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Subject: Shining light on backfacing polygons

ElZagna opened this issue on Mar 10, 2018 · 7 posts

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ElZagna ( ) posted Sat, 10 March 2018 at 7:44 PM · edited Fri, 03 January 2025 at 12:09 AM

When you have an object with backfacing polygons that are visible to the camera, they tend to be dimly lit at best, like this: BackFacingPolys NoIDL 1.png

IDL helps but not enough:

BackFacingPolys IDL 1.png

I found that using the Alternate_Diffuse channel instead of the DIffuse_Color will solve the problem sometimes, but not always. I'm sure there's some principle involved here, and I hope someone can let me know what it is.

OS: Windows 10 64-bit, Poser: 10

seachnasaigh ( ) posted Sat, 10 March 2018 at 8:36 PM

Have you tried ticking the normals forward box in the material root node?

Poser 12, in feet.

OSes: Win7Prox64, Win7Ultx64

Silo Pro 2.5.6 64bit, Vue Infinite 2014.7, Genetica 4.0 Studio, UV Mapper Pro, UV Layout Pro, PhotoImpact X3, GIF Animator 5

ElZagna ( ) posted Sat, 10 March 2018 at 8:59 PM

DOH!!! Dammit! Is that it? One of the things that worked for me in my tests was using a Diffuse node but only if Normals_Forward was checked on it. I hadn't even noticed the root node had a Normals_Forward. So what is Normals_Forward anyway?

OS: Windows 10 64-bit, Poser: 10

SamTherapy ( ) posted Sat, 10 March 2018 at 9:20 PM

ElZagna posted at 3:19AM Sun, 11 March 2018 - #4325890

DOH!!! Dammit! Is that it? One of the things that worked for me in my tests was using a Diffuse node but only if Normals_Forward was checked on it. I hadn't even noticed the root node had a Normals_Forward. So what is Normals_Forward anyway?

Forces all the poly normals to point towards the camera, so they look properly lit.

Coppula eam se non posit acceptera jocularum.

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