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Preflight Documentation

Model & Scene Properties

The Model Info and Scene Layer sections provide high-level context about the entire USD asset and its global configuration.

Model Info

Section titled “Model Info”

This read-only section displays the intrinsic properties of the loaded model:

  • Bounds: The bounding box dimensions (X, Y, Z) of the entire model.
  • Center: The spatial center of the model’s bounding box.
  • Scale: The global scale factor of the asset.
  • Up-Axis: The internal orientation of the asset (Y-Up or Z-Up).
  • Meters Per Unit: The physical scale of the asset (e.g., 1 unit = 1 meter or 1 unit = 1 centimeter).
  • Animations: The total count of animation clips detected in the file.

Scene Layer

Section titled “Scene Layer”

The Scene Layer section allows you to modify the global metadata of the current session or stage. Changes here affect how the entire file is interpreted by renderers like RealityKit.

Units and Orientation

Section titled “Units and Orientation”
  • Meters Per Unit: Change the physical scale of the asset. Preflight provides presets for common units:
    • Millimeters (0.001)
    • Centimeters (0.01)
    • Meters (1.0)
    • Inches (0.0254)
    • Feet (0.3048)
  • Up Axis: Switch between Y-Up and Z-Up. This is critical for ensuring your model is oriented correctly when moving between DCC tools like Blender (Z-up), Maya (Y-up), or Houdini (Y-up).

Default Prim

Section titled “Default Prim”

The Default Prim is the root prim that a renderer should typically load if no specific path is requested. You can manually specify this path (e.g., /Root) to ensure your asset is structured correctly for production pipelines.