Materials Requirements Overview

To fulfill the requirements of this capability, materials must be properly defined using a portable material specification such as OpenPBR.

Material Implementation within OpenUSD

Requirement

• Materials must use valid OpenPBR specifications

• Material paths and bindings must be properly scoped and resolvable

• Material attributes must comply with their respective schemas

Schema

Materials is defined with the UsdShade schema, imlementing OpenPBR via MaterialX.

NVIDIA MDL

The capability requires OpenPBR because NVIDIA MDL materials are not considered to be portable. It is permitted for for backwards compatibility, but it is not recommended for new assets.

Requirements

The requirements listed here can be uniquely identified by their respective identifiers. Validators may refer to these ID’s to denote compliance.

Tags	Summary	Compatibility	Validator
🔑	Each renderable GPrim must have a computed material bound to it	core-usd
✅	Material bindings must use appropriate scope to ensure proper material assignment and inheritance.	open-usd	latest+
✅	Shader inputs must have correct types matching their shader specification to ensure proper material behavior and prevent runtime errors.	open-usd	latest+
✅	MDL material source assets must be properly referenced and accessible to ensure material loading and rendering.	open-usd	latest+
✅	MDL Shaders must standard OpenUSD shader source attributes to ensure compatibility.	kit-107+	latest+
✅	Material attributes must comply with the UsdPreviewSurface specification to ensure consistent rendering and viewer compatibility.	open-usd	latest+
✅	Each PBR texture channel must use the correct color space.	core-usd
🚀	Texture dimensions must not exceed 16,384 pixels on either axis to ensure optimal performance and memory usage in simulation environments.	open-usd	latest+