usdgeom-mesh-non-opaque-must-have-thickness#

Code

VG.031

Validator

Compatibility

core usd

Tags

✅

Summary#

Meshes made from non opaque materials shall have thickness

Description#

Raytraced visualization of non opaque materials necessetates that the rendered geometric body has thickness, so that refraction and transmission can be calculated with sufficient accuracy. Thin / single sided meshes will not appear correct.

Ensure that meshes that represent non-opaque objects have faces “on both sides” and that their winding order correctly denotes their orientation.

Note

This requirement does not relate to thin surfaces such as paper or leaves.

Why is it required ?#

  • Accurate shading of transmission requires thickness

  • Accurate shading of refraction requires thickness

How to comply#

  • Model non-opaque meshes to be watertight / have “thickness”

  • When optimizing, take care to not remove interior faces from non-opaque objects