int Intersect_Light_Tree(RAY *Ray, PROJECT_TREE_NODE *Tree, int x, int y, INTERSECTION *Best_Intersection, OBJECT **Best_Object, LIGHT_SOURCE * /*Light_Source*/)
{
INTERSECTION New_Intersection;
unsigned short i;
int Found;
RAYINFO rayinfo;
DBL key;
BBOX_TREE *BBox_Node;
PROJECT_TREE_NODE *Node;
/* If there's no vista tree then return. */
if (Tree == NULL)
{
return(false);
}
/* Start with an empty priority queue */
New_Intersection.Object = NULL;
VLBuffer_Queue->QSize = 0;
Found = false;
#ifdef BBOX_EXTRA_STATS
Increase_Counter(stats[totalQueueResets]);
#endif
/* Traverse the tree. */
Node_Queue->QSize = 0;
/* Create the direction vectors for this ray */
Create_Rayinfo(Ray, &rayinfo);
/* Fill the priority queue with all possible candidates */
/* Check root */
Increase_Counter(stats[LBuffer_Tests]);
if ((x >= Tree->Project.x1) && (x <= Tree->Project.x2) &&
(y >= Tree->Project.y1) && (y <= Tree->Project.y2))
{
Increase_Counter(stats[LBuffer_Tests_Succeeded]);
Node_Queue->Queue[(Node_Queue->QSize)++] = Tree;
}
/* Loop until queue is empty. */
while (Node_Queue->QSize > 0)
{
Tree = Node_Queue->Queue[--(Node_Queue->QSize)];
if (Tree->is_leaf)
{
/* Leaf --> test object's bounding box in 3d */
Check_And_Enqueue(VLBuffer_Queue,
((PROJECT_TREE_LEAF *)Tree)->Node,
&((PROJECT_TREE_LEAF *)Tree)->Node->BBox, &rayinfo);
}
else
{
/* Check siblings of the node in 2d */
for (i = 0; i < Tree->Entries; i++)
{
Node = Tree->Entry[i];
Increase_Counter(stats[LBuffer_Tests]);
if ((x >= Node->Project.x1) && (x <= Node->Project.x2) &&
(y >= Node->Project.y1) && (y <= Node->Project.y2))
{
Increase_Counter(stats[LBuffer_Tests_Succeeded]);
/* Reallocate queues if they're too small. */
Reinitialize_VLBuffer_Code();
/* Add node to node queue */
Node_Queue->Queue[(Node_Queue->QSize)++] = Node;
}
}
}
}
/* Now test the candidates in the priority queue */
while (VLBuffer_Queue->QSize > 0)
{
Priority_Queue_Delete(VLBuffer_Queue, &key, &BBox_Node);
if (key > Best_Intersection->Depth)
{
break;
}
if (Intersection(&New_Intersection, (OBJECT *)BBox_Node->Node, Ray))
{
if (New_Intersection.Depth < Best_Intersection->Depth &&
/* NK Feb 6, 2000 - bugfix */
New_Intersection.Depth > Small_Tolerance)
{
*Best_Intersection = New_Intersection;
*Best_Object = (OBJECT *)BBox_Node->Node;
Found = true;
}
}
}
return(Found);
}
bool Intersect_BBox_Tree(BBOX_TREE *Root, RAY *Ray, INTERSECTION *Best_Intersection, OBJECT **Best_Object, bool shadow_flag)
{
int i, found;
DBL Depth;
BBOX_TREE *Node;
RAYINFO rayinfo;
INTERSECTION New_Intersection;
/* Create the direction vectors for this ray. */
Create_Rayinfo(Ray, &rayinfo);
/* Start with an empty priority queue. */
New_Intersection.Object = NULL;
found = false;
Frame_Queue->QSize = 0;
#ifdef BBOX_EXTRA_STATS
Increase_Counter(stats[totalQueueResets]);
#endif
/* Check top node. */
Check_And_Enqueue(Frame_Queue, Root, &Root->BBox, &rayinfo);
/* Check elements in the priority queue. */
while (Frame_Queue->QSize)
{
Priority_Queue_Delete(Frame_Queue, &Depth, &Node);
/*
* If current intersection is larger than the best intersection found
* so far our task is finished, because all other bounding boxes in
* the priority queue are further away.
*/
if (Depth > Best_Intersection->Depth)
{
break;
}
/* Check current node. */
if (Node->Entries)
{
/* This is a node containing leaves to be checked. */
for (i = 0; i < Node->Entries; i++)
{
Check_And_Enqueue(Frame_Queue, Node->Node[i], &Node->Node[i]->BBox, &rayinfo);
}
}
else
{
/* This is a leaf so test contained object. */
/* Add Object-Ray options [ENB 9/97] */
if ( TEST_RAY_FLAGS_SHADOW((OBJECT *)Node->Node) )
{
if (Intersection(&New_Intersection, (OBJECT *)Node->Node, Ray))
{
if (New_Intersection.Depth < Best_Intersection->Depth)
{
*Best_Intersection = New_Intersection;
*Best_Object = (OBJECT *)Node->Node;
found = true;
}
}
}
}
}
return (found);
}
