public BulletDotNETScene(string sceneIdentifier)
{
// m_sceneIdentifier = sceneIdentifier;
VectorZero = new btVector3(0, 0, 0);
QuatIdentity = new btQuaternion(0, 0, 0, 1);
TransZero = new btTransform(QuatIdentity, VectorZero);
m_gravity = new btVector3(0, 0, gravityz);
_origheightmap = new float[(int)Constants.RegionSize * (int)Constants.RegionSize];
}