Chaos Corona Forum

Chaos Corona for Cinema 4D => [C4D] Bug Reporting => Topic started by: FS-Marc on 2022-11-11, 12:11:43

Title: Interactive Renderer - Shading error when multiplying images with a color
Post by: FS-Marc on 2022-11-11, 12:11:43

Hi,

Ive found that the materials (their reflection mostly) in the IPR turn yellow when lights are moved. This seems to be a bug when multiplying the Texture of the background with a color.

The workaround would be to use a Corona color mix - which works but thats just one more uneccessery step.

Title: Re: Interactive Renderer - Shading error when multiplying images with a color
Post by: Beanzvision on 2022-11-11, 14:23:53

Hi there, if you refresh the IR, is it then okay again? Can you please share a sample scene (if possible) or a video of this happening?

Title: Re: Interactive Renderer - Shading error when multiplying images with a color
Post by: John_Do on 2022-11-11, 16:40:22

Hey, I just want to add that I already had this issue too, not with moving lights but with Rayswitch and Tonemap shaders, they break really fast in IR.

By the way the IR seems to have regressed with v9, I often have to stop and restart it because the framebuffer goes full black sometimes, randomly. Fortunately not at a point where it would unusable but it didn't happen with v8.

Title: Re: Interactive Renderer - Shading error when multiplying images with a color
Post by: Beanzvision on 2022-11-15, 08:30:30

Quote from: FS-Marc on 2022-11-11, 12:11:43

Hi,

Ive found that the materials (their reflection mostly) in the IPR turn yellow when lights are moved. This seems to be a bug when multiplying the Texture of the background with a color.

The workaround would be to use a Corona color mix - which works but thats just one more uneccessery step.

Hi there, are you able to share an example scene with us? I tried to recreate it but failed. Thanks!

Title: Re: Interactive Renderer - Shading error when multiplying images with a color
Post by: FS-Marc on 2022-11-15, 11:37:51

Restarting the IPR (Stop - Start) "fixes" the issue. But as soon as you change anything while the IPR is running the error occurs again (Like moving around the object).

Most basic setup would be the following:

Having one object with a mirror-like texture.
Corona Sky set to Shader/HDRI with a random shader.
Plane with Shadowcatcher material set to Environment with the sky loaded in.
Scene Environment Direct visibility override turned on with a !!Material loaded that has an image loaded in the texture slot in the Base Layer with the mix mode set to Multiply and some not defaulted setting to the Color that is multiplied with.

Sorry but I cant make a screen capture at the moment scine my remote setup blocks the capture. If the instruction didnt help I will send you a video as soon as possible.