Replicator fails to set material properties that are in a default state

Omniverse Synthetic Data Generation (SDG)
1

IsaacSim 5.1 and 6.0

Work Flow:

shader_prim = rep.get.prim_at_path("/World/Looks/Aluminum_Polished/Shader")

def rand_colors():
    lower_bound = (0.0, 0.0, 0.4) 
    upper_bound = (0.2, 0.3, 1.0)	
    with shader_prim:                     
        rep.modify.attribute("inputs:diffuse_tint", rep.distribution.uniform(lower_bound,upper_bound))

  1. The resulting Omnigraph Write node that gets created will error saying that inputs:diffuse_tint does not work.

  2. Open the shader and change the value of diffuse tint.

  3. Omnigraph no longer complains and the color changes as expected.

This is a similar issue that we see in the Variant editor where it fails to add properties from materials unless the user has “touched” or modified them in the interface.