validate sampling_mode

Summary: New sampling mode option in TexturesUV mush match when collating meshes.

Reviewed By: patricklabatut

Differential Revision: D33235901

fbshipit-source-id: f457473d90bf022e65fe122ef45bf5efad134345

pytorch3d/renderer/mesh/textures.py

@@ -1061,6 +1061,11 @@ def join_batch(self, textures: List["TexturesUV"]) -> "TexturesUV":
         )
         if not align_corners_same:
             raise ValueError("All textures must have the same align_corners value.")
+        sampling_mode_same = all(
+            tex.sampling_mode == self.sampling_mode for tex in textures
+        )
+        if not sampling_mode_same:
+            raise ValueError("All textures must have the same sampling_mode.")
 
         verts_uvs_list = []
         faces_uvs_list = []