Added USD inherits / specializes test.

test/lib/mayaUsd/render/mayaToHydra/CMakeLists.txt

@@ -61,6 +61,7 @@ set(INTERACTIVE_TEST_SCRIPT_FILES
     testStageInstanceablePrimsSelHighlight.py|skipOnPlatform:osx # HYDRA-1315 : Wire not showing on OSX
     testIsolateSelectWithGeomSubset.py
     testMayaReference.py
+    testUsdInheritsSpecializes.py
     cpp/testColorPreferences.py
     cpp/testCppFramework.py
     cpp/testDataProducerExample.py

test/lib/mayaUsd/render/mayaToHydra/testUsdInheritsSpecializes.py

@@ -0,0 +1,66 @@
+# Copyright 2025 Autodesk
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+import maya.cmds as cmds
+import fixturesUtils
+import mtohUtils
+import testUtils
+import usdUtils
+
+class TestUsdInheritsSpecializes(mtohUtils.MayaHydraBaseTestCase):
+    # MayaHydraBaseTestCase.setUpClass requirement.
+    _file = __file__
+
+    _requiredPlugins = ['mayaHydraCppTests']
+
+    IMAGE_DIFF_FAIL_THRESHOLD = 0.1
+    IMAGE_DIFF_FAIL_PERCENT = 2
+
+    @property
+    def imageFileName(self):
+        # Same image snapshot for both inherits and specializes test.
+        return 'inherits.png'
+
+    def setUp(self):
+        super(TestUsdInheritsSpecializes, self).setUp()
+        self.modifyDefaultLightIntensityByUsdVersion()
+
+    def loadUsdScene(self, fileName):
+
+        # Move the camera in closer
+        self.setBasicCam(5)
+
+        usdScenePath = testUtils.getTestScene('testUsdInheritsSpecializes', fileName)
+        usdUtils.createStageFromFile(usdScenePath)
+
+    def test_Inherits(self):
+
+        self.loadUsdScene('cubeInherits.usda')
+
+        cmds.refresh()
+
+        self.assertSnapshotClose(self.imageFileName, self.IMAGE_DIFF_FAIL_THRESHOLD, self.IMAGE_DIFF_FAIL_PERCENT)
+
+    def test_Specializes(self):
+
+        self.loadUsdScene('cubeSpecializes.usda')
+
+        cmds.refresh()
+
+        # Same snapshot as inherits.
+        self.assertSnapshotClose(self.imageFileName, self.IMAGE_DIFF_FAIL_THRESHOLD, self.IMAGE_DIFF_FAIL_PERCENT)
+
+if __name__ == '__main__':
+    fixturesUtils.runTests(globals())

test/testSamples/testUsdInheritsSpecializes/cubeInherits.usda

@@ -0,0 +1,33 @@
+#usda 1.0
+
+class Xform "_class_BaseCube"
+{
+    def Mesh "cube"
+    {
+        uniform bool doubleSided = 1
+        float3[] extent = [(-0.5, -0.5, -0.5), (0.5, 0.5, 0.5)]
+        int[] faceVertexCounts = [4, 4, 4, 4, 4, 4]
+        int[] faceVertexIndices = [0, 1, 3, 2, 2, 3, 5, 4, 4, 5, 7, 6, 6, 7, 1, 0, 1, 7, 5, 3, 6, 0, 2, 4]
+        point3f[] points = [(-0.5, -0.5, 0.5), (0.5, -0.5, 0.5), (-0.5, 0.5, 0.5), (0.5, 0.5, 0.5), (-0.5, 0.5, -0.5), (0.5, 0.5, -0.5), (-0.5, -0.5, -0.5), (0.5, -0.5, -0.5)]
+        color3f[] primvars:displayColor = [(1, 0, 0)]
+        token visibility = "inherited"
+    }
+}
+
+def "CubeA" (
+    inherits = </_class_BaseCube>
+)
+{}
+
+def "CubeB" (
+    inherits = </_class_BaseCube>
+)
+{
+    double3 xformOp:translate = (2.0, 0, 0)
+    uniform token[] xformOpOrder = ["xformOp:translate"]
+
+    over "cube"
+    {
+        color3f[] primvars:displayColor = [(0, 1, 0)]
+    }
+}

test/testSamples/testUsdInheritsSpecializes/cubeSpecializes.usda

@@ -0,0 +1,28 @@
+#usda 1.0
+(
+    defaultPrim = "World"
+)
+
+def Xform "World"
+{
+    def Mesh "cubeBase"
+    {
+        uniform bool doubleSided = 1
+        float3[] extent = [(-0.5, -0.5, -0.5), (0.5, 0.5, 0.5)]
+        int[] faceVertexCounts = [4, 4, 4, 4, 4, 4]
+        int[] faceVertexIndices = [0, 1, 3, 2, 2, 3, 5, 4, 4, 5, 7, 6, 6, 7, 1, 0, 1, 7, 5, 3, 6, 0, 2, 4]
+        point3f[] points = [(-0.5, -0.5, 0.5), (0.5, -0.5, 0.5), (-0.5, 0.5, 0.5), (0.5, 0.5, 0.5), (-0.5, 0.5, -0.5), (0.5, 0.5, -0.5), (-0.5, -0.5, -0.5), (0.5, -0.5, -0.5)]
+        color3f[] primvars:displayColor = [(1, 0, 0)]
+        token visibility = "inherited"
+    }
+
+    def Mesh "specializedCube" (
+        specializes = </World/cubeBase>
+    )
+    {
+        double3 xformOp:translate = (2.0, 0, 0)
+        uniform token[] xformOpOrder = ["xformOp:translate"]
+
+        color3f[] primvars:displayColor = [(0, 1, 0)]
+    }
+}