2. Command Line Tool Usage, CAD to CSG conversion#

GEOUNED CAD to CSG conversion can be performed in the command line.

These examples assumes you have a CAD STEP file in the current working directory of the terminal called “cuboid.stp”

The most minimal use case below shows a minimal config.json file being used.

First create a JSON file called “config.json” containing the following.

{
    "load_step_file": {
        "filename":"cuboid.stp"
    }
}

Then execute the command line interface tool to convert your STEP file to CSG files with the default configuration.

geouned_cadtocsg -i config.json

The following example shows a usage with every attributes specified in the config.json file.

The contents of the JSON file closely matches the Class arguments and method arguments when using the Python package.

For a full description of each keyword see the Python API reference section of the documentation.

Here is a complete JSON file specification

{
    "load_step_file": {
        "filename": "cuboid.stp",
        "skip_solids": []
    },
    "Options": {
        "forceCylinder": false,
        "newSplitPlane": true,
        "delLastNumber": false,
        "enlargeBox": 2.0,
        "nPlaneReverse": 0,
        "splitTolerance": 0.0,
        "scaleUp": true,
        "quadricPY": false,
        "Facets": false,
        "prnt3PPlane": false,
        "forceNoOverlap": false
    },
    "Tolerances": {
        "relativeTol": false,
        "relativePrecision": 1e-06,
        "value": 1e-06,
        "distance": 0.0001,
        "angle": 0.0001,
        "pln_distance": 0.0001,
        "pln_angle": 0.0001,
        "cyl_distance": 0.0001,
        "cyl_angle": 0.0001,
        "sph_distance": 0.0001,
        "kne_distance": 0.0001,
        "kne_angle": 0.0001,
        "tor_distance": 0.0001,
        "tor_angle": 0.0001,
        "min_area": 0.01
    },
    "NumericFormat": {
        "P_abc": "14.7e",
        "P_d": "14.7e",
        "P_xyz": "14.7e",
        "S_r": "14.7e",
        "S_xyz": "14.7e",
        "C_r": "12f",
        "C_xyz": "12f",
        "K_xyz": "13.6e",
        "K_tan2": "12f",
        "T_r": "14.7e",
        "T_xyz": "14.7e",
        "GQ_1to6": "18.15f",
        "GQ_7to9": "18.15f",
        "GQ_10": "18.15f"
    },
    "Settings": {
        "matFile": "",
        "voidGen": true,
        "debug": false,
        "compSolids": true,
        "simplify": "no",
        "exportSolids": "",
        "minVoidSize": 200.0,
        "maxSurf": 50,
        "maxBracket": 30,
        "voidMat": [],
        "voidExclude": [],
        "startCell": 1,
        "startSurf": 1,
        "sort_enclosure": false
    },
    "export_csg":{
        "title": "Converted with GEOUNED",
        "geometryName": "csg",
        "outFormat": ["openmc_xml", "openmc_py", "serpent", "phits", "mcnp"],
        "volSDEF": false,
        "volCARD": true,
        "UCARD": null,
        "dummyMat": false,
        "cellCommentFile": false,
        "cellSummaryFile": true
    }
}

Note that JSON requires `null` to be passed in which gets translated to `None` in Python. This is converted in the same way as the minimal JSON config file

geouned_cadtocsg -i config.json
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