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Mountain Of Code · Jan 30, 2026

Speeding Up surface() In OpenSCAD

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When using complex shapes in OpenSCAD I find it's easiest to draw/find an image of the shape I want and then use surface () to convert the image to a 3D shape. It does this by mapping the brightness value of each pixel in the image to a height, AKA a height map. The trouble with surfaces is that OpenSCAD can quickly grind to a halt and eat all your RAM. I've seen 20GB of RAM disappear. Often the…

Read on /openscad-surface-performance

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