Houdini expressions are functions available to help you calculate values in the parameters of the nodes. You may have seen $HIPNAME which returns the name of the current hip file. Or the centroid one that I use most often for procedural modeling, $CEX $CEY $CEZ, which returns the centroid vector component.

Computer Graphics, HoudinibubblepinsSeptember 27, 2019houdini, sidefx, math, fit range, ptnum, point number, remap values, random function, rand(), fit(), random seed, height data, height, terrain, texture map, height map, houdini expressionComment

Math behind the Mask by Feature Ramp Remapped Values

This is an explanation of the math behind how the Height Ramp in the Height Field Mask by Feature node in Houdini is calculated.

Computer Graphics, HoudinibubblepinsAugust 26, 2019houdini, sidefx, height fields, mask by feature ramp, remap values, height ramp, ramp, ranges, math, terrain generationComment

"set_density" Deep Dive into the Math Behind It

This post explains a specific node, “set_density” and how the math works in calculating the density attribute. I’ll try to explain the math behind it and how the node works.

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