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In Blender/Python 2.8, I can't get my code to create the surface node I want (it creates a shader node along with a surface node that I don't want). The objective is to assign an image texture to an object as seen in three related posts (1, 2 and 3):

The manual process produces the desired result by setting up the node as follows: Surface node Diffuse BSDF

In Python I am attempting to do the same (code below), but the results aren't working out. First I'll show the output, then the code:

Here's the objectionable output:

enter image description here

And here's the node tree as created by my code; when I make the manual adjustments I note in the picture I get the final result that I want:

enter image description here

My flawed code is below. Before you criticize the obvious problem (that I am creating shaders), I have tried other approaches (replacing "Shader" with "Surface" and various other words) without success. I am also baffled as to why the "Principled BSDF" node appears out of nowhere.

Here's my code. Your suggestions would be highly appreciated. Thanks in advance!

matP_name='CCmat' matP = bpy.data.materials.get(matP_name) if matP is None: matP = bpy.data.materials.new(matP_name) matP.use_nodes=True nodes = matP.node_tree.nodes nodeID='ShaderNodeBsdfDiffuse' diffuse_BSDF = matP.node_tree.nodes.new(nodeID) path=TextureFolder+TextureFilenamePost imgTex = bpy.data.images.load(path) node_texture = nodes.new(type='ShaderNodeTexImage') node_texture.image = imgTex node_texture.location = 0,200 links = matP.node_tree.links link = links.new(node_texture.outputs[0], nodes.get('Diffuse BSDF').inputs[0]) obj=bpy.data.objects['CubeCopy1'] obj.active_material=matP
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    $\begingroup$ If I read correctly this code does not link the diffuse to the output. Also creating a new material will create principled and output by default. So you need to clear them. material.node_tree.links.clear() material.node_tree.nodes.clear() $\endgroup$ Commented Jul 29, 2019 at 16:02
  • $\begingroup$ @lemon Doesn't this create the link? link = links.new(node_texture.outputs[0], nodes.get('Diffuse BSDF').inputs[0]) $\endgroup$ Commented Jul 29, 2019 at 16:11
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    $\begingroup$ Yes but between texture and diffuse, not between diffuse and output $\endgroup$ Commented Jul 29, 2019 at 16:11
  • $\begingroup$ @lemon What python code would link diffuse and output? $\endgroup$ Commented Jul 29, 2019 at 16:13

1 Answer 1

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Small code that can bring the indication you need. 

import bpy # Clear all nodes in a mat def clear_material( material ): if material.node_tree: material.node_tree.links.clear() material.node_tree.nodes.clear() # Create a node corresponding to a defined group def instanciate_group( nodes, group_name ): group = nodes.new( type = 'ShaderNodeGroup' ) group.node_tree = bpy.data.node_groups[group_name] materials = bpy.data.materials mat_name = 'test' material = materials.get( mat_name ) if not material: material = materials.new( mat_name ) # We clear it as we'll define it completely clear_material( material ) material.use_nodes = True nodes = material.node_tree.nodes links = material.node_tree.links output = nodes.new( type = 'ShaderNodeOutputMaterial' ) diffuse = nodes.new( type = 'ShaderNodeBsdfDiffuse' ) #With names link = links.new( diffuse.outputs['BSDF'], output.inputs['Surface'] ) #Or with indices #link = links.new( diffuse.outputs[0], output.inputs[0] )

Note: when you create a new material (materials.new(...)), it creates two nodes by default (principled linked to ouput).

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