#5159 Fix Animated textures freeze

Negative near zero radius was resulting in 0 return.
Might need to cover negative values in general.

1 files changed, 5 insertions, 1 deletions

diff --git a/indra/newview/llface.cpp b/indra/newview/llface.cpp
index f08ef8d24a..7c631a7280 100644
--- a/indra/newview/llface.cpp
+++ b/indra/newview/llface.cpp
@@ -2378,7 +2378,11 @@ F32 LLFace::adjustPartialOverlapPixelArea(F32 cos_angle_to_view_dir, F32 radius
 
         //the above calculation is too expensive
         //the below is a good estimation: bounding box of the bounding sphere:
-        F32 alpha = 0.5f * (radius + screen_radius - d) / radius ;
+        F32 alpha = 1.f;
+        if (!is_approx_zero(radius)) // radius can be something like -1e-10
+        {
+            alpha = 0.5f * (radius + screen_radius - d) / radius;
+        }
         alpha = llclamp(alpha, 0.f, 1.f) ;
         return alpha * alpha ;
     }