Overview

omni.kit.converter.cad_core uses the HOOPS Exchange SDK to convert a variety of CAD data formats to USD.

When this extension loads, it will register itself with the CAD Converter service (omni.services.convert.cad) if it is available.

CAD CONVERTER CONFIG FILE INPUTS:

Conversion options are configured by supplying a JSON file. Below are the available configuration options.

JSON Converter Settings:

Format: “setting name” : default value

"sConfigFilePath" : "C:/test/sample_config.json"

Configuration file path

"sFilePathIn" : "C:/cad_part.jt"

Input file path.

NOTE : This will override import path argument from service.

"sFolderPathOut" : "C:/test/output"

Folder location for output.

NOTE : This will override output path argument from service.

"sFileNameOut" : ""

Name of output USD file (the head file only in the case of multiple output files)

"sSettingsFolderPath" : ""

Path to material csv and potentially any other settings files

"sStagePath" : ""

Path to target USD stage

"bInstancing" : true

Controls whether or not the usd model uses instances and prototypes. If false, then there is no instancing at all.

"bGlobalXforms" : false

When instancing = false, this flag controls whether globalXforms are composited. If false local transforms are applied

"bMappedMaterials" : false

Use material mapping or native materials

"iTessLOD" : 2

• iTessLOD0 = ExtraLow, ChordHeightRatio=50, AngleToleranceDeg=40,

• iTessLOD1 = Low, ChordHeightRatio=600, AngleToleranceDeg=40,

• iTessLOD2 = Medium, ChordHeightRatio=2000, AngleToleranceDeg=40,

• iTessLOD3 = High, ChordHeightRatio=5000, AngleToleranceDeg=30,

• iTessLOD4 = ExtraHigh, ChordHeightRatio=10000, AngleToleranceDeg=20.

"bAccurateSu2faceCurvatures" : true

If true, respect surface curvature to control triangles elongation directions.

"sUsdSuffix" : "usd"

• usd = USD (binary by default)

• usda = USD Ascii

• usdc = USD Crate (binary).

"bOptimize" : true

Flag to invoke USD scene optimization.

"sOptimizerConfigJson" : "c:/scene_optimization_config.json",

Full path to scene optimization configuration JSON file.

"bDedup" : true

If True, weld mesh elements in appropriate groups.

"bUseMaterials" : true

Setting for how part colors are converted to USD.

• If true converter creates OmniPBR materials with the color set as an attribute.

• If false converter will convert colors to USD displayColor primvars.

"bUseNormals" : true

If true then we pass normals to USD. if false, then we do not.

"bReportProgress" : true

If true then we report import/export progress

"bUseCurrentStage" : true

If true use currently opened USD.

Full sample_config.json:

{
  "sConfigFilePath" : "C:/test/sample_config.json",
  "sFilePathIn" : "C:/test/cad_part.jt",
  "sFolderPathOut" : "C:/test/converted",
  "sFileNameOut" : "",
  "sSettingsFolderPath" : "",
  "sStagePath" : "",
  "bInstancing" : true,
  "bGlobalXforms" : false,
  "bOptimize" : true,
  "sOptimizerConfigJson" : "",
  "bMappedMaterials" : false,
  "bDedup" : true,
  "iTessLOD" : 2,
  "bAccurateSu2faceCurvatures" : true,
  "sUsdSuffix" : "usd",
  "bUseNormals" : true,
  "bUseMaterials" : true,
  "bReportProgress" : true,
  "bUseCurrentStage" : true,
}