public override bool Intersect(Ray r, Intersection isect)
{
Transform w2p;
WorldToPrimitive.Interpolate(r.time, out w2p);
Ray ray = w2p.Apply(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 = Transform.Inverse isect.WorldToObject.Inverse(
// 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;
}
public override bool Intersect(Ray r, Intersection isect)
{
double thit, rayEpsilon;
if (!shape.Intersect(r, out thit, out rayEpsilon, out isect.dg))
return false;
isect.primitive = this;
isect.WorldToObject = shape.WorldToObject;
isect.ObjectToWorld = shape.ObjectToWorld;
isect.shapeId = shape.shapeId;
isect.primitiveId = primitiveId;
isect.rayEpsilon = rayEpsilon;
r.maxt = thit;
return true;
}
public abstract bool Intersect(Ray r, Intersection isect);
