In compositor image previews inside nodes don't update/refresh when they should #78586

New Issue

Tomasz Kaye · 2020-07-03T21:16:17+02:00

Tomasz Kaye commented

2020-07-03 21:16:17 +02:00

System Information
Operating system: Darwin-19.5.0-x86_64-i386-64bit 64 Bits
Graphics card: NVIDIA GeForce GT 650M OpenGL Engine NVIDIA Corporation 4.1 NVIDIA-14.0.32 355.11.11.10.10.143

Blender Version
Broken: version: 2.90.0 Alpha, branch: master, commit date: 2020-07-02 22:21, hash: 5a13f682ee

Short description of error
In compositor image previews inside nodes don't update/refresh when they should

Exact steps for others to reproduce the error

Open the attached .blend file
No renders or previews show up in the compositor panel despite Auto Render being turned on, I expected this option to trigger a render if one doesn't yet exist.
Press f12 to render.
Back in the compositor panel, the backdrop image now shows, but there are no preview images inside the nodes - I expected there to be at this point.
Clicking the material icon on the Render Layers node causes the previews to appear in the other two nodes. Clicking a second time expands the Render Layers node showing the image preview there too.

compositingbug.blend

**System Information** Operating system: Darwin-19.5.0-x86_64-i386-64bit 64 Bits Graphics card: NVIDIA GeForce GT 650M OpenGL Engine NVIDIA Corporation 4.1 NVIDIA-14.0.32 355.11.11.10.10.143 **Blender Version** Broken: version: 2.90.0 Alpha, branch: master, commit date: 2020-07-02 22:21, hash: `5a13f682ee` **Short description of error** In compositor image previews inside nodes don't update/refresh when they should **Exact steps for others to reproduce the error** * Open the attached .blend file * No renders or previews show up in the compositor panel despite Auto Render being turned on, I expected this option to trigger a render if one doesn't yet exist. * Press f12 to render. * Back in the compositor panel, the backdrop image now shows, but there are no preview images inside the nodes - I expected there to be at this point. * Clicking the material icon on the Render Layers node causes the previews to appear in the other two nodes. Clicking a second time expands the Render Layers node showing the image preview there too. [compositingbug.blend](https://archive.blender.org/developer/F8662094/compositingbug.blend)

Tomasz Kaye commented

2020-07-03 21:16:17 +02:00

Added subscriber: @info-27

Germano Cavalcante commented

2020-07-07 16:50:09 +02:00

Added subscriber: @mano-wii

Germano Cavalcante commented

2020-07-07 16:50:09 +02:00

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

Germano Cavalcante commented

2020-07-07 16:50:09 +02:00

I didn't understand this step:

No renders or previews show up in the compositor panel despite Auto Render being turned on, I expected this option to trigger a render if one doesn't yet exist.

But I can confirm that the render image does not appear automatically inside the node after it is rendered.

I didn't understand this step: > No renders or previews show up in the compositor panel despite Auto Render being turned on, I expected this option to trigger a render if one doesn't yet exist. But I can confirm that the render image does not appear automatically inside the node after it is rendered.

Tomasz Kaye commented

2020-07-07 16:54:15 +02:00

i don't know if that part belongs in the bug report, but:

From the label 'Auto render' i expected that turning this on would force a render to be calculated if there wasn't one currently available to display in the nodes that required one (as well as rendering again anytime the scene changed). But it doesn't seem to behave this way. Opening the file and turning auto-render on doesn't seem to trigger a render to be started.

i don't know if that part belongs in the bug report, but: From the label 'Auto render' i expected that turning this on would force a render to be calculated if there wasn't one currently available to display in the nodes that required one (as well as rendering again anytime the scene changed). But it doesn't seem to behave this way. Opening the file and turning auto-render on doesn't seem to trigger a render to be started.

Germano Cavalcante commented

2020-07-07 17:03:01 +02:00

This appears to be a different bug.
Only one bug per report is allowed (unless they are closely related).

This appears to be a different bug. Only one bug per report is allowed (unless they are closely related).

Evan Wilson commented

2020-07-07 20:08:33 +02:00

Added subscriber: @EAW

Evan Wilson commented

2020-07-07 20:08:33 +02:00

6f0aca7973 possibly related. @info-27, is this the first time you tried to use this feature, or did it work before and now it doesn’t?

6f0aca7973 possibly related. @info-27, is this the first time you tried to use this feature, or did it work before and now it doesn’t?

Tomasz Kaye commented

2020-07-08 10:41:44 +02:00

@EAW yes, this is my first time using the compositor.

Tomasz Kaye commented

2020-07-08 15:29:06 +02:00

A simpler example. With this setup in the compositor the viewer node doesn't display the colour.

A simpler example. With this setup in the compositor the viewer node doesn't display the colour. ![image.png](https://archive.blender.org/developer/F8678241/image.png)

blender-admin commented

2020-07-10 11:37:51 +02:00

This issue was referenced by 83f01db7a9

This issue was referenced by 83f01db7a96c6e86b22b1b28e9873b1c18f0a66a

Sergey Sharybin commented

2020-07-10 11:42:27 +02:00

Added subscriber: @Sergey

Sergey Sharybin self-assigned this 2020-07-10 11:42:27 +02:00

Sergey Sharybin commented

2020-07-10 11:42:27 +02:00

Auto-render only works on scene edits.
The code explicitly avoids any compositing operations after file open, because otherwise opening production files will cause unavoidable slowdown upon open.

There is a fix for preview of color input proposed in D8263.

Auto-render only works on scene edits. The code explicitly avoids any compositing operations after file open, because otherwise opening production files will cause unavoidable slowdown upon open. There is a fix for preview of color input proposed in [D8263](https://archive.blender.org/developer/D8263).

Sergey Sharybin commented

2020-07-29 17:19:14 +02:00

Changed status from 'Confirmed' to: 'Resolved'

Sergey Sharybin closed this issue

2020-07-29 17:19:14 +02:00

Thomas Dinges added this to the 2.90 milestone 2023-02-08 16:26:17 +01:00

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In compositor image previews inside nodes don't update/refresh when they should #78586