k3d/share/shaders/k3d_contacshadow.sl:29:    uniform matrix matNP;  
k3d/share/shaders/k3d_contacshadow.sl:30:    textureinfo(shadowname, "projectionmatrix", matNP);  
k3d/share/shaders/k3d_contacshadow.sl:34:    point screenP = transform(matNP, P);  
