Bugfix: Wrong default T in SfMCameras

Summary: Fixes a bug that initializes default SfMCameras with a default _R instead of default _T

Reviewed By: gkioxari

Differential Revision: D23654583

fbshipit-source-id: ccfb7235b2fb6df5a2e402b9fb4b194e97d78dc6

pytorch3d/renderer/cameras.py

@@ -688,7 +688,7 @@ we assume the parameters are in screen space.
 
 
 def SfMPerspectiveCameras(
-    focal_length=1.0, principal_point=((0.0, 0.0),), R=_R, T=_R, device="cpu"
+    focal_length=1.0, principal_point=((0.0, 0.0),), R=_R, T=_T, device="cpu"
 ):
     """
     SfMPerspectiveCameras has been DEPRECATED. Use PerspectiveCameras instead.