I got a problem while tryng to import Bullet in my custom Engine and couldn't find a solution searching around
so i decided to ask Here it's my code for checking Frustum culling:
It implements a Class that is supposed to fill an array of all the visible objects for future uses
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class REDER_CAMERA_FRUSTUM_CULLER
{
public:
REDER_CAMERA_FRUSTUM_CULLER();
~REDER_CAMERA_FRUSTUM_CULLER();
void performFrustumCulling(REDER_CAMERA *cm); // Fills m_objectsInFrustum
btAlignedObjectArray<btCollisionObject*> m_objectsInFrustum;
};
//Implementation
REDER_CAMERA_FRUSTUM_CULLER::REDER_CAMERA_FRUSTUM_CULLER()
{
}
REDER_CAMERA_FRUSTUM_CULLER::~REDER_CAMERA_FRUSTUM_CULLER()
{
}
// Main stuct for btDbvt handling
struct DbvtBroadphaseFrustumCulling : btDbvt::ICollide
{
btAlignedObjectArray<btCollisionObject*>* m_pCollisionObjectArray;
short int m_collisionFilterMask;
btCollisionObject* m_additionalCollisionObjectToExclude; // Unused in this demo
DbvtBroadphaseFrustumCulling(btAlignedObjectArray<btCollisionObject*>* _pArray=NULL)
: m_pCollisionObjectArray(_pArray),m_collisionFilterMask(btBroadphaseProxy::AllFilter & ~btBroadphaseProxy::SensorTrigger),m_additionalCollisionObjectToExclude(NULL)
{
}
void Process(const btDbvtNode* node,btScalar depth)
{
Process(node);
}
void Process(const btDbvtNode* leaf)
{
btBroadphaseProxy* proxy=static_cast < btBroadphaseProxy*> (leaf->data);
btCollisionObject* co = static_cast < btCollisionObject* > (proxy->m_clientObject);
if ((proxy->m_collisionFilterGroup & m_collisionFilterMask) != 0 && co != m_additionalCollisionObjectToExclude)
{
m_pCollisionObjectArray->push_back( co );
}
}
}g_DBFC;
// This fills m_objectsInFrustum:
void REDER_CAMERA_FRUSTUM_CULLER::performFrustumCulling(REDER_CAMERA *cm)
{
m_objectsInFrustum.resize(0); // clear() is probably slower
btDbvtBroadphase* dbvtBroadphase = (btDbvtBroadphase *)EngineMainWorldHandler.mPhysicsCache;
D3DXMATRIX viewProjection;
D3DXMatrixMultiply( &viewProjection, &cm->view, &cm->projection );
//D3DXMatrixMultiply( &viewProjection, &m_mView, &m_mProjection );
// Left plane
D3DXPLANE m_frustum[6];
m_frustum[0].a = viewProjection._14 + viewProjection._11;
m_frustum[0].b = viewProjection._24 + viewProjection._21;
m_frustum[0].c = viewProjection._34 + viewProjection._31;
m_frustum[0].d = viewProjection._44 + viewProjection._41;
// Right plane
m_frustum[1].a = viewProjection._14 - viewProjection._11;
m_frustum[1].b = viewProjection._24 - viewProjection._21;
m_frustum[1].c = viewProjection._34 - viewProjection._31;
m_frustum[1].d = viewProjection._44 - viewProjection._41;
// Top plane
m_frustum[2].a = viewProjection._14 - viewProjection._12;
m_frustum[2].b = viewProjection._24 - viewProjection._22;
m_frustum[2].c = viewProjection._34 - viewProjection._32;
m_frustum[2].d = viewProjection._44 - viewProjection._42;
// Bottom plane
m_frustum[3].a = viewProjection._14 + viewProjection._12;
m_frustum[3].b = viewProjection._24 + viewProjection._22;
m_frustum[3].c = viewProjection._34 + viewProjection._32;
m_frustum[3].d = viewProjection._44 + viewProjection._42;
// Near plane
m_frustum[4].a = viewProjection._13;
m_frustum[4].b = viewProjection._23;
m_frustum[4].c = viewProjection._33;
m_frustum[4].d = viewProjection._43;
// Far plane
m_frustum[5].a = viewProjection._14 - viewProjection._13;
m_frustum[5].b = viewProjection._24 - viewProjection._23;
m_frustum[5].c = viewProjection._34 - viewProjection._33;
m_frustum[5].d = viewProjection._44 - viewProjection._43;
// Normalize planes
btVector3 planes_n[5];
btScalar planes_o[5];
for ( int i = 0; i < 5; i++)
{
D3DXPlaneNormalize( &m_frustum[i], &m_frustum[i] );
planes_n[i] = btVector3(m_frustum[i].a,m_frustum[i].b,m_frustum[i].c);
planes_o[i] = m_frustum[i].d;
}
btVector3 dir(cm->cameraDirNormalized.x,cm->cameraDirNormalized.y,cm->cameraDirNormalized.z);
g_DBFC.m_pCollisionObjectArray = &m_objectsInFrustum;
g_DBFC.m_collisionFilterMask = btBroadphaseProxy::AllFilter & ~btBroadphaseProxy::SensorTrigger;//btBroadphaseProxy::AllFilter & ~btBroadphaseProxy::SensorTrigger; // This won't display sensors...
