C++ GetWorldBoundingBox函数代码示例

void BillboardSet::UpdateBatches(const FrameInfo& frame)
{
    // If beginning a new frame, assume no sorting first
    if (frame.frameNumber_ != sortFrameNumber_)
    {
        sortThisFrame_ = false;
        sortFrameNumber_ = frame.frameNumber_;
    }
    
    Vector3 worldPos = node_->GetWorldPosition();
    Vector3 offset = (worldPos - frame.camera_->GetNode()->GetWorldPosition());
    // Sort if position relative to camera has changed
    if (offset != previousOffset_ & sorted_)
        sortThisFrame_ = true;
    
    distance_ = frame.camera_->GetDistance(GetWorldBoundingBox().Center());

    // Calculate scaled distance for animation LOD
    float scale = GetWorldBoundingBox().Size().DotProduct(DOT_SCALE);
    // If there are no billboards, the size becomes zero, and LOD'ed updates no longer happen. Disable LOD in that case
    if (scale > M_EPSILON)
        lodDistance_ = frame.camera_->GetLodDistance(distance_, scale, lodBias_);
    else
        lodDistance_ = 0.0f;

    batches_[0].distance_ = distance_;
    batches_[0].numWorldTransforms_ = 2;
    // Billboard positioning
    transforms_[0] = relative_ ? node_->GetWorldTransform() : Matrix3x4::IDENTITY;
    // Billboard rotation
    transforms_[1] = Matrix3x4(Vector3::ZERO, faceCameraMode_ != FC_NONE ? frame.camera_->GetFaceCameraRotation(
        node_->GetWorldPosition(), node_->GetWorldRotation(), faceCameraMode_) : node_->GetWorldRotation(), Vector3::ONE);
}

void BillboardSet::UpdateBatches(const FrameInfo& frame)
{
    // Check if position relative to camera has changed, and re-sort in that case
    const Matrix3x4& worldTransform = node_->GetWorldTransform();
    Vector3 worldPos = worldTransform.Translation();
    Vector3 offset = (worldPos - frame.camera_->GetNode()->GetWorldPosition());
    if (offset != previousOffset_)
    {
        previousOffset_ = offset;
        if (sorted_)
        {
            // Sort billboards only once per frame. This means that secondary views will get
            // the same sorting as the main view
            if (frame.frameNumber_ != sortFrameNumber_)
            {
                sortFrameNumber_ = frame.frameNumber_;
                bufferDirty_ = true;
            }
        }
    }
    
    distance_ = frame.camera_->GetDistance(GetWorldBoundingBox().Center());
    
    // Calculate scaled distance for animation LOD
    float scale = GetWorldBoundingBox().Size().DotProduct(DOT_SCALE);
    // If there are no billboards, the size becomes zero, and LOD'ed updates no longer happen. Disable LOD in that case
    if (scale > M_EPSILON)
        lodDistance_ = frame.camera_->GetLodDistance(distance_, scale, lodBias_);
    else
        lodDistance_ = 0.0f;
    
    batches_[0].distance_ = distance_;
    batches_[0].worldTransform_ = relative_ ? &node_->GetWorldTransform() : &Matrix3x4::IDENTITY;
}

csScreenBoxResult csMeshWrapper::GetScreenBoundingBox (iCamera *camera)
{
  csScreenBoxResult rc;

  // Calculate camera space bbox.
  csReversibleTransform tr_o2c = camera->GetTransform ();
  if (!movable.IsFullTransformIdentity ())
    tr_o2c /= movable.GetFullTransform ();
  
  rc.cbox = GetTransformedBoundingBox (tr_o2c);

  // Calculate screen space bbox.
  float minz, maxz;
  const csBox3& wbox = GetWorldBoundingBox();
  if(!wbox.ProjectBox(camera->GetTransform(), camera->GetProjectionMatrix(),
      rc.sbox, minz, maxz, engine->G3D->GetWidth(),
      engine->G3D->GetHeight()))
  {
      rc.distance = -1;
  }
  else
  {
      rc.distance = rc.cbox.MaxZ ();
  }

  return rc;
}

		Air::U1 MeshEntity::RayCast( const Ray& ray ,float*	pOutDistance)
		{
#if 1
			if(!GetWorldBoundingBox().RayCast(ray.GetOrigin(),ray.GetDirection())){//.Intersect(GetWorldBoundingBox())){
				return	false;
			}
#endif

