Export to STEP in OpenSCAD
The only way to obtain STEP from OpenSCAD that I know is an external tool that someone made. It's pretty crazy actually: it parses OpenSCAD's native export, CSG, and issues commands to OpenCASCADE's CLI, OCC-CSG. The biggest issue for me here is that his approach cannot handle transformations that the CLI does not support. I use hull all over the place and a tool that does not support hull is of no use for me.
So I came up with a mad lad idea: just add a native export of STEP to OpenSCAD. The language itself is constructive, and an export to CSG exists. I just need to duplicate whatever it does, and then at each node, transform it into something that can be expressed in STEP.
As it turned out, STEP does not have any operations. It only has manifolds assembled from faces, which are assembled from planes and lines, which are assembled from cartesian points and vectors. Thus, I need to walk the CSG, compile it into a STEP representation, and only then write it out. Operations like union, difference, or hull have to be computed by my code. The plan is to borrow from OpenSCAD's compiler that builds the mesh, only build with larger pieces - possibly square or round.
Not sure if this is sane and can be made to work, but it's pretty fun at least.
So I came up with a mad lad idea: just add a native export of STEP to OpenSCAD. The language itself is constructive, and an export to CSG exists. I just need to duplicate whatever it does, and then at each node, transform it into something that can be expressed in STEP.
As it turned out, STEP does not have any operations. It only has manifolds assembled from faces, which are assembled from planes and lines, which are assembled from cartesian points and vectors. Thus, I need to walk the CSG, compile it into a STEP representation, and only then write it out. Operations like union, difference, or hull have to be computed by my code. The plan is to borrow from OpenSCAD's compiler that builds the mesh, only build with larger pieces - possibly square or round.
Not sure if this is sane and can be made to work, but it's pretty fun at least.