void RigidBody::CreateBody()
{
if (!impl->world || impl->body || !ParentEntity())
return;
CheckForPlaceableAndTerrain();
CreateCollisionShape();
btVector3 localInertia;
float m;
int collisionFlags;
impl->GetProperties(localInertia, m, collisionFlags);
impl->body = new btRigidBody(m, impl, impl->shape, localInertia);
// TEST: Adjust the threshold of when to sleep the object - for reducing network bandwidth.
// impl->body->setSleepingThresholds(0.2f, 0.5f); // Bullet defaults are 0.8 and 1.0.
impl->body->setUserPointer(this);
impl->body->setCollisionFlags(collisionFlags);
impl->world->BulletWorld()->addRigidBody(impl->body, (short)collisionLayer.Get(), (short)collisionMask.Get());
impl->body->activate();
UpdateGravity();
}
/**
* Scene_Container owns this method because I, Dylan, have made an executive decision to make lights bound to
* the laws of physics impossible; I see no point for it (except for flashlights maybe). Our lights will be static,
* so the initialization of rigid bodies can be the sole responsibility of the Scene_Container, because it knows
* about all of its own vertices.
*
* TODO: Support more than just Convex Hull Shape for collision detection; Triangle Mesh Shape might be more
* appropriate for static game objects.
**/
void Scene_Container::InitRigidBody(btScalar mass)
{
// Create the collision shape
CreateCollisionShape();
btVector3 localInertia(0, 0, 0);
isDynamic = (mass != 0.f);
if (isDynamic)
collisionShape->calculateLocalInertia(mass, localInertia);
btTransform* transform = new btTransform(
btQuaternion(this->transform.rotation.x,
this->transform.rotation.y,
this->transform.rotation.z,
this->transform.rotation.w),
btVector3(this->transform.position.x,
this->transform.position.y,
this->transform.position.z));
btRigidBody::btRigidBodyConstructionInfo rigidBodyCI(
mass,
new btDefaultMotionState(*transform),
collisionShape,
localInertia);
rigidBody = new btRigidBody(rigidBodyCI);
rigidBody->setUserPointer(this);
Physics_Manager::GetInstance()->AddRigidBody(rigidBody);
}
int CcdChapter::Init()
{
CreateScene();
// load resource
LoadResource();
CreateBullet();
Plane plane(Vector3::UNIT_Y, 0);
MeshManager::getSingleton().createPlane("ground", ResourceGroup, plane, 500, 500, 1, 1, true, 1, 5, 5, Vector3::UNIT_Z);
Entity *groundEntity = m_pkSceneManager->createEntity("GroundEntity", "ground");
groundEntity->setMaterialName("BulletPlane", ResourceGroup);
groundEntity->setCastShadows(true);
SceneNode *pkNode = m_pkRootNode->createChildSceneNode();
pkNode->attachObject(groundEntity);
btCollisionShape *shape = CreateCollisionShape(SHAPE_TYPE::SHAPE_PLANE, Vector3::ZERO);
m_CollisionShapes.push_back(shape);
btRigidBody *body = CreateRigidBody(shape, false, pkNode, 100);
m_RigidBodies.push_back(body);
m_pkDynamicsWorld->addRigidBody(body);
body->setUserPointer(pkNode);
//body->setFriction(100);
return 0;
}
void RigidBody::TerrainUpdated(IAttribute* attribute, AttributeChange::Type /*change*/)
{
Terrain* terrain = impl->terrain;
if (!terrain)
return;
/// \todo It is suboptimal to regenerate the whole heightfield when just the terrain's transform changes
if (attribute == &terrain->nodeTransformation && shapeType.Get() == HeightField)
CreateCollisionShape();
}
void RigidBody::OnCollisionMeshAssetLoaded(AssetPtr asset)
{
IMeshAsset* meshAsset = dynamic_cast<IMeshAsset*>(asset.Get());
if (!meshAsset)
LogError("RigidBody::OnCollisionMeshAssetLoaded: Mesh asset load finished for asset \"" +
