Feature: ID:006 - Materials - Base

Description

The Materials Feature provides support for material definitions in USD assets, enabling consistent material appearance across different rendering engines and viewers. This feature supports both standard USD Preview Surface materials and advanced Material Definition Language (MDL) materials for different use cases and rendering workflows.

USDPreviewSurface Format

Version 0.1.0

Details

Property	Value
Internal ID	FET006_BASE_USDPREVIEW

Used in Profiles

This version is used in the following profiles:

• Prop Robotics Neutral Profile (v0.1.0) - Used as the base material feature for USDPreviewSurface materials

Requirements

• Capability: Visualization/Materials

  • Requirements

    • Material-Bind-Scope

      • VM.BIND.001 | version 0.1.0

      • Rule | Implementation

    • Material-Preview-Surface

      • VM.PS.001 | version 0.1.0

      • Rule | Implementation

• Material Paths:

  • all relative, exist.

Material binding on all meshes, that aren’t ‘type=guides’.

Pipelines Supported for this Feature

Source file type:

• .blend

  • Via Blender SimReady Add-ons

• .mjcf

  • Via Blender SimReady Add-ons + MJCF2USD Tool

• .step

  • Via Blender SimReady Add-ons + CAD Converter

Samples

• sample_content/common_assets/props_general/obs_lamp_revolute_01/simready_usd/obs_lamp_revolute_01.usd

Test Process

• Obtain the usd sdk

  • usd sdk link

• Confirm your asset in question has passed validation

• In your commandline type:

  • path/to/usdsdk/scripts/usdrecord <path to usdfile.usd> <path to output.png>

• Open up path/to/output.png

• Expected Result:

  • Confirm it is NOT empty or completely black

  • Materials should render with proper USDPreviewSurface appearance

  • Example image:

MDL Format

Version 0.1.0

Details

Property	Value
Internal ID	FET006_BASE_MDL
Proprietary Techs	MDL

Used in Profiles

• Material Paths:

  • all relative, exist.

• MDL Paths

  • all relative, exist.

• MDL Compiles?

  • MDL Checker exists already?

• Glass?

Material binding on all meshes, that aren’t ‘type=guides’.

OmniPBR / SimPBR: * Color Space for textures. * ORM analysis? if strength > 0, ensure map is there. * Confirm ORM floats are 0 if map is bound.

This version is used in the following profiles:

• Prop Robotics Physx Profile (v0.1.0) - Used as the advanced material feature for MDL materials

Requirements

Property	Value
Dependency	ID:006 - Materials - Base - USDPreviewSurface Format - v0.1.0

• Capability: Visualization/Materials

  • Requirements

    • Material-Bind-Scope

      • VM.BIND.001 | version 0.1.0

      • Rule | Implementation

    • Material-Shader-Inputs

      • VM.BIND.002 | version 0.1.0

      • Rule | Implementation

    • Mesh Material Binding

      • VM.MAT.001 | version 0.1.0

      • Rule | Implementation

    • Material-MDL-Schema

      • VM.MDL.002 | version 0.1.0

      • Rule | Implementation

    • Material-MDL-Source-Asset

      • VM.MDL.001 | version 0.1.0

      • Rule | Implementation

    • Material-Texture-Size

      • VM.TEX.001 | version 0.1.0

      • Rule | Implementation

    • Material-Texture-Colorspace

      • VM.TEX.002 | version 0.1.0

      • Rule | Implementation

Pipelines Supported for this Feature

None; USDPreviewSurface Format is acceptable.

Samples

• sample_content/common_assets/props_general/obs_lamp_revolute_01/simready_usd/obs_lamp_revolute_01.usd

Test Process

• Obtain Isaac Sim or Omniverse Create

  • Omniverse Create link

• Confirm your asset in question has passed validation

• Open the asset in Omniverse Create

• Expected Result:

  • Materials should render with proper MDL appearance

  • Advanced material features should be functional

  • Material should be compatible with MDL rendering pipeline