1 files changed, 77 insertions, 0 deletions
diff --git a/thirdparty/bullet/BulletCollision/CollisionShapes/btMinkowskiSumShape.cpp b/thirdparty/bullet/BulletCollision/CollisionShapes/btMinkowskiSumShape.cpp
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index 0000000000..899ef50056
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+++ b/thirdparty/bullet/BulletCollision/CollisionShapes/btMinkowskiSumShape.cpp
@@ -0,0 +1,77 @@
+/*
+Bullet Continuous Collision Detection and Physics Library
+Copyright (c) 2003-2009 Erwin Coumans  http://bulletphysics.org
+
+This software is provided 'as-is', without any express or implied warranty.
+In no event will the authors be held liable for any damages arising from the use of this software.
+Permission is granted to anyone to use this software for any purpose, 
+including commercial applications, and to alter it and redistribute it freely, 
+subject to the following restrictions:
+
+1. The origin of this software must not be misrepresented; you must not claim that you wrote the original software. If you use this software in a product, an acknowledgment in the product documentation would be appreciated but is not required.
+2. Altered source versions must be plainly marked as such, and must not be misrepresented as being the original software.
+3. This notice may not be removed or altered from any source distribution.
+*/
+
+
+#include "btMinkowskiSumShape.h"
+
+
+btMinkowskiSumShape::btMinkowskiSumShape(const btConvexShape* shapeA,const btConvexShape* shapeB)
+: btConvexInternalShape (),
+m_shapeA(shapeA),
+m_shapeB(shapeB)
+{
+	m_shapeType = MINKOWSKI_DIFFERENCE_SHAPE_PROXYTYPE;
+	m_transA.setIdentity();
+	m_transB.setIdentity();
+}
+
+btVector3 btMinkowskiSumShape::localGetSupportingVertexWithoutMargin(const btVector3& vec)const
+{
+	btVector3 supVertexA = m_transA(m_shapeA->localGetSupportingVertexWithoutMargin(vec*m_transA.getBasis()));
+	btVector3 supVertexB = m_transB(m_shapeB->localGetSupportingVertexWithoutMargin(-vec*m_transB.getBasis()));
+	return  supVertexA - supVertexB;
+}
+
+void	btMinkowskiSumShape::batchedUnitVectorGetSupportingVertexWithoutMargin(const btVector3* vectors,btVector3* supportVerticesOut,int numVectors) const
+{
+	///@todo: could make recursive use of batching. probably this shape is not used frequently.
+	for (int i=0;i<numVectors;i++)
+	{
+		supportVerticesOut[i] = localGetSupportingVertexWithoutMargin(vectors[i]);
+	}
+
+}
+
+
+
+btScalar	btMinkowskiSumShape::getMargin() const
+{
+	return m_shapeA->getMargin() + m_shapeB->getMargin();
+}
+
+
+void	btMinkowskiSumShape::calculateLocalInertia(btScalar mass,btVector3& inertia) const
+{
+	(void)mass;
+	//inertia of the AABB of the Minkowski sum
+	btTransform identity;
+	identity.setIdentity();
+	btVector3 aabbMin,aabbMax;
+	getAabb(identity,aabbMin,aabbMax);
+
+	btVector3 halfExtents = (aabbMax-aabbMin)*btScalar(0.5);
+
+	btScalar margin = getMargin();
+
+	btScalar lx=btScalar(2.)*(halfExtents.x()+margin);
+	btScalar ly=btScalar(2.)*(halfExtents.y()+margin);
+	btScalar lz=btScalar(2.)*(halfExtents.z()+margin);
+	const btScalar x2 = lx*lx;
+	const btScalar y2 = ly*ly;
+	const btScalar z2 = lz*lz;
+	const btScalar scaledmass = mass * btScalar(0.08333333);
+
+	inertia = scaledmass * (btVector3(y2+z2,x2+z2,x2+y2));
+}