Viewer Node from Compositor is not updated in Camera's Background Image #100266

New Issue

ichlubna · 2022-08-07T16:25:10+02:00

ichlubna commented

2022-08-07 16:25:10 +02:00

System Information
Operating system: Arch Linux

Blender Version
Broken: 3.2.2
Worked: never

Short description of error
The viewer node result from compositor is not propagated in the 3D viewport as a camera background image when selected. This might be really useful in many cases. I often use compositor to edit input videos and I want to adjust the 3D scene according to the video. Especially with the grease pencil, there might be a case when the animator wants to draw an animation over an existing one. It is really strange that the option to use the node is there but it's unusable, related to #73188.

Possible problems
Recursion mentioned in #73182. Might be resolved by overriding the order when the node is used in the camera or letting the user change the order somewhere.

Workaround
Export the composited result in a video and then use as a background image or hit F12 after every frame and use the render result in the background image.

Exact steps for others to reproduce the error

Create a setup in compositor that changes over time
Connect the result to Viewer node
Use Viewer node as camera background image in the 3D scene
Move to another frame - no change in the background image

Included the project file with simple texture animation and two workspaces. One with split screen where both compositor and 3D view are visible. When the compositor is hidden, the background image is not changed at all. When it's visible, it's updated but from the previous frame or state. It seems like the camera first takes the compositor result as the background and then the new compositing takes place. Yes, I understand that it's the design of these stages but this is still a trick to somehow make it work, the image does not update at all without the compositor window being active as shown in the second workspace.

viewerNodeInCamera.blend

**System Information** Operating system: Arch Linux **Blender Version** Broken: 3.2.2 Worked: never **Short description of error** The viewer node result from compositor is not propagated in the 3D viewport as a camera background image when selected. This might be really useful in many cases. I often use compositor to edit input videos and I want to adjust the 3D scene according to the video. Especially with the grease pencil, there might be a case when the animator wants to draw an animation over an existing one. It is really strange that the option to use the node is there but it's unusable, related to #73188. **Possible problems** Recursion mentioned in #73182. Might be resolved by overriding the order when the node is used in the camera or letting the user change the order somewhere. **Workaround** Export the composited result in a video and then use as a background image or hit F12 after every frame and use the render result in the background image. **Exact steps for others to reproduce the error** 1. Create a setup in compositor that changes over time 2. Connect the result to Viewer node 3. Use Viewer node as camera background image in the 3D scene 4. Move to another frame - no change in the background image Included the project file with simple texture animation and two workspaces. One with split screen where both compositor and 3D view are visible. When the compositor is hidden, the background image is not changed at all. When it's visible, it's updated but from the previous frame or state. It seems like the camera first takes the compositor result as the background and then the new compositing takes place. Yes, I understand that it's the design of these stages but this is still a trick to somehow make it work, the image does not update at all without the compositor window being active as shown in the second workspace. [viewerNodeInCamera.blend](https://archive.blender.org/developer/F13344245/viewerNodeInCamera.blend)

ichlubna commented

2022-08-07 16:25:10 +02:00

Added subscriber: @ichlubna