read texture scale and offset from main text in main tex mask mode

TestProjects/PerceptionURP/Assets/Lit.mat

     m_TexEnvs:
     - _BaseMap:
         m_Texture: {fileID: 2800000, guid: 6c6d5e5cce7b447ca891dde4bcf949a2, type: 3}
-        m_Scale: {x: 1, y: 1}
-        m_Offset: {x: 0, y: 0}
+        m_Scale: {x: 1, y: 3.84}
+        m_Offset: {x: 0.36, y: 0}
     - _BumpMap:
         m_Texture: {fileID: 0}
         m_Scale: {x: 1, y: 1}
         m_Offset: {x: 0, y: 0}
     - _MainTex:
         m_Texture: {fileID: 2800000, guid: 6c6d5e5cce7b447ca891dde4bcf949a2, type: 3}
-        m_Scale: {x: 1, y: 1}
-        m_Offset: {x: 0, y: 0}
+        m_Scale: {x: 1, y: 3.84}
+        m_Offset: {x: 0.36, y: 0}
     - _MetallicGlossMap:
         m_Texture: {fileID: 0}
         m_Scale: {x: 1, y: 1}

TestProjects/PerceptionURP/Assets/Scenes/ShaderTests.unity

   m_PrefabAsset: {fileID: 0}
   m_GameObject: {fileID: 963194225}
   m_LocalRotation: {x: 0.18995228, y: 0, z: 0, w: 0.98179334}
-  m_LocalPosition: {x: 76.2, y: 135.9, z: -262.6}
+  m_LocalPosition: {x: 76.2, y: 127.5, z: -241.6}
   m_LocalScale: {x: 36.249973, y: 36.249973, z: 36.249973}
   m_Children: []
   m_Father: {fileID: 0}
   m_EditorClassIdentifier: 
   useSegmentationMask: 1
   segmentationMask: {fileID: 2800000, guid: 474275722ca6a4570bf9773fed7b079d, type: 3}
-  useMainTextureAsSegmask: 0
+  useMainTextureAsSegmask: 1
 --- !u!65 &1762131275
 BoxCollider:
   m_ObjectHideFlags: 0

com.unity.perception/Runtime/GroundTruth/Labelers/Visualization/Materials/SegmentationMaterial.mat

         m_Offset: {x: 0, y: 0}
     m_Floats:
     - _AlphaClip: 1
-    - _BackTransparency: 0.08
+    - _BackTransparency: 0
     - _Blend: 2
     - _BlendOp: 0
     - _BumpScale: 1
     - _QueueOffset: 0
     - _ReceiveShadows: 1
     - _SampleGI: 0
-    - _SegmentTransparency: 1
+    - _SegmentTransparency: 0.8
     - _Shininess: 0
     - _Smoothness: 0.5
     - _SmoothnessSource: 0

com.unity.perception/Runtime/GroundTruth/RenderPasses/CrossPipelinePasses/InstanceSegmentationCrossPipelinePass.cs

             mpb.SetVector(k_SegmentationIdProperty, (Color)color);
 
             Texture mainTex = null;
+            var mainTexSt = new Vector4(1, 1, 0, 0);
-                    mainTex = renderer.material.GetTexture("_MainTex");
+                    var mat = renderer.material;
+                    mainTex = mat.GetTexture("_MainTex");
+                    mainTexSt.x = mat.mainTextureScale.x;
+                    mainTexSt.y = mat.mainTextureScale.y;
+                    mainTexSt.z = mat.mainTextureOffset.x;
+                    mainTexSt.w = mat.mainTextureOffset.y;
+
                     // if (maintex)
                     //     mpb.SetTexture("_MainTex", renderer.material.GetTexture("_MainTex"));
                 }
                         if (mainTex == null)
                             Debug.LogError("No texture found on object");
                         else
+                        {
+                        }
+
+                    mpb.SetVector("_MainTex_ST", mainTexSt);
                 }
                 //mpb.SetFloat("_TransparencyThreshold", segBeh.opacityThreshold);
             }

com.unity.perception/Runtime/GroundTruth/RenderPasses/CrossPipelinePasses/SemanticSegmentationCrossPipelinePass.cs

             mpb.SetVector(k_LabelingId, found ? entry.color : Color.black);
 
             Texture mainTex = null;
+            var mainTexSt = new Vector4(1, 1, 0, 0);
-                    mainTex = renderer.material.GetTexture("_MainTex");
+                    var mat = renderer.material;
+                    mainTex = mat.GetTexture("_MainTex");
+                    mainTexSt.x = mat.mainTextureScale.x;
+                    mainTexSt.y = mat.mainTextureScale.y;
+                    mainTexSt.z = mat.mainTextureOffset.x;
+                    mainTexSt.w = mat.mainTextureOffset.y;
+
                     // if (maintex)
                     //     mpb.SetTexture("_MainTex", renderer.material.GetTexture("_MainTex"));
                 }
                         if (mainTex == null)
                             Debug.LogError("No texture found on object");
                         else
+                        {
+                        }
+
+                    mpb.SetVector("_MainTex_ST", mainTexSt);
                 }
                 //mpb.SetFloat("_TransparencyThreshold", segBeh.opacityThreshold);
             }