From 32d3d2e0503ef81a7d1e40f7e7464ca6743d540f Mon Sep 17 00:00:00 2001
From: "Brad Payne (Vir Linden)" <vir@lindenlab.com>
Date: Thu, 20 Jan 2011 14:49:05 -0500
Subject: SH-749 FIX: check for zero-extent to avoid div by zero

---
 indra/llprimitive/llmodel.cpp | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/indra/llprimitive/llmodel.cpp b/indra/llprimitive/llmodel.cpp
index 1869e1dd47..3d03209eaf 100755
--- a/indra/llprimitive/llmodel.cpp
+++ b/indra/llprimitive/llmodel.cpp
@@ -950,6 +950,25 @@ void LLModel::normalizeVolumeFaces()
 		LLVector4a size;
 		size.setSub(max, min);
 
+		// Prevent division by zero.
+		F32 x = size[0];
+		F32 y = size[1];
+		F32 z = size[2];
+		F32 w = size[3];
+		if (fabs(x)<F_APPROXIMATELY_ZERO)
+		{
+			x = 1.0;
+		}
+		if (fabs(y)<F_APPROXIMATELY_ZERO)
+		{
+			y = 1.0;
+		}
+		if (fabs(z)<F_APPROXIMATELY_ZERO)
+		{
+			z = 1.0;
+		}
+		size.set(x,y,z,w);
+
 		// Compute scale as reciprocal of size
 		LLVector4a scale;
 		scale.splat(1.f);
-- 
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