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when adding a Value node through the geometry node tree editor I can enter #frame in the value field to have it synced up with the animation frame index (for procedural animation etc.)

enter image description here

However, I haven't found a way to add this kind of node with python. I was expecting to be able to do something like this:

modifier.node_group.nodes["Value"].outputs[0].default_value = "#frame"

But then I just get

TypeError: bpy_struct: item.attr = val: NodeSocketFloat.default_value expected a float type, not str

Is there any way to make use of this feature using only scripting?

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1 Answer 1

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Add a driver from nodes

import bpy

md = bpy.context.object.modifiers["GeometryNodes"]
dr = md.node_group.nodes["Value"].outputs[0].driver_add("default_value")
dr.driver.expression = "frame"
bpy.context.view_layer.update()
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  • $\begingroup$ thanks! For some reason driver_add doesn't show up in node_group.nodes["Value"].outputs[0].__dir__() so I was unable to find it $\endgroup$
    – Linus
    Commented Jun 26, 2022 at 8:18

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