From ea8521ac3894a756811e5d5f7fac7234fe764c35 Mon Sep 17 00:00:00 2001
From: Mark Harris <mharris@nvidia.com>
Date: Thu, 27 Nov 2025 13:21:00 +1100
Subject: [PATCH] Invert !mAbsGrad

Signed-off-by: Mark Harris <mharris@nvidia.com>
---
 src/fvdb/detail/ops/gsplat/GaussianRasterizeBackward.cu | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/fvdb/detail/ops/gsplat/GaussianRasterizeBackward.cu b/src/fvdb/detail/ops/gsplat/GaussianRasterizeBackward.cu
index 098c2278..cc1103c4 100644
--- a/src/fvdb/detail/ops/gsplat/GaussianRasterizeBackward.cu
+++ b/src/fvdb/detail/ops/gsplat/GaussianRasterizeBackward.cu
@@ -504,7 +504,7 @@ struct RasterizeBackwardArgs {
         outMean2dGradientContribution = {
             sigmaGradientContribution * (conic[0] * delta[0] + conic[1] * delta[1]),
             sigmaGradientContribution * (conic[1] * delta[0] + conic[2] * delta[1])};
-        if (!mAbsGrad) {
+        if (mAbsGrad) {
             outMean2dAbsGradientContribution = {abs(outMean2dGradientContribution[0]),
                                                 abs(outMean2dGradientContribution[1])};
         }