			Matrix	matWorld	=	*GetWorldMatrix();
			Matrix	matWorldInv	=	matWorld;
			matWorldInv.Inverse();
			Float3	vStart	=	ray.m_vStart;
			Float3	vLookAt	=	vStart	+	ray.m_vDirection;
			vStart			=	matWorldInv*vStart;
			vLookAt			=	matWorldInv*vLookAt;
			Float3	vDir	=	(vLookAt	-	vStart);
			vDir.Normalize();

			Ray	objSpaceRay(vStart,vDir);

			float	fDistance	=	999999.0f;

			U1	bHit	=	m_pMesh->RayCast(objSpaceRay,&fDistance);
			if(bHit	&&	pOutDistance!=NULL){
				Float3	vObjSpaceHitPostion		=	vStart	+	vDir*fDistance;
				Float3	vWorldSpaceHiPosition	=	matWorld*vObjSpaceHitPostion;
				*pOutDistance	=	(vWorldSpaceHiPosition	-	ray.m_vStart).Length();
			}
			return	bHit;
		}

void Text3D::UpdateBatches(const FrameInfo& frame)
{
    distance_ = frame.camera_->GetDistance(GetWorldBoundingBox().Center());

    if (faceCameraMode_ != FC_NONE)
    {
        Vector3 worldPosition = node_->GetWorldPosition();
        customWorldTransform_ = Matrix3x4(worldPosition, frame.camera_->GetFaceCameraRotation(
            worldPosition, node_->GetWorldRotation(), faceCameraMode_), node_->GetWorldScale());
        worldBoundingBoxDirty_ = true;
    }

    for (unsigned i = 0; i < batches_.Size(); ++i)
    {
        batches_[i].distance_ = distance_;
        batches_[i].worldTransform_ = faceCameraMode_ != FC_NONE ? &customWorldTransform_ : &node_->GetWorldTransform();
    }

    for (unsigned i = 0; i < uiBatches_.Size(); ++i)
    {
        if (uiBatches_[i].texture_ && uiBatches_[i].texture_->IsDataLost())
        {
            fontDataLost_ = true;
            break;
        }
    }
}

void StaticModelGroup::UpdateBatches(const FrameInfo& frame)
{
    // Getting the world bounding box ensures the transforms are updated
    const BoundingBox& worldBoundingBox = GetWorldBoundingBox();
    const Matrix3x4& worldTransform = node_->GetWorldTransform();
    distance_ = frame.camera_->GetDistance(worldBoundingBox.Center());
    
    if (batches_.Size() > 1)
    {
        for (unsigned i = 0; i < batches_.Size(); ++i)
        {
            batches_[i].distance_ = frame.camera_->GetDistance(worldTransform * geometryData_[i].center_);
            batches_[i].worldTransform_ = numWorldTransforms_ ? &worldTransforms_[0] : &Matrix3x4::IDENTITY;
            batches_[i].numWorldTransforms_ = numWorldTransforms_;
        }
    }
    else if (batches_.Size() == 1)
    {
        batches_[0].distance_ = distance_;
        batches_[0].worldTransform_ = numWorldTransforms_ ? &worldTransforms_[0] : &Matrix3x4::IDENTITY;
        batches_[0].numWorldTransforms_ = numWorldTransforms_;
    }
    
    float scale = worldBoundingBox.Size().DotProduct(DOT_SCALE);
    float newLodDistance = frame.camera_->GetLodDistance(distance_, scale, lodBias_);
    
    if (newLodDistance != lodDistance_)
    {
        lodDistance_ = newLodDistance;
        CalculateLodLevels();
    }
}

void Zone::ClearDrawablesZone()
{
    if (octant_ && lastWorldBoundingBox_.defined_)
    {
        PODVector<Drawable*> result;
        BoxOctreeQuery query(result, lastWorldBoundingBox_, DRAWABLE_GEOMETRY | DRAWABLE_ZONE);
        octant_->GetRoot()->GetDrawables(query);

        for (PODVector<Drawable*>::Iterator i = result.Begin(); i != result.End(); ++i)
        {
            Drawable* drawable = *i;
            unsigned drawableFlags = drawable->GetDrawableFlags();
            if (drawableFlags & DRAWABLE_GEOMETRY)
                drawable->SetZone(0);
            else if (drawableFlags & DRAWABLE_ZONE)
            {
                Zone* zone = static_cast<Zone*>(drawable);
                zone->lastAmbientStartZone_.Reset();
                zone->lastAmbientEndZone_.Reset();
            }
        }
    }

