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

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