Chaos Corona Forum

Chaos Corona for Cinema 4D => [C4D] I need help! => Topic started by: balu007 on 2023-11-20, 07:42:11

Title: smooth shading
Post by: balu007 on 2023-11-20, 07:42:11
Hello,
please advise how to set the scene/render so that the shading is smooth. I rendered it as a multi-pass and all the layers are "corrupted". Render has a resolution of 7520x4238 px 16 Bits/Channel.

Thank you
Title: Re: smooth shading
Post by: burnin on 2023-11-20, 11:52:20
Check Normals & Phong angels. Know about new tools.
 Best start being, you providing what you've already done yourself, then us advising/upgrading on that.
Title: Re: smooth shading
Post by: davetwo on 2023-11-20, 12:58:19
The questions isnt about ''smooth shading' in that sense. The OP is talking about banding in his render.

What is the colour space that you are outputting to? And how are you getting it into PS? For "proper'' compositing it should ideally be 32bit linear AFAIK.
Title: Re: smooth shading
Post by: burnin on 2023-11-20, 13:14:48
Aha, I see. You're correct, multi-pass output format should be at least 16bpc (tiff, exr, psd).

Also, note that ACES OT clamps final results.
Title: Re: smooth shading
Post by: balu007 on 2023-11-20, 13:25:32
Quote from: davetwo on 2023-11-20, 12:58:19
What is the colour space that you are outputting to? And how are you getting it into PS? For "proper'' compositing it should ideally be 32bit linear AFAIK.

I rendered it as multi-pass PSD 16/bit and the render color profile is Linear Color Space. Unfortunately, I don't know where to set a different color profile in the render settings.
Title: Re: smooth shading
Post by: davetwo on 2023-11-20, 15:21:32
In your photoshop file go to Edit>convert to profile>sRGB. Is the banding still there?

Title: Re: smooth shading
Post by: pokoy on 2023-11-20, 15:47:09
This issue is not because of smoothing/normals.
It is because you are comping the elements in PS in 16bits, which results in too coarse color values, which will inevitably produce banding in dark areas. You have to use 32 bits in PS.

When you save out elements, you need to make sure to use 16 (or 32) bits in an HDR floating point format - for example EXR.

HDR formats can use 16 or 32 bits, both will work for you, just use EXR. HDR formats save values as floating point data which is needed for increased color value accuracy.
Note that this is *not* the same as using 16 bits in LDR formats such as TIF/PNG. These LDR formats use integer values which have limited accuracy. This is what you're seeing - either because you saved elements to a integer LDR format or because you're working in 16 bits mode in PS (or both).
In Photoshop/After Effects, you have to work in 32 bits (it's always linear) mode when comping elements.
Title: Re: smooth shading
Post by: balu007 on 2023-11-21, 10:08:30
OK, so I'll try exporting 32 bits
thank you