Dark bars interior cycles renderings with M1 GPU and light tree #108011

New Issue

Closed

opened 2023-05-17 14:13:20 +02:00 by stereoview · 4 comments

stereoview commented

2023-05-17 14:13:20 +02:00

System Information
Operating system: MacOS Ventura 13.3.1 (a) (22E772610a)
Graphics card: Apple M1

Blender Version
Broken: (3.5.0 also 3.6.0 alpha May 17, 06:04:17 e27cb91442, Apple Silicon)

Short description of error
A repeated horizontal dark bar is drawn in interior renderings. Looks like a half transparent stripe pattern. It is tile size specific and scaled to size of the render tiles. See rendered examples. I tend to say the top 15-20% of a tile is darker than the rest.

Exact steps for others to reproduce the error
The error occurs only when using M1 GPU and activated Light Tree.
When using M1 CPU rendering the error is gone as well as when using M1 GPU with deactivated Light Tree.
I get it only in interior scenes. If there is open sky I was not able to see any flaws.

The scene is quite simple just nishita sky texture, sun and some light portals but a lot of faces.

**System Information** Operating system: MacOS Ventura 13.3.1 (a) (22E772610a) Graphics card: Apple M1 **Blender Version** Broken: (3.5.0 also 3.6.0 alpha May 17, 06:04:17 e27cb91442dc, Apple Silicon) **Short description of error** A repeated horizontal dark bar is drawn in interior renderings. Looks like a half transparent stripe pattern. It is tile size specific and scaled to size of the render tiles. See rendered examples. I tend to say the top 15-20% of a tile is darker than the rest. **Exact steps for others to reproduce the error** The error occurs only when using M1 GPU and activated Light Tree. When using M1 CPU rendering the error is gone as well as when using M1 GPU with deactivated Light Tree. I get it only in interior scenes. If there is open sky I was not able to see any flaws. ![Error Bars.jpg](/attachments/95659941-2466-4a92-8bf9-855c7b86095e) The scene is quite simple just nishita sky texture, sun and some light portals but a lot of faces.

Error Bars.jpg

624 KiB

stereoview added the

labels 2023-05-17 14:13:21 +02:00

YimingWu added the

labels 2023-05-18 07:16:36 +02:00

stereoview commented

2023-05-18 22:27:48 +02:00

Author

Looks like it is some kind of a cache thing on the local machine.

I noticed the stripes are not present anymore when deactivating the sun.
Furthermore its specific only for a certain sun position.
a) It's present at 11.50 time (via sun position add-on).
b) Changing the sun position e.g. to < 11.49 or > 11.51 there are no stripes.
c) Changing back to 11.50 the stripes are visible again.
When coping the packed blender file to my second Mac and rendering it, they're no stripe pattern visible. Not at 11.50 or anything else.

So it looks like there is something locally stored / cached causing the stripes. I can reload the blender file on my first Mac again and again: the stripe pattern is every time visible. On my second Mac same settings it's not.

Looks like it is some kind of a cache thing on the local machine. - I noticed the stripes are not present anymore when deactivating the sun. - Furthermore its specific only for a certain sun position. a) It's present at 11.50 time (via sun position add-on). b) Changing the sun position e.g. to < 11.49 or > 11.51 there are no stripes. c) Changing back to 11.50 the stripes are visible again. - When coping the packed blender file to my second Mac and rendering it, they're no stripe pattern visible. Not at 11.50 or anything else. So it looks like there is something locally stored / cached causing the stripes. I can reload the blender file on my first Mac again and again: the stripe pattern is every time visible. On my second Mac same settings it's not.

Iliya Katushenock added the

Render & Cycles

label 2023-05-18 22:28:50 +02:00

Pratik Borhade commented

2023-05-31 05:54:05 +02:00

Member

So it looks like there is something locally stored / cached causing the stripes

Not very familiar with mac systems. @mano-wii , can you check?

> So it looks like there is something locally stored / cached causing the stripes Not very familiar with mac systems. @mano-wii , can you check?

Germano Cavalcante commented

2023-06-01 16:23:25 +02:00

Member

I'm not sure what's going on and what is meant by "something locally stored / cached".

I've seen similar but older issues involving mixed CPU+GPU rendering where the GPU was done with OpenCL.
By chance, in the preferences, did you mark both options in Metal?

Note that for the report to be fully triaged (and forwarded to the Cycles team), we first need to replicate the issue. Could you provide a simplified .blend file where we can visualize the problem?

I'm not sure what's going on and what is meant by "something locally stored / cached". I've seen similar but older issues involving mixed CPU+GPU rendering where the GPU was done with OpenCL. By chance, in the preferences, did you mark both options in Metal? Note that for the report to be fully triaged (and forwarded to the `Cycles` team), we first need to replicate the issue. Could you provide a simplified .blend file where we can visualize the problem?

Germano Cavalcante added

Needs Information from User

and removed

labels 2023-06-01 16:23:44 +02:00

Pratik Borhade commented

2023-06-23 07:13:22 +02:00

Member

No activity for more than a week. As per the tracker policy we assume the issue is gone and can be closed.

Thanks again for the report. If the problem persists please open a new report with the required information.

No activity for more than a week. As per the tracker policy we assume the issue is gone and can be closed. Thanks again for the report. If the problem persists please open a new report with the required information.

Pratik Borhade closed this issue

2023-06-23 07:13:24 +02:00

Blender Bot added

and removed

Needs Information from User

labels 2023-06-23 07:13:26 +02:00

Sign in to join this conversation.

No Label

Animation & Rigging

Asset Browser Project Overview

Automated Testing

Blender Asset Bundle

Dependency Graph

Development Management

EEVEE & Viewport

Images & Movies

Motion Tracking

Nodes & Physics

Pipeline, Assets & IO

Platforms, Builds & Tests

Render & Cycles

Render Pipeline

Sculpt, Paint & Texture

Video Sequencer

Virtual Reality

Blender 2.8 Project

Milestone 1: Basic, Local Asset Browser

Good First Issue

Animation & Rigging

Development Management

EEVEE & Viewport

Nodes & Physics

Pipeline, Assets & IO

Platforms, Builds & Tests

Render & Cycles

Sculpt, Paint & Texture

Needs Info from Developers

Needs Information from User

No Milestone

No project

No Assignees

3 Participants

Notifications

Due Date

The due date is invalid or out of range. Please use the format 'yyyy-mm-dd'.

No due date set.

Dependencies

No dependencies set.

Reference: blender/blender#108011

No description provided.