HAVOK只碰撞一个shape的一面

这里我只针对hkpTriangleShape, 当然这包括包含这类型的shape集合

这里我使用的是hkpContactListener，对反面的碰撞使用枚举hkContactPointMaterial::CONTACT_IS_DISABLED，去除相关的碰撞

重载contactPointCallback( const hkpContactPointEvent& event )

一般要遍历得对应的shape后，用weld的构造方向求法线（默认是反时钟方向），再点积下碰撞法线就好了

例如：

[cpp] view
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hkpShapeKeyPath path( event, 1 - event.m_source );

hkpShapeKeyPath::Iterator it = path.getIterator();

while (it.isValid()){

const hkpShape* curShape = it.getShape();

if( curShape ->getType() == hkcdShapeType::TRIANGLE ){

hkpShapeKey* key = event.getShapeKeys( 1 -event.m_source );

const hkpTriangleShape* triangle = static_cast<const hkpTriangleShape*>( curShape );

hkVector4 a, b, n;

a.setSub( triangle->getVertex(1), triangle->getVertex(0) );

b.setSub( triangle->getVertex(2), triangle->getVertex(1) );

n.setCross( a, b );

if( n.dot3(event.m_contactPoint ->getNormal()) < .0f ){

event.m_contactPointProperties->m_flags |= hkContactPointMaterial::CONTACT_IS_DISABLED;

return;

}

}