Works around KitXR Fabric/USD render settings incompatibility (#468)

# Description

KitXR is experiencing a performance degradation when Fabric and/or USD
render setting attributes are used. Since
we do not use these for XR render settings, we will disable them as a
workaround solution.

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- Bug fix (non-breaking change which fixes an issue)

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apps/isaaclab.python.xr.openxr.headless.kit

@@ -22,6 +22,10 @@ app.useFabricSceneDelegate = true
 # Temporary, should be enabled by default in Kit soon
 rtx.hydra.readTransformsFromFabricInRenderDelegate = true
 
+# work around for kitxr issue
+app.hydra.renderSettings.useUsdAttributes = false
+app.hydra.renderSettings.useFabricAttributes = false
+
 [settings.isaaclab]
 # This is used to check that this experience file is loaded when using cameras
 cameras_enabled = true

apps/isaaclab.python.xr.openxr.kit

@@ -31,6 +31,10 @@ app.useFabricSceneDelegate = true
 # Temporary, should be enabled by default in Kit soon
 rtx.hydra.readTransformsFromFabricInRenderDelegate = true
 
+# work around for kitxr issue
+app.hydra.renderSettings.useUsdAttributes = false
+app.hydra.renderSettings.useFabricAttributes = false
+
 [dependencies]
 "isaaclab.python" = {}