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Subject: begone foul Spots!

Khai opened this issue on Sep 19, 2007 · 8 posts

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Khai ( ) posted Wed, 19 September 2007 at 11:52 PM · edited Tue, 19 November 2024 at 9:22 AM

anyone know what causes spots on a model at render time? ....I'm not talking little fuzzy AO spots.. but big whacking ones in regular patterns!

(1 infinate light, IBL with a simple white to black gradient. 1 skydome (blue). Aircraft skin setup with a simple reflection node + texture and bump map. thats it - spots appear with both Raytraced and Mapped Shadows and with no shadows. Normals forward has no effect other than to raise render times. Spots appear with ground on and off. nothing else is in the scene. this is poser 7)

Cage ( ) posted Thu, 20 September 2007 at 12:26 AM

Do those follow the mesh structure in any way? These kind of look like double-sided poly rendering artifacts to me....

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SamTherapy ( ) posted Thu, 20 September 2007 at 6:48 AM

Looks like Polygon self shadowing to me. Try playing about with Shadow Min BIas.

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Khai ( ) posted Thu, 20 September 2007 at 7:01 AM · edited Thu, 20 September 2007 at 7:02 AM

ok it's not double sides... and the shadow min bias does nothing to correct them, (.spots appear with both Raytraced and Mapped Shadows and with no shadows..)
they only appear when you put a reflect node on the texture...