The Arnold options node has a usdlux_version parameter that enables USDLux compatibility. Setting usdlux_version to 25.05 activates the current Arnold implementation of the USDLux standard for USD lights. This early development preview includes support for IES orientation and brightness normalization.
Features
Cone Shaping on Non-Sphere Lights
Cone angle and softness support for cylinder, disk, quad, and mesh lights, with focus and focus tint effects. Extended cone angles up to 180 degrees, with per-ray evaluation for accurate spotlight behavior.
Cone Angle
10
20
30
Cone Softness
0
0.5
1
Shaping Focus
0
10
20
30
40
50
Shaping Focus Tint
White
Color
IES Profile Extensions
IES Filename
IES Angle Scale
Rescaling of IES profile angular distribution.
0
2
3
IES Normalization
Normalizes IES profile intensity by integrating over solid angle.
0
1
IES on Non-Sphere Lights
IES profiles on cylinder, disk, quad, and mesh lights.
Sphere
Cylinder
Limitations
Type-A and Type-B photometry (only Type-C currently supported)
