HYDRA-805 - add test for look through camera&lights (#73)

* add test for look through camera&lights

* use different image diff tolerance

* update based on review

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

@@ -17,6 +17,7 @@ set(INTERACTIVE_TEST_SCRIPT_FILES
     testMayaLights.py
     testUSDLights.py
     testArnoldLights.py
+    testLookThrough.py
     testStandardSurface.py
     testFlowViewportAPI.py
     testStageVariants.py

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

@@ -0,0 +1,67 @@
+#
+# Copyright 2024 Autodesk, Inc. All rights reserved.
+#
+# 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 mayaUtils
+import platform
+
+class TestLookThrough(mtohUtils.MtohTestCase): #Subclassing mtohUtils.MtohTestCase to be able to call self.assertSnapshotClose
+    # MayaHydraBaseTestCase.setUpClass requirement.
+    _file = __file__
+
+    @property
+    def imageDiffFailThreshold(self):
+        return 0.01
+
+    @property
+    def imageDiffFailPercent(self):
+        # HYDRA-837 : Wireframes seem to have a slightly different color on macOS. We'll increase the thresholds
+        # for that platform specifically for now, so we can still catch issues on other platforms.
+        if platform.system() == "Darwin":
+            return 3
+        return 0.2
+
+    #Test look through camera and maya lights (spot & area).
+    def test_LookThrough(self):
+        # Load a maya scene with a maya native cubic
+        testFile = mayaUtils.openTestScene(
+                "testLookThrough",
+                "testLookThrough.ma")
+        cmds.refresh()
+
+        #Verify Default display
+        panel = mayaUtils.activeModelPanel()
+        self.assertSnapshotClose("default" + ".png", self.imageDiffFailThreshold, self.imageDiffFailPercent)
+
+        #Verify look through camera
+        cmds.lookThru( panel, 'persp1' )
+        cmds.refresh()
+        self.assertSnapshotClose("lookThroughCamera" + ".png", self.imageDiffFailThreshold, self.imageDiffFailPercent)
+
+        #Verify look through spot Light
+        cmds.lookThru( panel, 'spotLight1' )
+        cmds.refresh()
+        self.assertSnapshotClose("lookThroughSpotLight" + ".png", self.imageDiffFailThreshold, self.imageDiffFailPercent)
+
+        #Verify look through area light, use a small far clip to clip the scene
+        cmds.lookThru( panel, 'areaLight1', nc=0.0, fc=7.5 )
+        cmds.refresh()
+        self.assertSnapshotClose("lookThroughAreaLight" + ".png", self.imageDiffFailThreshold, self.imageDiffFailPercent)
+
+if __name__ == '__main__':
+    fixturesUtils.runTests(globals())

test/testSamples/testStandardSurface/testStandardSurface.ma

@@ -3,7 +3,6 @@
 //Last modified: Mon, Feb 05, 2024 09:30:35 AM
 //Codeset: 1252
 requires maya "2025ff02";
-requires -nodeType "mayaUsdLayerManager" -dataType "pxrUsdStageData" "mayaUsdPlugin" "0.27.0";
 currentUnit -l centimeter -a degree -t film;
 fileInfo "application" "maya";
 fileInfo "product" "Maya 2025";
@@ -112,9 +111,6 @@ createNode file -n "file1";
 	setAttr ".cs" -type "string" "sRGB";
 createNode place2dTexture -n "place2dTexture1";
 	rename -uid "6616C90D-4B36-08C7-8666-33BB13D15663";
-createNode mayaUsdLayerManager -n "mayaUsdLayerManager1";
-	rename -uid "61CE7C31-4E04-09B7-BFEA-F291A58D7E4C";
-	setAttr ".sst" -type "string" "";
 createNode script -n "uiConfigurationScriptNode";
 	rename -uid "8E0C2C18-4263-5451-E98E-C6B108D65C44";
 	setAttr ".b" -type "string" (