Adding logic to include meshes using MjModel

python/mujoco/usd_utilities.py

@@ -0,0 +1,8 @@
+
+def get_mesh_ranges(nmesh, arr):
+    mesh_ranges = [0]
+    running_sum = 0
+    for i in range(nmesh):
+        running_sum += arr[i]
+        mesh_ranges.append(running_sum)
+    return mesh_ranges