I’ve built a parapet for my AchriCAD model and i really dont know anything about optimizing / simplyfying a geometry. I’ve tried exporting it as a polysurface and as a mesh, both almost crashed ArchiCAD.
what s the job of model as soon as it lives in archiCad ? - maybe more context is needed to help you.
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if it s just for visualisation - creating a texture / bump/ displacement map might be the way to go - a good graphic card will lift the work then …