * parentL2W
// l2w * Inverse(parentL2W) = l2p
// l2w * parentW2L = l2p
Matrix3 l2w = GetLocalToWorld(t);
Matrix3 w2p(true);
if( !GetParentNode()->IsRootNode() )
w2p = GetWorldToParent(t);
Matrix3 l2p = l2w * w2p;
return l2p;
}