From 8c41a263b8c9aaba2ed242d0abaf03480a50eb1d Mon Sep 17 00:00:00 2001
From: Matthew Tancik <tancik@berkeley.edu>
Date: Fri, 27 Jan 2023 13:56:19 -0800
Subject: [PATCH] Fix normal orientation loss (#1298)

Co-authored-by: Abhik Ahuja <ahujaabhik@berkeley.edu>
---
 nerfstudio/model_components/losses.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/nerfstudio/model_components/losses.py b/nerfstudio/model_components/losses.py
index 9624ad02d..7fcfe0419 100644
--- a/nerfstudio/model_components/losses.py
+++ b/nerfstudio/model_components/losses.py
@@ -193,7 +193,7 @@ def orientation_loss(
     """
     w = weights
     n = normals
-    v = viewdirs
+    v = viewdirs * -1
     n_dot_v = (n * v[..., None, :]).sum(axis=-1)
     return (w[..., 0] * torch.fmin(torch.zeros_like(n_dot_v), n_dot_v) ** 2).sum(dim=-1)