Houdini 20.0 Python scripting HOM Cookbook

HOM cookbook Python COP

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Overview

You can create compositing node (COP) assets that are defined by a Python script instead of a subnetwork of nodes (File ▸ New Asset…, click Python type, set Network type to “Compositing Generator” or “Composting Filter”). This example defines a Python COP that copies its input, creates a Cd (diffuse color) point attribute, and assigns each point a color based on the distance to a position.

Note

This example requires the numpy library which ships with Houdini.

Open $HFS/houdini/help/files/multi_stamp.hip to see the node.

Implementation

  • You can load the pre-made asset from $HFS/houdini/help/files/PythonCops.hda

  • Right-click a multistamp node and choose Type properties to open the asset’s type properties window.

  • We created parameters in the Parameters tab, just as we would for a normal asset.

  • The Code tab contains the Python code implementing the node’s logic.

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