Merge remote-tracking branch 'yliu/fix-omniverse' into fix-omniverse

Author: KumoLiu

modules/omniverse/omniverse_integration.ipynb

@@ -577,7 +577,7 @@
     "\n",
     "To download the latest version of USD Composer, you can follow the instructions here to build and launch:\n",
     "\n",
-    "https://github.com/NVIDIA-Omniverse/kit-app-template/tree/main/templates/apps/usd_composer#getting-started.\n",
+    "https://github.com/NVIDIA-Omniverse/kit-app-template/tree/main/templates/apps/usd_composer#getting-started\n",
     "\n",
     "![omniverse](./omniverse.png)"
    ]

modules/omniverse/utility.py

@@ -204,35 +204,37 @@ def convert_mesh_to_usd(input_file, output_file):
                 # Create a unique path for each mesh
                 node_path = f"/World/{node_name}"
                 xform = UsdGeom.Xform.Define(stage, node_path)
+                # Define the Mesh under the Xform
+                mesh_path = f"{node_path}/Mesh"
+                usd_mesh = UsdGeom.Mesh.Define(stage, mesh_path)
                 # get the geometry of the node
                 geometry = mesh.geometry[geom_name]
-                usd_mesh = UsdGeom.Mesh.Define(stage, node_path)
 
                 # Create a random color for this mesh
                 # Using HSV for better color distribution
                 h = random.random()  # Random hue
                 s = 0.7 + 0.3 * random.random()  # Saturation between 0.7-1.0
                 v = 0.7 + 0.3 * random.random()  # Value between 0.7-1.0
                 r, g, b = colorsys.hsv_to_rgb(h, s, v)
-                
+
                 # Create a material with the random color
                 mat_name = f"{node_name}_material"
                 mat_path = f"{materials_path}/{mat_name}"
                 material = UsdShade.Material.Define(stage, mat_path)
-                
+
                 # Create shader
                 shader = UsdShade.Shader.Define(stage, f"{mat_path}/PreviewSurface")
                 shader.CreateIdAttr("UsdPreviewSurface")
-                
+
                 # Set the random color
                 shader.CreateInput("diffuseColor", Sdf.ValueTypeNames.Color3f).Set(Gf.Vec3f(r, g, b))
                 shader.CreateInput("roughness", Sdf.ValueTypeNames.Float).Set(0.4)
-                
+
                 # Connect shader to material
                 material_output = material.CreateOutput("surface", Sdf.ValueTypeNames.Token)
                 shader_output = shader.CreateOutput("surface", Sdf.ValueTypeNames.Token)
                 material_output.ConnectToSource(shader_output)
-                
+
                 # Bind material to mesh
                 UsdShade.MaterialBindingAPI(usd_mesh).Bind(material)