// recalc aabbs
Transform convexInTriangleSpace = Stack.alloc(Transform.class);
triBody.getWorldTransform(convexInTriangleSpace);
convexInTriangleSpace.inverse();
convexInTriangleSpace.mul(convexBody.getWorldTransform(Stack.alloc(Transform.class)));
CollisionShape convexShape = (CollisionShape)convexBody.getCollisionShape();
//CollisionShape* triangleShape = static_cast<btCollisionShape*>(triBody->m_collisionShape);
convexShape.getAabb(convexInTriangleSpace, aabbMin, aabbMax);
float extraMargin = collisionMarginTriangle;