Half-Life: Alyx Workshop Tools/Modeling/Houdini Vertex Animation

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Place holder

This tutorial assumes working knowledge of Houdini and only demonstrates how to correctly export vertex animations to Source 2, using Houdini version 19+.

Install SideFX Labs

Read up on how to install SideFX Labs here


Install Valve_outputnodes.hda

Download the Valve_outputnodes.hda file [ here] TODO: ADD LINK TO .HDA FILE

Read up on how to install the Houdini Digital Asset (.hda) here

Choose File > Import > Houdini Digital Asset


Rigid Body Simulation

Houdini rigid body simulation documentation here

Add a rest node before starting the simulation on your mesh, this is required to avoid incorrect data on pos0 caused by texture edge bleeding.

Example: rest pose node before the rbdbulletsolver1

Hla s2houdini rest node.jpg


Houdini export settings

  • Export node, select the last node in the simulation - a cache will be faster.
  • Engine scale 39.3701 (when working in meters)
  • Frame Settings ( simulation range) 1 to ..N.
  • Check attributes : Delta = P ; Rest = rest ; Frame = orient.
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