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Maniphest T101032

No real time when painting in Texture paint Mode
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Description

System Information
Operating system: macOS-12.5.1-arm64-arm-64bit 64 Bits
Graphics card: Apple M1 Max Apple 4.1 Metal - 76.3

Blender Version
Broken: version: 3.2.2, branch: master, commit date: 2022-08-02 18:15, hash: rBbcfdb14560e7
Worked: (newest version of Blender that worked as expected)

Short description of error
I mixed 2 Principled Shader and created an image texture node as a mask connected to the socket FAC of the Mix Shader Node. I'm not able to see the result in real time in Shading Viewport/ Render and Shading Viewport/Material Preview only in Shading Viewport/Solid

Exact steps for others to reproduce the error
Steps

Start Blender

  • Simple cube
  • Added first Principled BSDF Shader and connected with Node Wrangler - Maps: Color, Roughness and Normal (A)
  • Added second Principled BSDF Shader and connected with Node Wrangler - Maps: Color, Roughness and Normal (B)
  • Mixed these 2 Principled with mix shader (C)
  • Created a texture - image texture - New - 2048x2048px put the color socket in the FAC of mix Shader node (C)
  • Switched from Object Mode to Texture Paint, tried to paint but in Viewport Shading/Rendered and in Viewport Shading/Material Preview changes were not updated and not visible
  • If I go to Viewport Shading/Solid I see where I painted and when I switch to Viewport/Render I see the mask applied correctly
  • The issue is I do not see the instantly masks when I paint but I have to switch from Shading/Rendered to Shading/Solid and then again to Shading/Rendered to see the mask applied correctly

To see the result of the mask I must switch to Viewport Shading/ Solid and get back to Viewport Shading Render

Thanks

Related Objects

Event Timeline

Piergiorgio (Piergiorgio_PG) created this task.Sep 13 2022, 2:48 PM
Omar Emara (OmarSquircleArt) changed the task status from Needs Triage to Needs Information from User.Sep 13 2022, 3:05 PM
Omar Emara (OmarSquircleArt) added a subscriber: Omar Emara (OmarSquircleArt).

I can't seem to replicate this issue using the following setup. Should I have done something differently?

Piergiorgio (Piergiorgio_PG) added a comment.Sep 13 2022, 3:17 PM

If you go in Viewport Shading/Render and try to paint you won't b able to see the final result in real time, I mean it seems that nothing happens in Viewport Shading/Render. But if you switch in Viewport Shading/Solid and get back to Viewport Shading/Render you'll see the updated paint. Hope this is clear :)

Omar Emara (OmarSquircleArt) added a comment.Sep 13 2022, 3:18 PM

Thanks. I tried that, but it seems to work correctly in my case. Can you attach your file in case my file is different somehow?

Piergiorgio (Piergiorgio_PG) added a comment.Sep 13 2022, 3:25 PM

Blender_Issue_Paint.zip236 KBDownload

I'm not able to see the result of painting in Viewport Shading/Render. I must switch to Viewport Shading/Solid and get back to Viewport Shading/Render

Omar Emara (OmarSquircleArt) added a comment.Sep 13 2022, 3:33 PM

Ah, I see you are using Cycles. This is a known limitation in Cycles. See T86787.

Omar Emara (OmarSquircleArt) closed this task as a duplicate of T86787: Texture Painting not updating cycles shader in viewport.Sep 13 2022, 3:33 PM