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UV Multipass not interpreting right into compositor?

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Nicholas Toth
UV Multipass not interpreting right into compositor?
on Dec 29, 2011 at 11:25:02 pm

Struggling here trying to get a functional UV-multipass out of Cinema 4d.

Essentially I'm using two UV plugins, one by maltaannon.com, and one aescripts.com to try to add decals to existing textures in post using a UV multipass. However, when I render out of C4d, something isn't right; and the UVs RGB don't line up.

So after some head scratching and looking back, I realized that Maltaanon attached a UV example map (its a TIFF) in the working files for the pixel bender plugin, so I created a luminance channel and applied the texture map to all objects in my scene, fired out a luminance, and it worked on both his & the option available at aescripts.

My question is, is anyone else having color space issues with UV multipass outputs? Have you cracked the code? Do you know the gamma shift? I'm working in 32 bit float/EXR format and it seems to only work when I apply an EXTERNAL UV color map to all the objects, not use C4D's native UV multipass output. I'm really looking to avoid having to set up an entire other project JUST to do a UV pass.

Hope that made sense.

Nicholas Toth
Freelance Animator
nicholastoth.com


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Adam Trachtenberg
Re: UV Multipass not interpreting right into compositor?
on Dec 30, 2011 at 5:35:41 am

I've used Maltaanon's plugin with Cinema's UV pass with no problems. Never tried it with EXR, though. Could be an issue there. Perhaps try it with HDR or 16 bit tiff and see if that works.


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Nicholas Toth
Re: UV Multipass not interpreting right into compositor?
on Dec 30, 2011 at 6:19:31 pm

Tried the .tiff method, still not working. The differences in the color mapping are pretty drastic; what format were you working with when it was functioning properly? (left is the Maltanaan's Tiff, which works, right is cinema)

I looked in my prefs and I don't see any UV options. Maybe the UV direction isn't facing right? I'm so confused.



Nicholas Toth
Freelance Animator
nicholastoth.com


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Adam Trachtenberg
Re: UV Multipass not interpreting right into compositor?
on Dec 31, 2011 at 5:47:53 am

It looks like the regions and gradient directions are the same -- just using different colors. Why isn't that working for you?


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Nicholas Toth
Re: UV Multipass not interpreting right into compositor?
on Dec 31, 2011 at 4:39:33 pm

Because the textures stick properly; but they're offset/misaligned.

Nicholas Toth
Freelance Animator
nicholastoth.com


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Adam Trachtenberg
Re: UV Multipass not interpreting right into compositor?
on Dec 31, 2011 at 9:36:21 pm

As far as I know you always have to adjust the offset and alignment. I don't think there's any kind of standard UV output that's going to align textures the way you think they should be aligned.


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