public DifferentialGeometry(Point P, Vector DPDU, Vector DPDV, Normal DNDU, Normal DNDV, float uu, float vv, Shape sh)
{
p = (P);
dpdu = (DPDU);
dpdv = (DPDV);
dndu = (DNDU);
dndv = (DNDV);
nn = new Normal(Vector.Normalize(Vector.Cross(dpdu, dpdv)));
u = uu;
v = vv;
shape = sh;
dudx = dvdx = dudy = dvdy = 0;
dpdx = dpdy = new Vector();
if (shape != null && (shape.ReverseOrientation ^ shape.TransformSwapsHandedness))
nn *= -1.0f;
}
public void Setshape(Shape s)
{
shape = s;
}