    lastWorldBoundingBox_ = GetWorldBoundingBox();
    lastAmbientStartZone_.Reset();
    lastAmbientEndZone_.Reset();
}

void StaticModel::UpdateBatches(const FrameInfo& frame)
{
    const BoundingBox& worldBoundingBox = GetWorldBoundingBox();
    distance_ = frame.camera_->GetDistance(worldBoundingBox.Center());

    if (batches_.Size() == 1)
        batches_[0].distance_ = distance_;
    else
    {
        const Matrix3x4& worldTransform = node_->GetWorldTransform();
        for (unsigned i = 0; i < batches_.Size(); ++i)
            batches_[i].distance_ = frame.camera_->GetDistance(worldTransform * geometryData_[i].center_);
    }

    float scale = worldBoundingBox.Size().DotProduct(DOT_SCALE);
    float newLodDistance = frame.camera_->GetLodDistance(distance_, scale, lodBias_);

    if (newLodDistance != lodDistance_)
    {
        lodDistance_ = newLodDistance;
        CalculateLodLevels();
    }

    // ATOMIC BEGIN
    if (geometryDisabled_)
        UpdateBatchesHideGeometry();
    // ATOMIC END

}

void Drawable2D::UpdateBatches(const FrameInfo& frame)
{
    const Matrix3x4& worldTransform = node_->GetWorldTransform();
    distance_ = frame.camera_->GetDistance(GetWorldBoundingBox().Center());

    batches_[0].distance_ = distance_;
    batches_[0].worldTransform_ = &worldTransform;
}

void StaticModelGroup::ProcessRayQuery(const RayOctreeQuery& query, PODVector<RayQueryResult>& results)
{
    // If no bones or no bone-level testing, use the Drawable test
    RayQueryLevel level = query.level_;
    if (level < RAY_AABB)
    {
        Drawable::ProcessRayQuery(query, results);
        return;
    }

    // Check ray hit distance to AABB before proceeding with more accurate tests
    // GetWorldBoundingBox() updates the world transforms
    if (query.ray_.HitDistance(GetWorldBoundingBox()) >= query.maxDistance_)
        return;
    
    for (unsigned i = 0; i < numWorldTransforms_; ++i)
    {
        // Initial test using AABB
        float distance = query.ray_.HitDistance(boundingBox_.Transformed(worldTransforms_[i]));
        
        // Then proceed to OBB and triangle-level tests if necessary
        if (level >= RAY_OBB && distance < query.maxDistance_)
        {
            Matrix3x4 inverse = worldTransforms_[i].Inverse();
            Ray localRay = query.ray_.Transformed(inverse);
            distance = localRay.HitDistance(boundingBox_);
            
            if (level == RAY_TRIANGLE && distance < query.maxDistance_)
            {
                distance = M_INFINITY;
                
                for (unsigned j = 0; j < batches_.Size(); ++j)
                {
                    Geometry* geometry = batches_[j].geometry_;
                    if (geometry)
                    {
                        float geometryDistance = geometry->GetHitDistance(localRay);
                        if (geometryDistance < query.maxDistance_ && geometryDistance < distance)
                            distance = geometryDistance;
                    }
                }
            }
        }
        
        if (distance < query.maxDistance_)
        {
            RayQueryResult result;
            result.drawable_ = this;
            result.node_ = node_;
            result.distance_ = distance;
            result.subObject_ = i;
            results.Push(result);
        }
    }
}

void SceneNode::OnUpdateRenderQueues( const Camera& camera, RenderOrder order, uint32_t buckterFilter, uint32_t filterIgnore )
{
	const BoundingBoxf& worldBound = GetWorldBoundingBox();

	if (!camera.Visible(GetWorldBoundingBox()))
		return;

	RenderQueue& renderQueue = mScene->GetRenderQueue();
	for (SceneObject* pSceneObject : mAttachedObjects)
	{
		if (pSceneObject->IsActive() && pSceneObject->Renderable())
			pSceneObject->OnUpdateRenderQueue(&renderQueue, camera, order, buckterFilter, filterIgnore);
	}

