csg2stp

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convert openscad design to step brep

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# csg2stp
convert openscad design to step brep

## Why
The mesh output from OpenSCAD is not suitable for CNC (the actual shapes are not preserved to compile sane G-CODE). There's no way to add these information after the object is "rendered" to mesh, these information are lost forever. The arcs are turned to polygons, the surfaces are also turned to a mesh, etc. Because of this the only way to build a usable STEP file is to go back to the CSG output of OpenSCAD and rebuild the object using OPENCASCADE which is the only open source BREP library I know.

## Requirements
Use my fork of OCC-CSG:
https://github.com/gega/OCC-CSG.git
branch: sweep

This fork has the necessary changes to support the complex conversions:

- sweep command for rotate_extrude
- random rotation for rotationally symmetric primitives
- brep analysis for csg operation to prevent crashes

Compile and install this tool with the extended features.

You also need to have OpenSCAD installed and available in your path.

## Usage

csg2stp.sh part.scad [loops] [args]

- **part.scad:** the OpenSCAD file to be converted
- **loops:** number of STEP parts generated

_for complex objects multiple rounds needed to convert successfully_

[default: 1]
- **args:** additional OpenSCAD parameters

[default: none]

## Manual Operation

1. compile and install OCC-CSG (use my fork and the sweep branch)

```git clone https://github.com/gega/OCC-CSG.git ; cd OCC-CSG ; git checkout sweep ; mkdir build ; cd build ; cmake .. ; make ; sudo make install```

3. build these utilities with cloning this repo and make

```git clone git@github.com:gega/csg2stp.git ; cd csg2stp ; make```

4. open your design in OpenSCAD, render and export as CSG

```openscad -o model.csg model.scad```

5. feed the csg to csg2xml and redirect the stdout to an xml file

```./csg2xml <model.csg >model.xml```

6. use xml2mak to generate a makefile

```./xml2mak model.xml model.stp >model.mak```

7. use make -f with the generated makefile

```make -f model.mak```

8. model.stp is generated, check if valid and complete, if not, go to step 6 and try again

## Fine Print

**NOTE:** The following OpenSCAD commands are not supported because OPENCASCADE doesn't implement them:
- hull
- import
- projection
- minkowski

**WARNING:** The process is not deterministic, for some models it needs to be converted several times in order to get the proper results!

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