Merge with viewer 3.6.0

1 files changed, 14 insertions, 2 deletions

diff --git a/indra/llappearance/llpolymorph.cpp b/indra/llappearance/llpolymorph.cpp
index 8a17819083..93c2f15a53 100644
--- a/indra/llappearance/llpolymorph.cpp
+++ b/indra/llappearance/llpolymorph.cpp
@@ -597,19 +597,31 @@ void LLPolyMorphTarget::apply( ESex avatar_sex )
 			norm.mul(delta_weight*maskWeight*NORMAL_SOFTEN_FACTOR);
 			scaled_normals[vert_index_mesh].add(norm);
 			norm = scaled_normals[vert_index_mesh];
+
+			// guard against degenerate input data before we create NaNs below!
+			//
 			norm.normalize3fast();
 			normals[vert_index_mesh] = norm;
 
 			// calculate new binormals
 			LLVector4a binorm = mMorphData->mBinormals[vert_index_morph];
+
+			// guard against degenerate input data before we create NaNs below!
+			//
+			if (!binorm.isFinite3() || (binorm.dot3(binorm).getF32() <= F_APPROXIMATELY_ZERO))
+			{
+				binorm.set(1,0,0,1);
+			}
+
 			binorm.mul(delta_weight*maskWeight*NORMAL_SOFTEN_FACTOR);
 			scaled_binormals[vert_index_mesh].add(binorm);
 			LLVector4a tangent;
 			tangent.setCross3(scaled_binormals[vert_index_mesh], norm);
 			LLVector4a& normalized_binormal = binormals[vert_index_mesh];
-			normalized_binormal.setCross3(norm, tangent); 
+
+			normalized_binormal.setCross3(norm, tangent); 			
 			normalized_binormal.normalize3fast();
-			
+
 			tex_coords[vert_index_mesh] += mMorphData->mTexCoords[vert_index_morph] * delta_weight * maskWeight;
 		}