asset->Name() + "\", but asset pointer was null!");
if (shapeType.Get() == TriMesh)
{
impl->triangleMesh = impl->owner->GetTriangleMeshFromMeshAsset(meshAsset);
CreateCollisionShape();
}
else if (shapeType.Get() == ConvexHull)
{
impl->convexHullSet = impl->owner->GetConvexHullSetFromMeshAsset(meshAsset);
CreateCollisionShape();
}
impl->cachedShapeType = shapeType.Get();
impl->cachedSize = size.Get();
}
void RigidBody::AttributesChanged()
{
if (impl->disconnected)
return;
bool isShapeTriMeshOrConvexHull = (shapeType.Get() == TriMesh || shapeType.Get() == ConvexHull);
bool bodyRead = false;
bool meshRequested = false;
// Create body now if does not exist yet
if (!impl->body)
CreateBody();
// If body was not created (we do not actually have a physics world), exit
if (!impl->body)
return;
if (mass.ValueChanged() || collisionLayer.ValueChanged() || collisionMask.ValueChanged())
{
// Read body to the world in case static/dynamic classification changed, or if collision mask changed
ReaddBody();
bodyRead = true;
}
if (friction.ValueChanged())
impl->body->setFriction(friction.Get());
if (rollingFriction.ValueChanged())
impl->body->setRollingFriction(rollingFriction.Get());
if (restitution.ValueChanged())
impl->body->setRestitution(friction.Get());
if (linearDamping.ValueChanged() || angularDamping.ValueChanged())
impl->body->setDamping(linearDamping.Get(), angularDamping.Get());
if (linearFactor.ValueChanged())
impl->body->setLinearFactor(linearFactor.Get());
if (angularFactor.ValueChanged())
impl->body->setAngularFactor(angularFactor.Get());
if (shapeType.ValueChanged() || size.ValueChanged())
{
if (shapeType.Get() != impl->cachedShapeType || !size.Get().Equals(impl->cachedSize))
{
// If shape does not involve mesh, can create it directly. Otherwise request the mesh
if (!isShapeTriMeshOrConvexHull)
{
CreateCollisionShape();
impl->cachedShapeType = shapeType.Get();
impl->cachedSize = size.Get();
}
// If shape type has changed from TrimMesh <--> ConvexHull refresh the mesh shape.
else if (shapeType.Get() != impl->cachedShapeType)
{
RequestMesh();
meshRequested = true;
}
// If size changed but no reload of mesh shape was done, update its scale.
else if (!size.Get().Equals(impl->cachedSize))
UpdateScale();
}
}
// Request mesh if its id changes
if (collisionMeshRef.ValueChanged() && isShapeTriMeshOrConvexHull && !meshRequested)
RequestMesh();
// Readd body to the world in case phantom or kinematic classification changed
if (!bodyRead && (phantom.ValueChanged() || kinematic.ValueChanged()))
ReaddBody();
if (drawDebug.ValueChanged())
{
bool enable = drawDebug.Get();
if (impl->body)
{
int collisionFlags = impl->body->getCollisionFlags();
if (enable)
collisionFlags &= ~btCollisionObject::CF_DISABLE_VISUALIZE_OBJECT;
else
collisionFlags |= btCollisionObject::CF_DISABLE_VISUALIZE_OBJECT;
impl->body->setCollisionFlags(collisionFlags);
}
// Refresh PhysicsWorld's knowledge of debug-enabled rigidbodies
if (impl->world)
{
if (enable)
impl->world->debugRigidBodies_.Insert(this);
else
impl->world->debugRigidBodies_.Erase(this);
}
}
if (linearVelocity.ValueChanged() && !impl->disconnected)
{
impl->body->setLinearVelocity(linearVelocity.Get());
impl->body->activate();
}
if (angularVelocity.ValueChanged() && !impl->disconnected)
{
impl->body->setAngularVelocity(DegToRad(angularVelocity.Get()));
impl->body->activate();
}
if (useGravity.ValueChanged())
UpdateGravity();
}
void RigidBody::OnTerrainRegenerated()
{
if (shapeType.Get() == HeightField)
CreateCollisionShape();
}