fix: os.path.join used for USD prim paths breaks on Windows

[andrewwhitecdw]

This PR addresses the following issue in exts/omni.ext.mobility_gen/omni/ext/mobility_gen/utils/occupancy_map_utils.py: os.path.join used for USD prim paths breaks on Windows.

Changes

• exts/omni.ext.mobility_gen/omni/ext/mobility_gen/utils/occupancy_map_utils.py: os.path.join used for USD prim paths breaks on Windows.

Details

--- a/exts/omni.ext.mobility_gen/omni/ext/mobility_gen/utils/occupancy_map_utils.py
+++ b/exts/omni.ext.mobility_gen/omni/ext/mobility_gen/utils/occupancy_map_utils.py
@@ -127,7 +127,6 @@ async def occupancy_map_generate_from_prim_async(
 
     # Compute bounds for occupancy map calculation using specified prim
-    prim_path = os.path.join(prim_path)
     prim_path = stage.GetPrimAtPath(prim_path)
 
     lower_bound, upper_bound, midpoint = prim_compute_bbox(prim_path)
@@ -218,7 +217,7 @@ def occupancy_map_add_to_stage(
     modelRoot = UsdGeom.Xform.Define(stage, path)
     Usd.ModelAPI(modelRoot).SetKind(Kind.Tokens.component)
 
     # Add mesh
-    mesh = UsdGeom.Mesh.Define(stage, os.path.join(path, "mesh"))
+    mesh = UsdGeom.Mesh.Define(stage, f"{path}/mesh")
     mesh.CreatePointsAttr([(x0, y0, z_offset), (x1, y0, z_offset), (x1, y1, z_offset), (x0, y1, z_offset)])
     mesh.CreateFaceVertexCountsAttr([4])
     mesh.CreateFaceVertexIndicesAttr([0,1,2,3])
@@ -229,18 +228,18 @@ def occupancy_map_add_to_stage(
     texCoords.Set([(0, 0), (1, 0), (1,1), (0, 1)])
 
     # Add material
-    material_path = os.path.join(path, "material")
+    material_path = f"{path}/material"
     material = UsdShade.Material.Define(stage, material_path)
-    pbrShader = UsdShade.Shader.Define(stage, os.path.join(material_path, "shader"))
+    pbrShader = UsdShade.Shader.Define(stage, f"{material_path}/shader")
     pbrShader.CreateIdAttr("UsdPreviewSurface")
     pbrShader.CreateInput("roughness", Sdf.ValueTypeNames.Float).Set(1.0)
     pbrShader.CreateInput("metallic", Sdf.ValueTypeNames.Float).Set(0.0)
     material.CreateSurfaceOutput().ConnectToSource(pbrShader.ConnectableAPI(), "surface")
 
     # Add texture to material
-    stReader = UsdShade.Shader.Define(stage, os.path.join(material_path, "st_reader"))
+    stReader = UsdShade.Shader.Define(stage, f"{material_path}/st_reader")
     stReader.CreateIdAttr('UsdPrimvarReader_float2')
-    diffuseTextureSampler = UsdShade.Shader.Define(stage, os.path.join(material_path, "diffuse_texture"))
+    diffuseTextureSampler = UsdShade.Shader.Define(stage, f"{material_path}/diffuse_texture")
     diffuseTextureSampler.CreateIdAttr('UsdUVTexture')
     diffuseTextureSampler.CreateInput('file', Sdf.ValueTypeNames.Asset).Set(image_path)
     diffuseTextureSampler.CreateInput("st", Sdf.ValueTypeNames.Float2).ConnectToSource(stReader.ConnectableAPI(), 'result')