Exclude Heightmap to my collision test

[Furya]

Hi,

I use a BtGhostObject for my character and i want that my BtGhostObject collide with rigidBody and others BtGhostObject
so I try the collision test here http://www.bulletphysics.org/mediawiki- ... d_Triggers (2) btGhostObject).

It works but the collision test always give me Heightmap when i do manifold->getBody1(). there is already collision between BtGostObject and Heightmap so I want to exclude Heightmap from that test.

I try this:

Code: Select all

for (int j = 0; j<m_manifoldArray.size(); j++)
		{
			btPersistentManifold* manifold = m_manifoldArray[j];
			btScalar directionSign = manifold->getBody0() == m_ghostObject ? btScalar(-1.0) : btScalar(1.0);
			
			std::string *str = (std::string*)manifold->getBody1()->getCollisionShape()->getUserPointer();

			if (*str!= "Heightmap"){

				for (int p = 0; p < manifold->getNumContacts(); p++)
				{
					const btManifoldPoint&pt = manifold->getContactPoint(p);

					if (pt.getDistance() < 0.f)
					{
						const btVector3& ptA = pt.getPositionWorldOnA();
						const btVector3& ptB = pt.getPositionWorldOnB();
						const btVector3& normalOnB = pt.m_normalWorldOnB;

						//Move character out of intersection
						btVector3 pos = m_ghostObject->getWorldTransform().getOrigin();

						pos -= btVector3(0, pt.getDistance(), 0);
						pos *= pt.m_normalWorldOnB;

						m_ghostObject->getWorldTransform().setOrigin(btVector3(pos.x(), m_ghostObject->getWorldTransform().getOrigin().y(), pos.z()));
					}
				}

			}
		}

.. but it doesn't work.

I thought about to use collision mask but I don't want my BtGhostObject cross throught the ground.
So what is the solution ?

A++

[Furya]

Ok I use collision filtering. It works !