Currently my 3D model have too many meshs/polygons. My model is simple, in the sense that it is only a Union of a box and a cylinder. But after BoundaryDiscretizeRegion, the mesh count is ~2000. Here’s my model: cube = Cuboid[] // Graphics3D // DiscretizeGraphics; cylinder = Cylinder[{{0, 0, -2}, {0, 0, 2}}, 1] //Read more