k3d/share/shaders/k3d_planetclouds.sl:71:  point Pdistortion;		/* "distortion" vector */
k3d/share/shaders/k3d_planetclouds.sl:80:  Pdistortion = distortionscale * DNoise(PP);
k3d/share/shaders/k3d_planetclouds.sl:82:  PP = PP + Pdistortion;
