Compositor Active During Incomplete Render in Viewports #116554

New Issue

philovivero · 2023-12-26T14:43:17+01:00

philovivero commented

2023-12-26 14:43:17 +01:00

System Information
Operating system: macOS-13.6.1-arm64-arm-64bit 64 Bits
Graphics card: Metal API Apple M2 Ultra 1.2

Blender Version
Broken: version: 4.0.2, branch: blender-v4.0-release, commit date: 2023-12-05 07:41, hash: 9be62e85b727
Worked: I'm not sure this ever "worked" differently than it does now, but as it is implemented, it's a major performance hit.

Short description of error
In viewport, while rendering is still incomplete, compositor is applied at every iteration of the render.

Exact steps for others to reproduce the error

In 3D viewport, go to rendered mode
Click the render settings button in upper right of 3D viewport
Choose compositor "always"
Move around your scene, see how compositor applies before render is complete

I'll include a .blend that demonstrates the problem and a short video as well. In the video you can see how when I'm moving around the 3D viewport, the compositor is applying from the very first iteration of Cycles. Same thing happens in Eevee, though I do not demonstrate that here. Then, at the end of the video, I do an actual render, where you can see the scene goes through its iterations until done, then and only then is the compositor node tree applied.

This is not bad in the included scene, but in any complex scene, having the compositor during every iteration of the render slows it down dramatically.

I could see someone wanting the compositor before render is complete, but can we at least have the option to follow the same workflow as actual render, such that compositor is only applied after render is complete?

**System Information** Operating system: macOS-13.6.1-arm64-arm-64bit 64 Bits Graphics card: Metal API Apple M2 Ultra 1.2 **Blender Version** Broken: version: 4.0.2, branch: blender-v4.0-release, commit date: 2023-12-05 07:41, hash: `9be62e85b727` Worked: I'm not sure this ever "worked" differently than it does now, but as it is implemented, it's a major performance hit. **Short description of error** In viewport, while rendering is still incomplete, compositor is applied at every iteration of the render. **Exact steps for others to reproduce the error** 1. In 3D viewport, go to rendered mode 2. Click the render settings button in upper right of 3D viewport 3. Choose compositor "always" 4. Move around your scene, see how compositor applies before render is complete I'll include a .blend that demonstrates the problem and a short video as well. In the video you can see how when I'm moving around the 3D viewport, the compositor is applying from the very first iteration of Cycles. Same thing happens in Eevee, though I do not demonstrate that here. Then, at the end of the video, I do an actual render, where you can see the scene goes through its iterations until done, then and only then is the compositor node tree applied. This is not bad in the included scene, but in any complex scene, having the compositor during every iteration of the render slows it down dramatically. I could see someone wanting the compositor before render is complete, but can we at least have the option to follow the same workflow as actual render, such that compositor is only applied after render is complete?

CompositorWhileRendering.mp4

2.3 MiB

CompositorDuringRender.blend

114 KiB

philovivero added the

labels 2023-12-26 14:43:18 +01:00

Pratik Borhade commented

2023-12-27 06:03:47 +01:00

Hi, thanks for the report. Compositing results after complete render in viewport will make real-time compositor less useful (have to wait minute or two or even more to get compositing results. Then there won't be difference in realtime renders and final render).
The issue reported here is a request for modified/improved behavior and not a bug in current behavior. Closing as this bug tracker is only for bugs and errors.

For user requests and feedback, please use other channels: https://wiki.blender.org/wiki/Communication/Contact#User_Feedback_and_Requests

For more information on why this isn't considered a bug, visit: https://wiki.blender.org/wiki/Reference/Not_a_bug

Hi, thanks for the report. Compositing results after complete render in viewport will make real-time compositor less useful (have to wait minute or two or even more to get compositing results. Then there won't be difference in realtime renders and final render). The issue reported here is a request for modified/improved behavior and not a bug in current behavior. Closing as this bug tracker is only for bugs and errors. For user requests and feedback, please use other channels: https://wiki.blender.org/wiki/Communication/Contact#User_Feedback_and_Requests For more information on why this isn't considered a bug, visit: https://wiki.blender.org/wiki/Reference/Not_a_bug

Pratik Borhade closed this issue

2023-12-27 06:03:50 +01:00

Blender Bot added

and removed

labels 2023-12-27 06:03:51 +01:00

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