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Tag: Houdini

Houdini Volume Gradients are Like Surface Normals

I’d seen volume gradients used in a few places and not really understood them. Houdini help says: “the gradient is a vector pointing in the direction of increasing volume values.” Hmm. Nothing if not laconic.

Published 15 October, 2021
Categorized as Technical Tagged erode, gradient, Houdini, melt, normal, volume, volumegradient, VOP

Houdini Frozen Geometry Tutorial

Really excellent tutorial — very clear, well-paced, and with solid workflow — by Armin Lofti showing how to abuse the pyro source spread node (introduced in Houdini 18) as a quick and dirty way to drive noised infections and growth patterns, used here to grow a sheath of ice around a freezing object.

Published 24 September, 2021
Categorized as Tutorial Tagged frozen, growth, Houdini, ice, icicle, infection, pyrosourcespread, Redshift

Melting Objects by Varying Viscosity in Houdini FLIP

Converting a mesh into a highly viscous FLIP fluid in Houdini, then selectively lowering the viscosity of certain areas by raising their temperature, is a fairly simple way to simulate a melting object, with reasonable art-directability by means of noising and animating an invisible heat source.

Published 28 May, 2020
Categorized as Technical Tagged diffusion, FLIP, Houdini, melt, VEX, viscosity
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