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

SDF used to Deform Geometry

Building upon that collision detection, we can also use the SDF to deform the object upon the collision. Using the SDF value and some math, the grid can be deformed to create footprints stamped on by the Torus.

Computer Graphics, HoudinibubblepinsSeptember 22, 2019houdini, sidefx, SDF, SDF negative, signed distance field, distance, position, math, deform, deforming geometry, deform grid, displacement, displace P, animation, deformation, deforming grid, vector, vector math Comments

Sine Wave Animated Motion

Step by step mathematical explanation of the Sine Wave function and how it’s used in defining motion. Increasing the frequency and increasing the amplitude and flipping the entire curve function.

Computer Graphics, HoudinibubblepinsSeptember 22, 2019houdini, sidefx, sine wave, math, sin(x), sine wave motion, sin motion, period, frequency, x axis, y axis, amplitude, animation, animated torus, animation motion, sine animated motion Comments

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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