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diff --git a/indra/llmath/llmatrix4a.cpp b/indra/llmath/llmatrix4a.cpp
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+++ b/indra/llmath/llmatrix4a.cpp
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+/**
+* @file llmatrix4a.cpp
+* @brief  Functions for vectorized matrix/vector operations
+*
+* $LicenseInfo:firstyear=2018&license=viewerlgpl$
+* Second Life Viewer Source Code
+* Copyright (C) 2018, Linden Research, Inc.
+*
+* This library is free software; you can redistribute it and/or
+* modify it under the terms of the GNU Lesser General Public
+* License as published by the Free Software Foundation;
+* version 2.1 of the License only.
+*
+* This library is distributed in the hope that it will be useful,
+* but WITHOUT ANY WARRANTY; without even the implied warranty of
+* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+* Lesser General Public License for more details.
+*
+* You should have received a copy of the GNU Lesser General Public
+* License along with this library; if not, write to the Free Software
+* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+*
+* Linden Research, Inc., 945 Battery Street, San Francisco, CA  94111  USA
+* $/LicenseInfo$
+*/
+
+#include "llmath.h"
+#include "llmatrix4a.h"
+
+// Convert a bounding box into other coordinate system. Should give
+// the same results as transforming every corner of the bounding box
+// and extracting the bounding box of that, although that's not
+// necessarily the fastest way to implement.
+void matMulBoundBox(const LLMatrix4a &mat, const LLVector4a *in_extents, LLVector4a *out_extents)
+{
+		//get 8 corners of bounding box
+		LLVector4Logical mask[6];
+
+		for (U32 i = 0; i < 6; ++i)
+		{
+			mask[i].clear();
+		}
+
+		mask[0].setElement<2>(); //001
+		mask[1].setElement<1>(); //010
+		mask[2].setElement<1>(); //011
+		mask[2].setElement<2>();
+		mask[3].setElement<0>(); //100
+		mask[4].setElement<0>(); //101
+		mask[4].setElement<2>();
+		mask[5].setElement<0>(); //110
+		mask[5].setElement<1>();
+
+		LLVector4a v[8];
+
+		v[6] = in_extents[0];
+		v[7] = in_extents[1];
+
+		for (U32 i = 0; i < 6; ++i)
+		{
+			v[i].setSelectWithMask(mask[i], in_extents[0], in_extents[1]);
+		}
+
+		LLVector4a tv[8];
+
+		//transform bounding box into drawable space
+		for (U32 i = 0; i < 8; ++i)
+		{
+			mat.affineTransform(v[i], tv[i]);
+		}
+	
+		//find bounding box
+		out_extents[0] = out_extents[1] = tv[0];
+
+		for (U32 i = 1; i < 8; ++i)
+		{
+			out_extents[0].setMin(out_extents[0], tv[i]);
+			out_extents[1].setMax(out_extents[1], tv[i]);
+		}
+}