/// <summary>
/// 截头体剔除算法入口
/// </summary>
private void FrustumCull()
{
mMinQueue.Clear();
PushBox(Tree.Root, ref Tree.Root.Box);
while (mMinQueue.Size > 0)
{
OONode nd = (OONode)mMinQueue.Dequeue();
if (mFrustum.Test(ref nd.Box) > 0)
{
nd.Distribute(mMaxLevel, mMaxItems);
OOItem itm = nd.Head.Next;
while (itm != nd.Tail)
{
OOModel obj = itm.Obj;
if (obj.TouchId != Tree.TouchCounter)
{
obj.TouchId = Tree.TouchCounter;
if (mFrustum.Test(ref obj.Box) > 0)
{
obj.Next = null;
if (mVisible == null)
{
mVisible = mTail = obj;
}
else
{
mTail.Next = obj;
mTail = obj;
}
}
}
itm = itm.Next;
}
if (nd.SplitAxis != OONode.LEAF)
{
PushBox(nd.Left, ref nd.Left.Box);
PushBox(nd.Right, ref nd.Right.Box);
}
}
}
}
/// <summary>
/// 老旧的遮挡剔除算法入口
/// </summary>
private void OcclusionCullOld()
{
Stat[0] = Stat[1] = 0;
Map.Clear();
mMinQueue.Clear();
mMaxQueue.Clear();
PushBox(Tree.Root, ref Tree.Root.Box);
while (mMinQueue.Size > 0)
{
OONode nd = (OONode)mMinQueue.Dequeue();
nd.Distribute(mMaxLevel, mMaxItems);
MinMax(ref nd.Box, ref nd.Box.Zmin, ref nd.Box.Zmax);
if (nd.SplitAxis != OONode.LEAF)
{
if (nd.Visible != 0 || IsVisible(1, ref nd.Box, nd.Box.Zmin) != 0)
{
nd.Visible = 1;
PushBox(nd.Left, ref nd.Left.Box);
PushBox(nd.Right, ref nd.Right.Box);
}
else
{
nd.Visible = 0;
if (nd.Parent != null)
{
nd.Parent.Visible = 0;
}
}
}
else
{
if (IsVisible(1, ref nd.Box, nd.Box.Zmin) != 0)
{
OOItem itm = nd.Head.Next;
while (itm != nd.Tail)
{
if (itm.Obj.TouchId != Tree.TouchCounter)
{
itm.Obj.TouchId = Tree.TouchCounter;
OOModel obj = itm.Obj;
float dis = -Vector3.Dot(obj.Box.Mid, mLook);
float d = Vector3.Dot(mAbsLook, obj.Box.Size);
obj.Box.Zmin = dis - d;
obj.Box.Zmax = dis + d;
if (IsVisible(0, ref obj.Box, 0) != 0)
{
mMaxQueue.Enqueue(obj.Box.Zmax, obj, obj.Box.Zmax);
obj.Next = null;
if (mVisible == null)
{
mVisible = mTail = obj;
}
else
{
mTail.Next = obj;
mTail = obj;
}
}
}
itm = itm.Next;
}
}
if (nd.Parent != null)
{
nd.Parent.Visible = 0;
}
}
}
}
/// <summary>
/// 遮挡剔除 算法入口
/// </summary>
private void OcclusionCull()
{
Stat[0] = Stat[1] = 0;
Map.Clear();
mMinQueue.Clear();
mMaxQueue.Clear();
PushBox2(Tree.Root, ref Tree.Root.Box);
// 按 负无穷范数(最小值) 作为优先权中 遍历
while (mMinQueue.Size > 0)
{
OONode nd = (OONode)mMinQueue.Dequeue();
nd.Distribute(mMaxLevel, mMaxItems);
MinMax(ref nd.Box, ref nd.Box.Zmin, ref nd.Box.Zmax);
if (nd.SplitAxis != OONode.LEAF) // 非叶节点
{
// 该节点存在两个子节点
// 如果 该节点 Visible 为可见 ,则不需要进一步计算
// 如果 该结点 Visible 为不可见,则进一步计算判断可见性
// KDTree的Node不是每次重新分配，带有一定的缓存功能。所以， Visible 可以加速计算
// 存在一个问题：如果所有的物体都分到了一个Node中，可能会不停的划分到最大深度。后期需要优化
if ((nd.Visible != 0) || IsVisible(1, ref nd.Box, nd.Box.Zmin) != 0)
{
// 标记为可见
nd.Visible = 1;
// 父节点可见,接下来判断左右孩子结点的可见性
PushBox2(nd.Left, ref nd.Left.Box);
PushBox2(nd.Right, ref nd.Right.Box);
}
else
{
// 标记为不可见
nd.Visible = 0;
if (nd.Parent != null)
{
nd.Parent.Visible = 0;
}
}
}
else // 叶节点
{
// 叶节点的Box测试
if (IsVisible(1, ref nd.Box, nd.Box.Zmin) != 0)
{
OOItem itm = nd.Head.Next;
// 保存需要绘制的物体，以 Zmax 为优先级排序
while (itm != nd.Tail)
{
if (itm.Obj.TouchId != Tree.TouchCounter)
{
itm.Obj.TouchId = Tree.TouchCounter;
OOModel obj = itm.Obj;
MinMax(ref obj.Box, ref obj.Box.Zmin, ref obj.Box.Zmax);
// 查询物体的Box是否可见
if (IsVisible(0, ref obj.Box, 0) != 0)
{
// 如果一个物体的Box可见，则为待绘制的物体
mMaxQueue.Enqueue(obj.Box.Zmax, obj, obj.Box.Zmax);
obj.Next = null;
if (mVisible == null)
{
mVisible = mTail = obj;
}
else
{
mTail.Next = obj;
mTail = obj;
}
}
}
itm = itm.Next;
}
}
if (nd.Parent != null)
{
nd.Parent.Visible = 0;
}
}
}
#if TEST_DRAW
VisualKDTree(Tree.Root);
if (mMaxQueue.Size > 0)
{
DebugUtils.Info("OcclusionCull", "Before Max Left: ", mMaxQueue.Size);
FlushOccluders(float.MaxValue);
DebugUtils.Info("OcclusionCull", "After Max Left: ", mMaxQueue.Size);
}
Map.DrawScreenShot();
#endif
}