keywords: Houdini, Vertex Animation Textures

Tutorials

Crowds

Vertex Animation Textures for Crowds
https://www.youtube.com/watch?v=StGJ1l8noNs

Issues

Unreal material editor cache issue

If duplicate a material that contains vertex animation and change the texture parameters, you need to restart Unreal editor to refresh the vertex animation, otherwise there’re some issues on playing animation.

Rigid-Body Dynamics (Rigid) mode expects the point attributes “pivot” and “orient”

Error on rendering:

Error: Rigid-Body Dynamics (Rigid) mode expects the point attributes "pivot" and "orient" on packed points but at least one of them is not found on the input geometry..

Solution:
Set Transfer Attributes as orient pivot in Output panel if using RBD Bullet Solver.

Can’t play vertex animation when baking with a large velocity.

If baking vertex animation texture with a large velocity:

vertex animation may not work in Unreal Engine, this may be an issue of Houdini.

Solution:
Bake animation twice: one with low velocity, another one with high velocity. Then import the FBX of low velocity and the textures (position, rotation) of high velocity into engine.

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