rendering

Python for Blender Cheatsheet

Table of Contents

Import

Import Blender Python API

import bpy

Import OBJ Files

path_to_file=path_to_obj_dir+"/"+item
bpy.ops.import_scene.obj(filepath=path_to_file)
# print file name
obj_name=os.path.splitext(item)[0]
print(obj_name)

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Select

mesh_name="object-to-select"
obj=bpy.context.scene.objects[mesh_name]

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Shader

More details: Principled BSDF - Blender Manual

Create a Principled BSDF Shader

def newMaterial(id):
    mat=bpy.data.materials.get(id)
    if mat is None:
        mat=bpy.data.material(name=id)
    mat.use_nodes=True
    if mat.node_tree:
        mat.node_tree.links.clear()
        mat.node_tree.nodes.clear()
    return mat

def newShader(id,r,g,b,specular=0,roughness=0,transmission=0):
    mat=newMaterial(id)
    nodes=mat.node_tree.nodes
    links=mat.node_tree.links
    output=nodes.new(type='ShaderNodeOutputMaterial')
    shader=nodes.new(type='ShaderNodeBsdfPrincipled')
    nodes["Principled BSDF"].inputs[0].default_value=(r,g,b,1)
    nodes["Principled BSDF"].inputs[7].default_value=specular
    nodes["Principled BSDF"].inputs[9].default_value=roughness
    nodes["Principled BSDF"].inputs[17].default_value=transmission
    links.new(shader.outputs[0],output.inputs[0])
    return mat

Create a Mix

Mix=mat.node_tree.nodes.new("ShaderNodeMixRGB")

mat.node_tree.links.new(node_a.outputs[0],node_b.inputs[0])

Clear Existing Materials of Object obj and Add a New Material mat

obj.data.materials.clear()
obj.data.materials.append(mat)

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Animation

Insert Keyframe

More details: Keyframe(bpy_struct) - Blender Python API

current_frame=1
obj.keyframe_insert(data_path="location",frame=current_frame)

Hide/Show in Viewport

Being displayed in Blender viewport

obj.hide_viewport=True
obj.hide_viewport=False

Hide/Show when Render

Being rendered when render

obj.hide_render=True
obj.hide_render=False

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