Solidify in Complex mode prevents display of materials assigned to generated geometry #97359

New Issue

Faruk Ahmet · 2022-04-15T18:12:42+02:00

Faruk Ahmet commented

2022-04-15 18:12:42 +02:00

System Information
Operating system: Windows-10-10.0.19042-SP0 64 Bits
Graphics card: NVIDIA GeForce GTX 1660/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 472.84

Blender Version
Broken: version: 3.2.0 Alpha, branch: master, commit date: 2022-04-14 19:51, hash: 48ff456a4b
Worked: N/A

Short description of error
Solidifymodifier in Complexmode prevents showing of materials assigned (via Set Material) to geometry generated inside Geometry Nodes. There are two exceptions I noticed:

Materials do show if you have at least two materials slots on the object. They don't need to be filled, just exist as slots.
Materials do show if you use either a Duplicate Elements or aGeometry to Instance node before Set Material.

Here's a video demoing the situation and the two exceptions:

20220415190922.mp4

Exact steps for others to reproduce the error

In the attached file, create a second material slot; red color should show.
or
In the attached file, link either Duplicate Elementsor Geo to Instance output to the Set Material node; red color should show.

Bug_GN_SolidifyComplex.blend

**System Information** Operating system: Windows-10-10.0.19042-SP0 64 Bits Graphics card: NVIDIA GeForce GTX 1660/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 472.84 **Blender Version** Broken: version: 3.2.0 Alpha, branch: master, commit date: 2022-04-14 19:51, hash: `48ff456a4b` Worked: N/A **Short description of error** *Solidify*modifier in *Complex*mode prevents showing of materials assigned (via *Set Material*) to geometry generated inside Geometry Nodes. There are two exceptions I noticed: - Materials do show if you have at least two materials slots on the object. They don't need to be filled, just exist as slots. - Materials do show if you use either a *Duplicate Elements* or a*Geometry to Instance* node before *Set Material*. Here's a video demoing the situation and the two exceptions: [20220415190922.mp4](https://archive.blender.org/developer/F13002957/20220415190922.mp4) **Exact steps for others to reproduce the error** - In the attached file, create a second material slot; red color should show. or - In the attached file, link either *Duplicate Elements*or *Geo to Instance* output to the *Set Material* node; red color should show. [Bug_GN_SolidifyComplex.blend](https://archive.blender.org/developer/F13002962/Bug_GN_SolidifyComplex.blend)

Faruk Ahmet commented

2022-04-15 18:12:42 +02:00

Added subscriber: @Kuboa

Hans Goudey commented

2022-04-16 00:05:16 +02:00

Added subscriber: @HooglyBoogly

Hans Goudey commented

2022-04-16 00:05:16 +02:00

Thanks for the report.
I looked into this for a few minutes, but didn't really get anywhere in my understanding of the situation.
There are so many factors at play here-- materials stored on objects vs. meshes, handling of material indices, the way different render engines handle those distinctions, etc.

So far I have a suspicion this might be the same problem as #95903 though.

Thanks for the report. I looked into this for a few minutes, but didn't really get anywhere in my understanding of the situation. There are so many factors at play here-- materials stored on objects vs. meshes, handling of material indices, the way different render engines handle those distinctions, etc. So far I have a suspicion this might be the same problem as #95903 though.

Pratik Borhade commented

2022-04-19 07:44:02 +02:00

Added subscriber: @PratikPB2123