material-base#

Code

NVM.002

Validator

latest+

Compatibility

rtx

Tags

✅

Summary#

Materials must specify a base material type

Description#

Materials bound to geometry prims with computed purpose “render” or “default” must have a non-visual material base property assigned to specify the base material type for non-visual sensor simulation.

Why is it required?#

  • Non-visual sensor simulation requires material properties. Material properties can be highly non-linear as a function of wavelength and therefore cannot be simply extrapolated from a visual material. The requirement for sensor simulation to have non-visual properties addresses these non-linearities.

  • Different materials have different sensor responses. This includes spectrally dependent electromagnetic and acoustic properties along with structural properties to define the non visual material behavior.

  • Base material type determines core sensor interaction behavior as a function of wavelength.

Examples#

# Invalid: No base material type specified
def Material "BadMaterial" (
    prepend apiSchemas = ["MaterialBindingAPI"]
)
{
    token omni:simready:nonvisual:coating = "clearcoat"
}

# Valid: Base material type specified
def Material "GoodMaterial" (
    prepend apiSchemas = ["MaterialBindingAPI"]
)
{
    token omni:simready:nonvisual:base = "aluminum"
    token omni:simready:nonvisual:coating = "clearcoat"
}

How to comply#

  • Set omni:simready:nonvisual:base on materials

  • Use valid base material types:

    • Metals: aluminum, steel, oxidized_steel, iron, oxidized_iron, silver, brass, bronze, oxidized_Bronze_Patina, tin

    • Polymers: plastic, fiberglass, carbon_fiber, vinyl, plexiglass, pvc, nylon, polyester

    • Glass: clear_glass, frosted_glass, one_way_mirror, mirror, ceramic_glass

    • Other: asphalt, concrete, leaf_grass, dead_leaf_grass, rubber, wood, bark, cardboard, paper, fabric, skin, fur_hair, leather, marble, brick, stone, gravel, dirt, mud, water, salt_water, snow, ice, calibration_lambertian