private static void ReadBSPTree(BinaryReader br, ExtractedWMOGroup group)
{
var rootId = br.ReadInt16();
var nodeCount = br.ReadInt32();
var nodeList = new List<BSPNode>(nodeCount);
for (var i = 0; i < nodeCount; i++)
{
var node = new BSPNode {
flags = (BSPNodeFlags) br.ReadByte(),
negChild = br.ReadInt16(),
posChild = br.ReadInt16(),
planeDist = br.ReadSingle(),
TriIndices = br.ReadIndex3List()
};
nodeList.Add(node);
}
group.Tree = new BSPTree(nodeList, rootId);
}
private static void WriteBSPNode(BinaryWriter writer, BSPNode node)
{
writer.Write((byte)node.flags);
writer.Write(node.negChild);
writer.Write(node.posChild);
writer.Write(node.planeDist);
if (node.TriIndices != null)
{
writer.Write(node.TriIndices);
}
else
{
writer.Write(0);
}
}
private static void VisitNodes(BSPNode node, Ray ray, float tMax, Action<BSPNode> callback)
{
if (node == null) return;
if ((node.flags & BSPNodeFlags.Flag_Leaf) != 0)
{
// Do stuff here
callback(node);
}
//Figure out which child to recurse into first
float startVal;
float dirVal;
if ((node.flags & BSPNodeFlags.Flag_XAxis) != 0)
{
startVal = ray.Position.X;
dirVal = ray.Direction.X;
}
else if((node.flags & BSPNodeFlags.Flag_YAxis) != 0)
{
startVal = ray.Position.Y;
dirVal = ray.Direction.Y;
}
else
{
startVal = ray.Position.Z;
dirVal = ray.Direction.Z;
}
BSPNode first;
BSPNode last;
if (startVal > node.planeDist)
{
first = node.Positive;
last = node.Negative;
}
else
{
first = node.Negative;
last = node.Positive;
}
if (dirVal == 0.0)
{
// Segment is parallel to the splitting plane, visit the near side only.
VisitNodes(first, ray, tMax, callback);
return;
}
// The t-value for the intersection with the boundary plane
var tIntersection = (node.planeDist - startVal) / dirVal;
VisitNodes(first, ray, tMax, callback);
// Test if line segment straddles the boundary plane
if (0.0f > tIntersection || tIntersection > tMax) return;
// It does, visit the far side
VisitNodes(last, ray, tMax, callback);
}
static void ReadMOBN(BinaryReader file, WMOGroup group, uint size)
{
var count = size/0x10;
group.BSPNodes = new List<BSPNode>((int)count);
for (var i=0;i<count;i++)
{
var node = new BSPNode
{
flags = (BSPNodeFlags) file.ReadUInt16(),
negChild = file.ReadInt16(),
posChild = file.ReadInt16(),
nFaces = file.ReadUInt16(),
faceStart = file.ReadUInt32(),
planeDist = file.ReadSingle()
};
group.BSPNodes.Add(node);
}
}
private static void VisitNodes(BSPNode node, Ray ray, float tMax, Action <BSPNode> callback)
{
if (node == null)
{
return;
}
if ((node.flags & BSPNodeFlags.Flag_Leaf) != 0)
{
// Do stuff here
callback(node);
}
//Figure out which child to recurse into first
float startVal;
float dirVal;
if ((node.flags & BSPNodeFlags.Flag_XAxis) != 0)
{
startVal = ray.Position.X;
dirVal = ray.Direction.X;
}
else if ((node.flags & BSPNodeFlags.Flag_YAxis) != 0)
{
startVal = ray.Position.Y;
dirVal = ray.Direction.Y;
}
else
{
startVal = ray.Position.Z;
dirVal = ray.Direction.Z;
}
BSPNode first;
BSPNode last;
if (startVal > node.planeDist)
{
first = node.Positive;
last = node.Negative;
}
else
{
first = node.Negative;
last = node.Positive;
}
if (dirVal == 0.0)
{
// Segment is parallel to the splitting plane, visit the near side only.
VisitNodes(first, ray, tMax, callback);
return;
}
// The t-value for the intersection with the boundary plane
var tIntersection = (node.planeDist - startVal) / dirVal;
VisitNodes(first, ray, tMax, callback);
// Test if line segment straddles the boundary plane
if (0.0f > tIntersection || tIntersection > tMax)
{
return;
}
// It does, visit the far side
VisitNodes(last, ray, tMax, callback);
}