g_DBFC.m_additionalCollisionObjectToExclude = NULL;//btCamera;
btDbvt::collideOCL(dbvtBroadphase->m_sets[1].m_root,planes_n,planes_o,dir,5,g_DBFC);
btDbvt::collideOCL(dbvtBroadphase->m_sets[0].m_root,planes_n,planes_o,dir,5,g_DBFC);
// traverse the tree and call ICollide::Process(node) for all leaves located inside/on a set of planes.
// End Perform Frustum Culling
}
and this is the code i'm using to add elements to the scene
static terrain:
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for(unsigned int y = 0;y < md->Mesh_Vec[i].num_ind;y+=3)
{
btVector3 t1(vp[vm->IndexBoneBuffer[y]].x,vp[vm->IndexBoneBuffer[y]].y,vp[vm->IndexBoneBuffer[y]].z);
btVector3 t2(vp[vm->IndexBoneBuffer[y + 1]].x,vp[vm->IndexBoneBuffer[y + 1]].y,vp[vm->IndexBoneBuffer[y + 1]].z);
btVector3 t3(vp[vm->IndexBoneBuffer[y + 2]].x,vp[vm->IndexBoneBuffer[y + 2]].y,vp[vm->IndexBoneBuffer[y + 2]].z);
data->addTriangle(t1,t2,t3,false);
}
btBvhTriangleMeshShape* terrainShape=new btBvhTriangleMeshShape(data,true,true);
//by default phisic is set to not moving no mass
btTransform startTransform;
startTransform.setIdentity();
startTransform.setFromOpenGLMatrix((btScalar*)md->Mesh_Vec[i].start_trasform.m);
btDefaultMotionState* ms = new btDefaultMotionState(startTransform);
btVector3 localInertia(0,0,0);
btRigidBody::btRigidBodyConstructionInfo rbInfo(0.0f,ms,md->Mesh_Vec[i].terrainShape,localInertia);
btRigidBody* body = new btRigidBody(rbInfo);
body->setActivationState(ACTIVE_TAG);
body->setCollisionFlags(btCollisionObject::CF_STATIC_OBJECT);
EngineMainWorldHandler.mPhysicsWorld->addRigidBody(body);
and models
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btTransform startTransform;
startTransform.setIdentity();
startTransform.setFromOpenGLMatrix((btScalar*)place);
btDefaultMotionState* ms = new btDefaultMotionState(startTransform);
btVector3 localInertia(inertia->x,inertia->y,inertia->z);
btRigidBody::btRigidBodyConstructionInfo rbInfo(mass,ms,EngineMainWorldHandler.ModelsInstances[posInstance]->origin_model->ModelBoxShape,localInertia);
btRigidBody* body = new btRigidBody(rbInfo);
body->setActivationState(ACTIVE_TAG);
body->setCollisionFlags(btCollisionObject::CF_KINEMATIC_OBJECT);
EngineMainWorldHandler.mPhysicsWorld->addRigidBody(body);
EngineMainWorldHandler.ModelsInstances[posInstance]->body = body;
Hope someone can help me
i get an exception if i try to add static terrain, precisally when creating the collision mesh too
(line: btBvhTriangleMeshShape* terrainShape=new btBvhTriangleMeshShape(data,true,true);)
and if i try to add a model(Using BB) all goes right but simply no object results in the frustum(tried many test cases,seems that nothing passes the test
)