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Poser - OFFICIAL F.A.Q (Last Updated: 2024 Nov 18 10:25 pm)



Subject: begone foul Spots!


Khai ( ) posted Wed, 19 September 2007 at 11:52 PM · edited Tue, 19 November 2024 at 9:27 AM

file_388498.png

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...


Khai ( ) posted Thu, 20 September 2007 at 7:38 AM

file_388525.jpg

here's what I mean

no reflection node on the skin, raytraced shadows:


Khai ( ) posted Thu, 20 September 2007 at 7:38 AM

file_388526.jpg

now, same shot, reflection node on the skin, set to .2 value, quality 1.


SamTherapy ( ) posted Thu, 20 September 2007 at 7:46 AM

It's a problem Ziggie noticed some time ago, if the Reflect node is causing it.  Adjust your Reflect node to the following:

Quality 0.1
Bias 2.0

That should cure it.

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Khai ( ) posted Thu, 20 September 2007 at 9:34 AM

aha! thank you... thats much better now...


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