USD Export
USD (Universal Scene Description) is an open standard for describing and exchanging 3D scenes, increasingly central to modern pipelines. Ornatrix App can export hair to USD (.usd, .usda, .usdc), so your groom fits naturally into USD-based scene assembly and rendering.
Exporting hair
Export the current scene's hair and meshes to a USD file through the export dialog, which lets you control how the hair is written. Hair is exported as curve data that USD-aware renderers and applications can read, meshes as polygon meshes with their normals and texture coordinates. The material assigned to each object is written with it as a UsdPreviewSurface network bound to the object, with its texture maps saved as PNG images into a folder named after the USD file, so the shading survives in any USD application; an Ornatrix host reading the file back restores the material completely, including the hair only channels. Hair shaded by a Hair Material also carries the strand colors that material gives it, in the color attribute the chosen target host expects. Animated grooms can be written across a frame range.
When to choose USD
- Your pipeline is built around USD for scene assembly and layering.
- You want hair to live alongside other assets in a USD stage.
For pipelines built around Alembic, export to that format instead. See Alembic Export. If you simply want to move a groom between Ornatrix products, save the groom file rather than exporting geometry. See Saving and Loading Grooms.
Related
- USD Import - bring USD geometry or hair in.
- Alembic Export - the other main hair interchange format.
- Importing and Exporting Geometry - overview of interchange in the App.