I've been looking at the python code loging of Blender. But in there things get loged as mouse clicks.

What i like to do is combine a few images into a larger one using compositor, but i need control over compositor by python script. The problem seams to me that it is a bit hard to "spawn" a few nodes, set their values and connect them.

I need an micture of: image, scale, source image location, mix nodes, output nodes

I have no Code samples other then the log of blender python which in this case is of no big help.


1 Answer 1


A simple code example:

# switch on nodes and get reference
bpy.context.scene.use_nodes = True
tree = bpy.context.scene.node_tree

# clear default nodes
for node in tree.nodes:

# create input image node
image_node = tree.nodes.new(type='CompositorNodeImage')
image_node.image = bpy.data.images['YOUR_IMAGE_NAME']
image_node.location = 0,0

# create output node
comp_node = tree.nodes.new('CompositorNodeComposite')   
comp_node.location = 400,0

# link nodes
links = tree.links
link = links.new(image_node.outputs[0], comp_node.inputs[0])

Here are node types you can create:
Nodes subclasses API

If you need anything more let me know.

  • $\begingroup$ the code fails me, could you post an example that works ? i itry to correct it myself but not sure what to type $\endgroup$
    – user613326
    Dec 9, 2014 at 11:28
  • $\begingroup$ This example works for me, what error message do you get? $\endgroup$ Dec 9, 2014 at 13:36
  • $\begingroup$ Python script fail, look in the console for now. But the console doesnt show anything so i'm puzzled. $\endgroup$
    – user613326
    Dec 11, 2014 at 12:21
  • $\begingroup$ Its the System console: MainMenuBar > Window > ToggleSystemConsole $\endgroup$ Dec 11, 2014 at 12:45
  • $\begingroup$ Aha it wants to load an image, from the location of the blend file; but it needs to use a fixed set path D:\BlenderTemp\myimage.jpg $\endgroup$
    – user613326
    Dec 11, 2014 at 15:23

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