Collection instances (Hair particle system, geometry nodes) visible when set to "Indirect Only" on view layer on OptiX Cycles #89801

New Issue

Samuli Vuorinen · 2021-07-11T19:52:55+02:00

Samuli Vuorinen commented

2021-07-11 19:52:55 +02:00

System Information
Operating system: Windows 10.0.19043 Build 19043
Graphics card: NVIDIA GeForce RTX 3070, driver version 471.11

Blender Version
Broken: 2.93.1, I also tested the daily 2.93.2 build 9e64fd461a

Short description of error
If you have an object covered in a hair particle system in a collection, and you set the rendering mode of that collection to Indirect Only, you can still randomly see the particles directly when rendering with Cycles and OptiX. The visibility varies from render tile to render tile. The emitter object does not show up randomly like the particles do.

Below is an example scene rendered with OptiX. The cube and icosphere are the particle emitter objects that exist in different collections, and the Suzanne monkey heads are the particles. The collection containing the icosphere is set to Indirect Only mode. Thus the monkey particles on the right should be hidden from direct rendering, but appear randomly.

Here is the same scene rendered with CUDA, and it works as expected.

Weirdly, hiding the cube also hides the randomly appearing monkey heads on the icosphere.

Exact steps for others to reproduce the error

Open the attached blend file
Make sure you have OptiX selected as the rendering device in preferences
Press F12 to render
Change rendering device to CUDA and render again for comparison

optix_bug.blend

Here is the system info file from Blender. system-info.txt

From #89707:

When a collection is set to Indirect Only, and thus should not be directly visible, geometry generated by Geometry Nodes inside said collection ignores the setting and appears as visible.

the incorrect behavior, with Geometry Nodes enabled.

the correct behavior, when the view layer visibility of Geometry Nodes is disabled

Exact steps for others to reproduce the error

Apply a geometry node modifier to an object.
Place said object in a collection.
From the Outliner, set the aforementioned collection as "Indirect Only".
Observe the incorrect behavior.

A simple .blend file is attached, which clearly shows what is happening.
I've tested this on both Blender 3.0.0 and Blender 2.93.1. In both cases, the error appears.

buggeo.blend
system-info.txt

**System Information** Operating system: Windows 10.0.19043 Build 19043 Graphics card: NVIDIA GeForce RTX 3070, driver version 471.11 **Blender Version** Broken: 2.93.1, I also tested the daily 2.93.2 build 9e64fd461ac3 **Short description of error** If you have an object covered in a hair particle system in a collection, and you set the rendering mode of that collection to Indirect Only, you can still randomly see the particles directly when rendering with Cycles and OptiX. The visibility varies from render tile to render tile. The emitter object does not show up randomly like the particles do. Below is an example scene rendered with OptiX. The cube and icosphere are the particle emitter objects that exist in different collections, and the Suzanne monkey heads are the particles. The collection containing the icosphere is set to Indirect Only mode. Thus the monkey particles on the right should be hidden from direct rendering, but appear randomly. ![suzanne_optix.png](https://archive.blender.org/developer/F10220672/suzanne_optix.png) Here is the same scene rendered with CUDA, and it works as expected. ![suzanne_cuda.png](https://archive.blender.org/developer/F10220670/suzanne_cuda.png) Weirdly, hiding the cube also hides the randomly appearing monkey heads on the icosphere. **Exact steps for others to reproduce the error** 1. Open the attached blend file 2. Make sure you have OptiX selected as the rendering device in preferences 3. Press F12 to render 4. Change rendering device to CUDA and render again for comparison [optix_bug.blend](https://archive.blender.org/developer/F10220674/optix_bug.blend) Here is the system info file from Blender. [system-info.txt](https://archive.blender.org/developer/F10220684/system-info.txt) --- From #89707: When a collection is set to Indirect Only, and thus should not be directly visible, geometry generated by Geometry Nodes inside said collection ignores the setting and appears as visible. ![Screenshot_20210707_122205.png](https://archive.blender.org/developer/F10215873/Screenshot_20210707_122205.png) *the incorrect behavior, with Geometry Nodes enabled.* ![Screenshot_20210707_122217.png](https://archive.blender.org/developer/F10215877/Screenshot_20210707_122217.png) *the correct behavior, when the view layer visibility of Geometry Nodes is disabled* **Exact steps for others to reproduce the error** 1. Apply a geometry node modifier to an object. 2. Place said object in a collection. 3. From the Outliner, set the aforementioned collection as "Indirect Only". 4. Observe the incorrect behavior. A simple .blend file is attached, which clearly shows what is happening. I've tested this on both Blender 3.0.0 and Blender 2.93.1. In both cases, the error appears. [buggeo.blend](https://archive.blender.org/developer/F10215889/buggeo.blend) [system-info.txt](https://archive.blender.org/developer/F10215896/system-info.txt)

Samuli Vuorinen commented

2021-07-11 19:52:55 +02:00

Added subscriber: @SamuliVuorinen

blender-admin commented

2021-07-11 19:52:55 +02:00

#89707 was marked as duplicate of this issue

Philipp Oeser commented

2021-07-30 14:17:05 +02:00

Added subscribers: @pmoursnv, @lichtwerk

Philipp Oeser commented

2021-07-30 14:17:05 +02:00

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

Philipp Oeser commented

2021-07-30 14:17:06 +02:00

Can confirm.

CC @pmoursnv

Can confirm. CC @pmoursnv

Philipp Oeser changed title from ~~Hair particle system partially visible when set to indirect rendering on view layer on OptiX Cycles~~ to Collection instances (Hair particle system, geometry nodes) visible when set to "Indirect Only" on view layer on OptiX Cycles

2021-09-06 13:21:56 +02:00

Philipp Oeser commented

2021-09-06 13:22:56 +02:00

Added subscribers: @scopelma, @PratikPB2123