I can only use 4 UDIM textures
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Description

System Information
Operating system: Windows-10-10.0.18362-SP0 64 Bits
Graphics card: GeForce GTX 970/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 388.13

Blender Version
Broken: version: 2.82 (sub 6), branch: master, commit date: 2020-01-14 23:08, hash: rB3edd8d5b075a
Worked: (optional)

Short description of error
In a material only 4 UDIM Textures work. The 5th UDIM cause error.

Box Test.zip43 MBDownload

Exact steps for others to reproduce the error

Please unzip the attached file .
Open attached blend file.
The box is pink ( error due to 5 UDIM texture)
Please remove any UDIM texture in shader window. No error.
So, I think blender can only handle maximum 4 UDIM textures.

Thanks you.

Revisions and Commits

rB Blender
	D6456	rB7d8a18633540 Fix T73133: UDIM texture count in Eevee is limited by OpenGL

Related Objects

Mentioned In: D6456: Use 2D texture arrays for UDIM drawing in Eevee to avoid texture limit
Mentioned Here: D6456: Use 2D texture arrays for UDIM drawing in Eevee to avoid texture limit

Event Timeline

Thura Thein Tin (ThuraTT) created this task.Jan 15 2020, 12:40 PM

I am getting:

GPUShader: error: too many samplers in shader.

The max number reported for me (nvidia 970m) is:

GPU_max_textures 192

Afaics, there are 5 UDIM textures (with 5 2048px x 2048px tiles each) in place here.
Not sure how/if these are split up internally here.

@Clément Foucault (fclem), @Lukas Stockner (lukasstockner97) : why are we reaching the limit with this shader?

This is a limitation @Lukas Stockner (lukasstockner97) is planning to lift with some patch. Should be included for final release.

The reason is because eevee also use many samplers on its own before using user textures. Also you should look at GPU_max_textures_frag which is around 24 on high end hardware.

@Clément Foucault (fclem): thx for clarification, it is this patch D6456: Use 2D texture arrays for UDIM drawing in Eevee to avoid texture limit

Philipp Oeser (lichtwerk) added a revision: D6456: Use 2D texture arrays for UDIM drawing in Eevee to avoid texture limit.Jan 15 2020, 5:25 PM

Philipp Oeser (lichtwerk) mentioned this in D6456: Use 2D texture arrays for UDIM drawing in Eevee to avoid texture limit.Jan 15 2020, 5:28 PM