HYDRA-2347 : Add Arnold custom attributes on Maya node unit test

[benyoon-adsk]

List of tested Arnold custom attributes on Maya nodes:

• Mesh
  • aiSubdivType, aiDispHeight, aiOpaque, aiMatte, aiSelfShadows
• Camera
  • aiExposure, aiFocusDistance
• Lights
  • directionalLight
    • aiAngle, aiCastVolumetricShadows, aiColorTemperature, aiExposure
  • areaLight
    • aiResolution, aiSpread, aiRoundness

[Copilot]

Pull request overview

Adds a new Arnold-focused test pair (Python driver + C++ GTest) to validate translation of Arnold custom attributes on native Maya nodes through the Arnold scene index chain, and wires the new test into the existing mayaToHydra C++ test target / interactive test script list.

Changes:

• Add testArnoldCustomAttributesMayaNodes.py/.cpp to exercise Arnold ai* attributes on mesh/camera/lights and validate resulting Hydra primvars / light schema values.
• Register the new C++ test source and Python script in the relevant CMake test lists.
• Rename the existing testArnoldCustomNodes.cpp GTest suite name (currently breaks the Python harness mapping).

Reviewed changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 9 comments.

Show a summary per file

File	Description
test/lib/mayaUsd/render/mayaToHydra/cpp/testArnoldCustomNodes.py	Removes dead/commented teardown snippet (no functional change).
test/lib/mayaUsd/render/mayaToHydra/cpp/testArnoldCustomNodes.cpp	Renames GTest suite identifiers (currently mismatched with Python driver).
test/lib/mayaUsd/render/mayaToHydra/cpp/testArnoldCustomAttributesMayaNodes.py	New Python driver that sets Arnold renderer, creates nodes, and dispatches into C++ tests.
test/lib/mayaUsd/render/mayaToHydra/cpp/testArnoldCustomAttributesMayaNodes.cpp	New C++ GTests validating Arnold attr → primvar/light-schema translation.
test/lib/mayaUsd/render/mayaToHydra/cpp/CMakeLists.txt	Adds new C++ test source to the cpp test target.
test/lib/mayaUsd/render/mayaToHydra/CMakeLists.txt	Adds new Python script to the interactive test scripts list (Maya > 2026).

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[ppt-adsk]

Thanks for the test!