Barrett's Houdini Sketchbook

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Here is my attempt at the houdni sparse pyro solver flamethrower. the original tutorial can be found here - https://www.youtube.com/watch?v=Fm7q1i1-SZo&t=1s

The dragon animation can be found here, https://gumroad.com/truebones?recommended_by=search&sort=newest&tags=fbx#skZMC

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A fairly simple setup. But very useful

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Here’s a way to simulate chain with vellum really quickly. Its not the most accurate solve but its very fast.

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I saw a question about uprezing multiple vellum soft bodies on the odforce forum, this was my answer. The hero to this set up is the BirthID, which I set to the frame of birth. A ForEach loop set to the BirthID is then used to point deform the hero mesh with the vellum sim.

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Fake Vellum Rigid Body

To Fake rigid body behavior I use tetrahedral mesh to simulate and copy the motion onto packed geometry using the point deformer.

HIP Houdini Anime Hair in Vellum

This technique isn’t limited to or even created for anime style hair, it’s just very good at it.

HIP Detangle for Animation character FX preparation

Here’s how you can use the Detangle sop to remove self intersecting animated mesh.

You take the animated mesh and simplifying it by shrinking and smooth it. You use this simplified version as the rest position for the Detangle sop. The Detangle sop will then blend the intersecting mesh to that of the rest position.

This method while solving very fast, is not perfect. It has a weakness towards fine mesh and where even the shrinked mesh is intersecting.

The key principle of the system is inspired by “Delta Mush” - https://vimeo.com/103666815 .