Mentalray alpha texture shadow issue.

malcolm

I have a quad with a texture on it using an alpha channel for transparency I have a directional light casting a raytraced shadow. The shadow from the alpha appears correctly but with a faint outline of the geo as well. I know this is a common problem but for the life of me I can't remember what the fix is for this. I thought I used to fix this by switching shadow type to "segmented" but that makes the shadow disappear complately. Anybody know how to fix this?

ivars

You can add a mib_shadow_transparency node to your shading network.

Connect out_transparency from your texture (if you're using the alpha channel) to the transparency attribute on the mib_shadow_transparency node and connect that node to your Shdow Shader attribute on your shading group node. Make sure the shadow color is set to black.

ivars

Or the easy way would be to just turn off Shadow Attenuation in the material settings :P

malcolm

I'll give this a try on Monday thanks!