C++ AutoAlloc::GetValue方法代码示例

BaseObject* VoxelGenerator::GetVirtualObjects(BaseObject* op, HierarchyHelp* hh)
{	
	BaseContainer* data = op->GetDataInstance();
	BaseDocument* doc = op->GetDocument();

	/************************************************************************/
	Bool dirty = op->CheckCache(hh) || op->IsDirty(DIRTYFLAGS_DATA);
	if (!dirty)
		return op->GetCache(hh);
	
	/************************************************************************/
	Float t_scale		= data->GetFloat(VGEN_SCALE); if(t_scale == 0.0) return nullptr;
	Float t_threshold	= data->GetFloat(VGEN_THRESHOLD);

	Vector scale(t_scale); //Just the vector version of the uniform scale
		
	/************************************************************************/
	//Get the Effex Server (which contains all effex scenes)
	FXAPI::FXServer *server		= FXAPI::FXServer::Get(doc); if(!server) return nullptr;

	//Get the scalar channel's BaseObject interface from the link field
	BaseObject* channel_object	= op->GetDataInstance()->GetObjectLink(VGEN_CHANNEL, doc); if(!channel_object) return nullptr;
	
	//Find the Effex scene the scalar channel belongs to
	FXAPI::FXScene* effex_scene = server->GetEffexScene(channel_object); if(!effex_scene) return nullptr;	
	
	//Finally retrieve the scalar channel node from the effex scene */
	FXAPI::FXScalarChannel* ptr_channel = static_cast<FXAPI::FXScalarChannel*>(FXAPI::GetNode(effex_scene,channel_object,FXAPI::NodeRetrieveType_ScalarChannel));
	if(!ptr_channel) return nullptr;

	/************************************************************************/
	//We wanna place all voxel cubes under this null object
	BaseObject* ret = BaseObject::Alloc(Onull); if(!ret) { return nullptr; }
	//Create a reference cube
	BaseObject* voxel_cube = BaseObject::Alloc(Ocube); if(!voxel_cube) return ret;
	//Set Normal scale
	voxel_cube->GetDataInstance()->SetVector(PRIM_CUBE_LEN, Vector(1.0));
	//Renaming the cube
	voxel_cube->SetName("Voxel Reference");
	//Tell the cube to update bounding box etc.
	voxel_cube->Message(MSG_UPDATE);
	//Finally place the cube under our null object
	voxel_cube->InsertUnder(ret);
	
	/************************************************************************/
	//Now we create a scalar cell iterator which lets us browse all cells of a scalar channel
	//You can use C4D's AutoAlloc class for scope based construction/destruction
	//Otherwise just use FXAPI::FXScalarCellIterator::Alloc/Free
	AutoAlloc<FXAPI::FXScalarCellIterator> iterator;

	//Initialise it with our scalar channel, the cpu threads count we use and if grid border cells should be browsed as well
	if(iterator->Init(ptr_channel, 1, true)) 
	{
		/************************************************************************/
		/* The following part could be called from multiple cpu threads			*/
		/* but here we stay single-threaded										*/
		/************************************************************************/
		Int32 cpu_index = 0; //First cpu = 0

		//Call once per thread
		iterator->Start(cpu_index,false); //passing true would give a reverse iterator

		do //Now we browse with a do...while loop all cells of this cpu
		{
			//The iterator gives us the current cell value 
			double cell_scalar_value = iterator->GetValue(cpu_index);

			//Example: check for value threshold to only create instances in cells containing a value (e.g. smoke density)
			if(cell_scalar_value <= t_threshold)
				continue; //don't process this cell

			//Get the current cell's coordinate (in grid cell space)
			NAVIE_GLOBAL::VecInt3D xyz_cell = iterator->GetCoordinate(cpu_index);

			//Now convert coordinates from grid cell space to world space coordinates
			//which we will use to set the cube instances's position
			NAVIE_GLOBAL::vector3d xyz_global;
			if(FXAPI::GridToWorld(ptr_channel, xyz_cell, xyz_global, false)) 
			{
				//Conversion was fine. Now we create an instance object for this cell				
				BaseObject* voxel_instance = BaseObject::Alloc(Oinstance); if(!voxel_instance) continue;	
				//Set the reference voxel cube as source
				voxel_instance->GetDataInstance()->SetLink(INSTANCEOBJECT_LINK, voxel_cube);
				//Make it a render instance
				voxel_instance->GetDataInstance()->SetBool(INSTANCEOBJECT_RENDERINSTANCE, true); 
				//Renaming the instance to Voxel + its linear coordinate index
				voxel_instance->SetName("Voxel Reference" + String::IntToString(iterator->GetLinearCoordinate(cpu_index)));	

				//Set position (converting from an Effex vector3d to a c4d Vector on the fly)
				voxel_instance->SetAbsPos(FXAPI::Vec3DToVector(xyz_global));			
				//We also control the scale by the scalar cell value
				voxel_instance->SetAbsScale(scale * cell_scalar_value);
				
				//Tell the instance to update all its data
				voxel_instance->Message(MSG_UPDATE);
				//Finally place the instance under our null object
				voxel_instance->InsertUnderLast(ret);				
			}

		} while(iterator->SetNext(cpu_index)); //Go to next cell..
//.........这里部分代码省略.........