shaderNodeMix can not be connected to other sockets with python API #109257

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Novice · 2023-06-22T20:20:39+02:00

Novice commented

2023-06-22 20:20:39 +02:00

System Information
Operating system: Windows-10-10.0.19045-SP0 64 Bits
Graphics card: Intel(R) Iris(R) Xe Graphics Intel 4.5.0 - Build 31.0.101.4032

Blender Version
Broken: version: 3.5.1, branch: blender-v3.5-release, commit date: 2023-04-24 18:11, hash: e1ccd9d4a1d3
Worked: I think never. https://docs.blender.org/api/3.4/bpy.types.ShaderNodeMix.html is new in 3.4

Short description of error
The out socket from ShaderNodeMix can not be connected to any input sockets by using python API. Blender think it's connected, but it's really not.
I tried the release candidate 3.6 and it seems to have the same error.

Exact steps for others to reproduce the error

Start blender.
Change the layout so one window is the python console and another is the shader editor.
In the python console, copy/paste ( you can skip the comments if you like)

Get the principled bsdf and check that nothing us connected to base color.

pbsdf = bpy.data.materials['Material'].node_tree.nodes['Principled BSDF']
pbsdf.inputs['Base Color'].is_linked

Create a ShaderNodeMix and change type to RGBA and check its output is not connected to anything.

shadermix = bpy.data.materials['Material'].node_tree.nodes.new('ShaderNodeMix')
shadermix.data_type = 'RGBA'
shadermix.outputs['Result'].is_linked

In the shader editor, move the created shaderNodeMix to the left so it will be easier to see it's not connected.

Connect output of ShaderNodeMix to principled bsdf base color.

Check that blender thinks they are connected even though no line is drawn between them.

bpy.data.materials['Material'].node_tree.links.new(pbsdf.inputs['Base Color'], shadermix.outputs['Result'])
pbsdf.inputs['Base Color'].is_linked
shadermix.outputs['Result'].is_linked

Now it says it's connected (is_linked returns true) but there's no line. In the principled bsdf it looks like it's connected but if you connect something to shaderNodeMix, there will be no changes to the default cube. See first image that the base color for principled bsdf seems to be connected.

Change type of ShaderNodeMix to FLOAT. Now the line is drawn.

shadermix.data_type = "FLOAT"
pbsdf.inputs['Base Color'].is_linked
shadermix.outputs['Result'].is_linked

Change back to RGBA, the line disappears.

shadermix.data_type = "RGBA"
pbsdf.inputs['Base Color'].is_linked
shadermix.outputs['Result'].is_linked

**System Information** Operating system: Windows-10-10.0.19045-SP0 64 Bits Graphics card: Intel(R) Iris(R) Xe Graphics Intel 4.5.0 - Build 31.0.101.4032 **Blender Version** Broken: version: 3.5.1, branch: blender-v3.5-release, commit date: 2023-04-24 18:11, hash: `e1ccd9d4a1d3` Worked: I think never. https://docs.blender.org/api/3.4/bpy.types.ShaderNodeMix.html is new in 3.4 **Short description of error** The out socket from ShaderNodeMix can not be connected to any input sockets by using python API. Blender think it's connected, but it's really not. I tried the release candidate 3.6 and it seems to have the same error. **Exact steps for others to reproduce the error** 1. Start blender. 2. Change the layout so one window is the python console and another is the shader editor. 3. In the python console, copy/paste ( you can skip the comments if you like) # Get the principled bsdf and check that nothing us connected to base color. pbsdf = bpy.data.materials['Material'].node_tree.nodes['Principled BSDF'] pbsdf.inputs['Base Color'].is_linked # Create a ShaderNodeMix and change type to RGBA and check its output is not connected to anything. shadermix = bpy.data.materials['Material'].node_tree.nodes.new('ShaderNodeMix') shadermix.data_type = 'RGBA' shadermix.outputs['Result'].is_linked # In the shader editor, move the created shaderNodeMix to the left so it will be easier to see it's not connected. # Connect output of ShaderNodeMix to principled bsdf base color. # Check that blender thinks they are connected even though no line is drawn between them. bpy.data.materials['Material'].node_tree.links.new(pbsdf.inputs['Base Color'], shadermix.outputs['Result']) pbsdf.inputs['Base Color'].is_linked shadermix.outputs['Result'].is_linked # Now it says it's connected (is_linked returns true) but there's no line. In the principled bsdf it looks like it's connected but if you connect something to shaderNodeMix, there will be no changes to the default cube. See first image that the base color for principled bsdf seems to be connected. # Change type of ShaderNodeMix to FLOAT. Now the line is drawn. shadermix.data_type = "FLOAT" pbsdf.inputs['Base Color'].is_linked shadermix.outputs['Result'].is_linked # Change back to RGBA, the line disappears. shadermix.data_type = "RGBA" pbsdf.inputs['Base Color'].is_linked shadermix.outputs['Result'].is_linked

looks_like_it_is_connected.JPG

90 KiB

it_is_connected.JPG

91 KiB

Novice added the

labels 2023-06-22 20:20:40 +02:00

Iliya Katushenock commented

2023-06-22 20:25:03 +02:00

I can confirm, however this issue has been reported before, see #103395. Will merge reports. Please subscribe in #103395 if you want to see further updates

I can confirm, however this issue has been reported before, see https://projects.blender.org/blender/blender/issues/103395. Will merge reports. Please subscribe in https://projects.blender.org/blender/blender/issues/103395 if you want to see further updates

Iliya Katushenock closed this issue

2023-06-22 20:25:05 +02:00

Blender Bot added

and removed

labels 2023-06-22 20:25:07 +02:00

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