Update train_ngp_nerf.py

examples/train_ngp_nerf.py

@@ -200,7 +200,7 @@ if __name__ == "__main__":
                         t * args.cone_angle, min=render_step_size
                     )
                     # filter out the points that are not in the near far plane.
-                    if (near_plane is not None) and (near_plane is not None):
+                    if (near_plane is not None) and (far_plane is not None):
                         step_size = torch.where(
                             (t > near_plane) & (t < far_plane),
                             step_size,