View Full Version : PrMan ptfilter diffusemeanfreepath

10 October 2005, 05:13 AM
Has anyone experimented much with putting in different rgb triplets into the PrMan ptfilter utility used to generate subsurface diffusion point clouds? I started by keeping r, g, and, b the same, eaning that al three wavelengths scattered equally through the material. What I'd like to create is the effect I've seen in snow, where the scattered light tends to be blue-ish. When I get a nice scattering blue I like, the diffusely reflecting component is much too red. I thought that reducing the mean free path of the red channel would mean more of the red would get absorbed. It looks more like I'm getting more reflected red light while the scattering light is turnign blue.

Wwhat I'd like is white diffusely reflecting parts and a blue scattering component.

10 October 2005, 06:47 PM
Are you putting any color information into the point cloud that you are baking out? Or is it just a grayscale representing the SSS contribution.

If you make it a grayscale you can always bring it in to your shader and filter it with a color (or several colors) using all kinds of available techniques.


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10 October 2005, 06:48 PM
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