	// recursively call children
	for (Node* node : mChildren)
	{
		SceneNode* child = static_cast<SceneNode*>(node);
		child->OnUpdateRenderQueues(camera, order, buckterFilter, filterIgnore);
	}
}

void Light::ProcessRayQuery(const RayOctreeQuery& query, PODVector<RayQueryResult>& results)
{
    // Do not record a raycast result for a directional light, as it would block all other results
    if (lightType_ == LIGHT_DIRECTIONAL)
        return;

    float distance = query.maxDistance_;
    switch (query.level_)
    {
    case RAY_AABB:
        Drawable::ProcessRayQuery(query, results);
        return;

    case RAY_OBB:
        {
            Matrix3x4 inverse(node_->GetWorldTransform().Inverse());
            Ray localRay = query.ray_.Transformed(inverse);
            distance = localRay.HitDistance(GetWorldBoundingBox().Transformed(inverse));
            if (distance >= query.maxDistance_)
                return;
        }
        break;

    case RAY_TRIANGLE:
        if (lightType_ == LIGHT_SPOT)
        {
            distance = query.ray_.HitDistance(GetFrustum());
            if (distance >= query.maxDistance_)
                return;
        }
        else
        {
            distance = query.ray_.HitDistance(Sphere(node_->GetWorldPosition(), range_));
            if (distance >= query.maxDistance_)
                return;
        }
        break;

    case RAY_TRIANGLE_UV:
        LOGWARNING("RAY_TRIANGLE_UV query level is not supported for Light component");
        return;
    }

    // If the code reaches here then we have a hit
    RayQueryResult result;
    result.position_ = query.ray_.origin_ + distance * query.ray_.direction_;
    result.normal_ = -query.ray_.direction_;
    result.distance_ = distance;
    result.drawable_ = this;
    result.node_ = node_;
    result.subObject_ = M_MAX_UNSIGNED;
    results.Push(result);
}

void Drawable::LimitLights()
{
    // Maximum lights value 0 means unlimited
    if (!maxLights_ || lights_.Size() <= maxLights_)
        return;

    // If more lights than allowed, move to vertex lights and cut the list
    const BoundingBox& box = GetWorldBoundingBox();
    for (unsigned i = 0; i < lights_.Size(); ++i)
        lights_[i]->SetIntensitySortValue(box);

    Sort(lights_.Begin(), lights_.End(), CompareDrawables);
    vertexLights_.Insert(vertexLights_.End(), lights_.Begin() + maxLights_, lights_.End());
    lights_.Resize(maxLights_);
}

void Drawable::ProcessRayQuery(const RayOctreeQuery& query, PODVector<RayQueryResult>& results)
{
    float distance = query.ray_.HitDistance(GetWorldBoundingBox());
    if (distance < query.maxDistance_)
    {
        RayQueryResult result;
        result.position_ = query.ray_.origin_ + distance * query.ray_.direction_;
        result.normal_ = -query.ray_.direction_;
        result.distance_ = distance;
        result.drawable_ = this;
        result.node_ = GetNode();
        result.subObject_ = M_MAX_UNSIGNED;
        results.Push(result);
    }
}

void BillboardSet::ProcessRayQuery(const RayOctreeQuery& query, PODVector<RayQueryResult>& results)
{
    // If no billboard-level testing, use the Drawable test
    if (query.level_ < RAY_TRIANGLE)
    {
        Drawable::ProcessRayQuery(query, results);
        return;
    }

    // Check ray hit distance to AABB before proceeding with billboard-level tests
    if (query.ray_.HitDistance(GetWorldBoundingBox()) >= query.maxDistance_)
        return;

    const Matrix3x4& worldTransform = node_->GetWorldTransform();
    Matrix3x4 billboardTransform = relative_ ? worldTransform : Matrix3x4::IDENTITY;
    Vector3 billboardScale = scaled_ ? worldTransform.Scale() : Vector3::ONE;

    for (unsigned i = 0; i < billboards_.Size(); ++i)
    {
        if (!billboards_[i].enabled_)
            continue;

        // Approximate the billboards as spheres for raycasting
        float size = INV_SQRT_TWO * (billboards_[i].size_.x_ * billboardScale.x_ + billboards_[i].size_.y_ * billboardScale.y_);
        if (fixedScreenSize_)
            size *= billboards_[i].screenScaleFactor_;
        Vector3 center = billboardTransform * billboards_[i].position_;
        Sphere billboardSphere(center, size);

        float distance = query.ray_.HitDistance(billboardSphere);
        if (distance < query.maxDistance_)
        {
            // If the code reaches here then we have a hit
            RayQueryResult result;
            result.position_ = query.ray_.origin_ + distance * query.ray_.direction_;
            result.normal_ = -query.ray_.direction_;
            result.distance_ = distance;
            result.drawable_ = this;
            result.node_ = node_;
            result.subObject_ = i;
            results.Push(result);
        }
    }
}