Viewer Node does not initialize from within Compositor node group #102240

New Issue

Eliot Mack · 2022-11-03T01:30:04+01:00

Eliot Mack commented

2022-11-03 01:30:04 +01:00

System Information
Operating system: Windows 10 x64
Graphics card: RTX 8000

Blender Version
Broken: 10/26/2022 build

Short description of error

Viewer node does not work if used for the very first time inside a compositor node group. Once the user goes back to the top level composite and connects a Viewer Node, it works, and then updates normally when going back into node groups.

Reproduce from a file

viewerNodeNotWorkingInNodeGroup.blend

Add a viewer node for the Image node output.
Notice how the backdrop and the Viewer image doesn't get initialize with the viewer content.
Go back to the top level node tree and add a viewer node.
Notice how the viewer is initialized.
Go back inside the node group.
Notice how it updates correctly, so it is only for the first time.

Reproduce from scratch

New General file
Hit 0 and F12 to render one frame of the default cube
Change to Composite tab
Change top view to Image Editor
Pick dropdown and select Viewer Node
In compositor panel Shift-A to add a greenscreen image
Shift-A to add a Keyer node
PIck a green color to key it
Add Scale node, set to Fit and Render Size
Connect Keyer Image output to Scale node
Add Alpha Over node. Connect Render Layers to Alpha Over Background input and Scale node to Foreground input
Select Image, Keying, Scale, and Alpha Over nodes.
Ctrl-G to Group
Make sure Node Wrangler is enabled.
Inside the group. select the Image node.
Ctrl-Shift-LMB to add a Viewer and connect it
Note that Viewer Node display in Image Editor does not update.
Press Tab to go up one level.
Highlight Render Layers and press Ctrl-Shift-LMB. Now render layer is shown in Viewer Node.
Highlight Node Group and press Tab to go in.
Now image viewer is working and active.

**System Information** Operating system: Windows 10 x64 Graphics card: RTX 8000 **Blender Version** Broken: 10/26/2022 build **Short description of error** Viewer node does not work if used for the very first time inside a compositor node group. Once the user goes back to the top level composite and connects a Viewer Node, it works, and then updates normally when going back into node groups. **Reproduce from a file** [viewerNodeNotWorkingInNodeGroup.blend](https://archive.blender.org/developer/F13955796/viewerNodeNotWorkingInNodeGroup.blend) - Add a viewer node for the Image node output. - Notice how the backdrop and the Viewer image doesn't get initialize with the viewer content. - Go back to the top level node tree and add a viewer node. - Notice how the viewer is initialized. - Go back inside the node group. - Notice how it updates correctly, so it is only for the first time. **Reproduce from scratch** - New General file - Hit 0 and F12 to render one frame of the default cube - Change to Composite tab - Change top view to Image Editor - Pick dropdown and select Viewer Node - In compositor panel Shift-A to add a greenscreen image - Shift-A to add a Keyer node - PIck a green color to key it - Add Scale node, set to Fit and Render Size - Connect Keyer Image output to Scale node - Add Alpha Over node. Connect Render Layers to Alpha Over Background input and Scale node to Foreground input - Select Image, Keying, Scale, and Alpha Over nodes. - Ctrl-G to Group - Make sure Node Wrangler is enabled. - Inside the group. select the Image node. - Ctrl-Shift-LMB to add a Viewer and connect it - Note that Viewer Node display in Image Editor does not update. - Press Tab to go up one level. - Highlight Render Layers and press Ctrl-Shift-LMB. Now render layer is shown in Viewer Node. - Highlight Node Group and press Tab to go in. - Now image viewer is working and active.

Eliot Mack commented

2022-11-03 01:30:04 +01:00

Added subscriber: @Eliot-Mack

Omar Emara commented

2022-11-11 14:39:04 +01:00

Added subscriber: @OmarEmaraDev

Omar Emara commented

2022-11-11 14:39:04 +01:00

Changed status from 'Needs Triage' to: 'Needs User Info'

Omar Emara commented

2022-11-11 14:39:04 +01:00

Does this still happen in the latest daily version? https://builder.blender.org/download/daily/
Maybe 8ef092d2d8 fixed it.

Does this still happen in the latest daily version? https://builder.blender.org/download/daily/ Maybe 8ef092d2d8 fixed it.

Eliot Mack commented

2022-11-11 17:27:07 +01:00

Yes, the behavior with the CPU compositor & Viewer Node not initializing is still there in today's daily build. (Thanks for the O shortcut fix for the Viewport compositor!)

I notice that the Viewer node is square when I first connect it to a node inside a node group. It only gets the aspect ratio of the rendered comp after it's connected to the top level Render Layers, at which point it's somehow initialized.

This bug isn't a showstopper. I'd prefer to get the rest of the nodes ported to the Viewport Compositor. The update speed is everything.

Yes, the behavior with the CPU compositor & Viewer Node not initializing is still there in today's daily build. (Thanks for the O shortcut fix for the Viewport compositor!) I notice that the Viewer node is square when I first connect it to a node inside a node group. It only gets the aspect ratio of the rendered comp after it's connected to the top level Render Layers, at which point it's somehow initialized. This bug isn't a showstopper. I'd prefer to get the rest of the nodes ported to the Viewport Compositor. The update speed is everything.

Omar Emara commented

2022-11-11 20:31:13 +01:00

Changed status from 'Needs User Info' to: 'Needs Triage'