Geonode + Cycles displaying of instances that uses GPU subdiv (either rendering unsubdivided, or in combination with Set Material node completely vanishing) #96729

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Patrick · 2022-03-23T14:41:40+01:00

Patrick commented

2022-03-23 14:41:40 +01:00

Operating system: Windows 10
Graphics card: GTX 750 Ti

Broken: Blender 3.1 I still have to try the same setup with other versions

Geonodes instances don't render at all when the instance is a mesh with subdiv on. See the orange outlines.

In the file I joined, the subdivided cube called "Instancer" is instanced on all points of the "Plane". To see the bug/behavior simply check/uncheck the Optimal Display on the instancer Modifier, this seems to reset the visibility, then mute/unmute the SET MATERIAL NODE in the geonode. The instances should dispear, I think the problem lies in the interaction between subdiv modifier and Set material node.

Let me know if I can give more information.

This is the node setup

Here is an example file that reproduces the bug.
instance set material + subdiv bug.blend1

Operating system: Windows 10 Graphics card: GTX 750 Ti Broken: Blender 3.1 I still have to try the same setup with other versions Geonodes instances don't render at all when the instance is a mesh with subdiv on. See the orange outlines. ![image.png](https://archive.blender.org/developer/F12941187/image.png) In the file I joined, the subdivided cube called "Instancer" is instanced on all points of the "Plane". To see the bug/behavior simply check/uncheck the Optimal Display on the instancer Modifier, this seems to reset the visibility, then mute/unmute the SET MATERIAL NODE in the geonode. The instances should dispear, I think the problem lies in the interaction between subdiv modifier and Set material node. Let me know if I can give more information. This is the node setup ![image.png](https://archive.blender.org/developer/F12941185/image.png) Here is an example file that reproduces the bug. [instance set material + subdiv bug.blend1](https://archive.blender.org/developer/F12941191/instance_set_material___subdiv_bug.blend1)

Patrick commented

2022-03-23 14:41:40 +01:00

Added subscriber: @Patnard

Patrick changed title from ~~Geonode + Cycles displaying of instances that uses subdiv~~ to Geonode + Cycles displaying of instances that uses subdiv and set material node

2022-03-23 17:32:01 +01:00

Omar Emara commented

2022-03-24 09:03:54 +01:00

Added subscriber: @OmarEmaraDev

Omar Emara commented

2022-03-24 09:03:54 +01:00

Changed status from 'Needs Triage' to: 'Needs User Info'

Omar Emara commented

2022-03-24 09:03:54 +01:00

I can't replicate this on either 3.1 or master. By "Optimal Display on the instancer Modifier", did you mean the Subivision modifier? If not, which modifier do you mean?
Not sure if this will matter, but I am not testing with GPU subdivision, can you disable that in the preferences and check if it works? Preferences > Viewport > Subdivision > Viewport subdivision.
And does this happen only for Cycles or also for EEVEE?

I can't replicate this on either 3.1 or master. By "Optimal Display on the instancer Modifier", did you mean the Subivision modifier? If not, which modifier do you mean? Not sure if this will matter, but I am not testing with GPU subdivision, can you disable that in the preferences and check if it works? Preferences > Viewport > Subdivision > Viewport subdivision. And does this happen only for Cycles or also for EEVEE?

Patrick commented

2022-03-24 18:58:12 +01:00

I did some testing following you comment and I got 2 things to note.
First, turning off GPU subdivision solves the rendering problem, which was only present on cycle btw. Eevee rendered the mesh.

Second, in eevee, WITH GPU subdivision turned on, the instanced cube render BUT without the subdivision, so as a cube, not a ball.

The issue seems to be with GPU subdivision then.

I did some testing following you comment and I got 2 things to note. First, turning off GPU subdivision solves the rendering problem, which was only present on cycle btw. Eevee rendered the mesh. Second, in eevee, WITH GPU subdivision turned on, the instanced cube render BUT without the subdivision, so as a cube, not a ball. The issue seems to be with GPU subdivision then.

Omar Emara commented

2022-03-24 19:10:10 +01:00

Changed status from 'Needs User Info' to: 'Needs Triage'

Omar Emara commented

2022-03-24 19:10:10 +01:00

Okay. It is good that we narrowed down the issue, but GPU subdivision doesn't work for me, so I will wait for someone who can triage with it enabled.

Philipp Oeser commented

2022-03-25 10:38:24 +01:00

Added subscribers: @kevindietrich, @lichtwerk

Philipp Oeser commented

2022-03-25 10:38:24 +01:00

Changed status from 'Needs Triage' to: 'Confirmed'

Philipp Oeser commented

2022-03-25 10:38:24 +01:00

For me, GPU subdiv not working [meaning it renders a cube, not a ball] for geonode instances in Cycles is already true without the additional Set Material node.
But I can also confirm it completely vanishes in combinationwith the set Material node
It does work with "traditional" instancing though (if Instancer is parented to plane and instancingto vertices is turned ON).

CC @kevindietrich

For me, GPU subdiv not working [meaning it renders a cube, not a ball] for geonode instances in Cycles is already true without the additional Set Material node. But I can also confirm it completely vanishes in combinationwith the set Material node It does work with "traditional" instancing though (if Instancer is parented to plane and instancingto vertices is turned ON). CC @kevindietrich

Philipp Oeser changed title from ~~Geonode + Cycles displaying of instances that uses subdiv and set material node~~ to Geonode + Cycles displaying of instances that uses GPU subdiv (either rendering unsubdivided, or in combination with Set Material node completely vanishing)

2022-03-25 10:39:52 +01:00

Philipp Oeser commented

2022-03-25 15:00:28 +01:00

Actually, I also consider this High priority.