Pixar USD (Universal Scene Description) Writer Parameters

USD Format

This parameter controls the format of the USD output, which can be either binary or text.

  • USDC (BINARY) – The writer will produce a .usdc file.
  • USDA (TEXT) – The writer will produce a .usda file.

Dataset Format

This parameter controls whether output files are written into a folder or combined into a USDZ archive.

  • Directory – All output files for all feature types will be written to the dataset folder.
  • USDZ (Zip File) – A USDZ file will be produced for each feature type. The USDZ archive will contain all of the textures required by the USD output.

This parameter controls which unit of measurement the output data is written in. When this option is checked, all features will be scaled so that the geometry is measured in meters. The scaling factor will be calculated for each feature, based on the unit of measurement used by the feature's coordinate system. Features without a coordinate system will be assumed to already be in meters, and will not be scaled.

When this option is unchecked, all features will be scaled to be in the same unit of measurement as the first feature. This unit of measurement will be saved in the USD dataset, so the output will be sized correctly when imported into other software.

Features with no coordinate system will be assumed to already have the same unit of measurement as the first feature.

If the first feature has no coordinate system, it will be assumed to be in meters.

Coordinate System

Note that the options described below are not available in all formats.

  • Yes – Coordinates of all the points in the written features will be normalized to the interval [-0.5, 0.5] on the largest side of their XYZ-bounding cube. The other dimensions will be scaled proportionally. Additionally, the transformation matrix required to scale the model back to world coordinates will be written to a companion .fwt file. This can be used to improve precision of the written coordinates. The companion .fwt file will have the same name as the primary data file and will be written in the same folder. For folder-based formats, the file global.fwt will be written instead.
  • No – The original coordinates will be written as provided. Coordinates will not be projected; .fwt world and .prj files will not be generated.
  • Create Projection File Only – A companion .prj file containing the coordinate system and having the same name as the primary data file will be written in the same folder. For folder-based formats, the file global.prj will be written instead. Coordinates will not be projected and a world file will not be generated.
  • Transform Coordinates Only – Transforms the coordinates as in the Yes option, but companion .prj and .fwt world files will not be generated.