Engine directory for ticket #1

Engine/source/util/triBoxCheck.h

@@ -0,0 +1,53 @@
+//-----------------------------------------------------------------------------
+// Copyright (c) 2012 GarageGames, LLC
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to
+// deal in the Software without restriction, including without limitation the
+// rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+// sell copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+// IN THE SOFTWARE.
+//-----------------------------------------------------------------------------
+
+//-----------------------------------------------------------------------------
+// AABB-triangle overlap test code originally by Tomas Akenine-Möller
+//               Assisted by Pierre Terdiman and David Hunt
+// http://www.cs.lth.se/home/Tomas_Akenine_Moller/code/
+// Ported to TSE by BJG, 2005-4-14
+// Modified to avoid a lot of copying by ASM, 2007-9-28
+//-----------------------------------------------------------------------------
+
+#ifndef _TRIBOXCHECK_H_
+#define _TRIBOXCHECK_H_
+
+#include "math/mPoint3.h"
+#include "math/mBox.h"
+
+bool triBoxOverlap(const Point3F &boxcenter, const Point3F &boxhalfsize, const Point3F triverts[3]);
+
+/// Massage stuff into right format for triBoxOverlap test. This is really
+/// just a helper function - use the other version if you want to be fast!
+inline bool triBoxOverlap(Box3F box, Point3F a, Point3F b, Point3F c)
+{
+   Point3F halfSize(box.len_x() / 2.f, box.len_y() / 2.f, box.len_z() / 2.f);
+
+   Point3F center;
+   box.getCenter(&center);
+
+   Point3F verts[3] = {a,b,c};
+
+   return triBoxOverlap(center, halfSize, verts);
+}
+
+#endif