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Pink background color sometimes in eevee
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Description

System Information
Operating system: Windows-8.1-6.3.9600 64 Bits
Graphics card: Intel(R) HD Graphics 4600 Intel 4.3.0 - Build 10.18.14.5067

Blender Version
Broken: version: 2.80 (sub 75), branch: master, commit date: 2019-07-29 14:47, hash: rBf6cb5f54494e
Worked: (optional)

Short description of error
Sometimes it renders a pink background.

Exact steps for others to reproduce the error
Open blender, change to "shading workspace". In the cube's material I add a voronoi texture (I tried with wave or noise and it happens too) and a "color ramp" to the color of the default "principled shader"
I move ONLY the sliders or the interpolation of the "color ramp" and render with f12, default eevee. Sometimes the final render render is gray, sometimes is pink.
Everithig is the dafault scene except the "voronoi texture" and the "color ramp"

Details

Type
Bug

Event Timeline

Jacques Lucke (JacquesLucke) triaged this task as Needs Information from User priority.

I cannot reproduce the issue. When I open the file and render it, there is no pink.

Can you check that your driver is up to date?
Also, when I open the file, the pattern on the cube looks quite different.

Hello. I have an Intel program that checks for drivers and it says everithing is up to date.

the pattern on the cube is different because I saved the file once with that pattern BUT then I play with the sliders of the color ramp, the pattern changes every time i move the sliders and in some of the renders there is a pink colour and in other renders there is not the pink colour. It does not afect if there is a lot or black or white over the cube.

I had a lot of problems with the betas of the new 2.8 (it seems that Intel(R) HD Graphics 4600 Intel 4.3.0 is a pain) and I still have some of that betas that worked.

I opened the same blend file in this beta: "blender-2.80.0-git.411b5f3b100e-windows64" and I have taken more than 20 renders of the cube playing with the sliders, all of the renders have weird shadow edges and are darker but NONE of them is pink.

I hope I have explained it well, English is not my native language. Thank you very much for your interest.

Hello everybody.

I have found something interesting: the problem is not related with the "color ramp" because I rendered the default file (default cube with default material) and after a couple of renders (with the viewport in solid mode or look dev mode) the render is pink again, and then if I switch the viewport to "render preview" it is pink too.

BUT if I restart blender and open a file (I can use the default file, my file or any other file) and immediately switch the viewport to "render preview" this preview is normal now and, after this, if I render the file several times (I have done more than 20 with the viewport in any mode) the "pink problem" never happens again during the session.
All of this happens with eevee.

It seems like switching the viewport to "render preview" just after opening a file activates "something in eevee" that fixes the "pink problem"

Thank you very much.

This maybe due to texture garbage collection.. try changing the related timings in the preference panel to verify this.

I have changed the values of Blender Preferences > System > Memory & Limits "Texture Time Out" and "Garbage Collection rate" I have tried lower and higher values (I have tried it opening the default cube) and get always theese two results:

1- If I open blender, hit f12 to render the default cube. I get a "light grey" render of the cube.


after this "normal" render if I switch the viewport to "render preview" I get this pink preview.

If i render it more times the renders are sometimes "light grey" sometimes pink, the pink preview remains.

2- If I open blender, switch the viewport to "render preview", then there is no pink preview there. I hit f12 to render the default cube. and I get a "dark grey" render of the cube. if i render it more times the renders are all "dark grey" Everything seems OK, no pink at all.

The only diference between "light grey" and "dark grey" is switching the viewport to "render preview" before the first render. I dont know which one is the correct.

Thank you.