public void EnforceMinimumDepth()
{
if (_nodeDepth < _parentTree.MinimumDepth)
{
if (this.HasChildren)
{
_isActive = false;
_isSplit = true;
ChildTopLeft.EnforceMinimumDepth();
ChildTopRight.EnforceMinimumDepth();
ChildBottomLeft.EnforceMinimumDepth();
ChildBottomRight.EnforceMinimumDepth();
}
else
{
this.Activate();
_isSplit = false;
}
return;
}
if (_nodeDepth == _parentTree.MinimumDepth || (_nodeDepth < _parentTree.MinimumDepth && !this.HasChildren))
{
this.Activate();
_isSplit = false;
}
}
/// <summary>
/// Get a reference to the deepest node that contains a point.
/// </summary>
/// <param name="point">Vector3 representing the target point</param>
/// <returns>Deepest quad node containing target point</returns>
public QuadNode DeepestNodeWithPoint(Vector3 point)
{
//If the point isn't in this node, return null
if (!Contains(point))
{
return(null);
}
if (HasChildren)
{
if (ChildTopLeft.Contains(point))
{
return(ChildTopLeft.DeepestNodeWithPoint(point));
}
if (ChildTopRight.Contains(point))
{
return(ChildTopRight.DeepestNodeWithPoint(point));
}
if (ChildBottomLeft.Contains(point))
{
return(ChildBottomLeft.DeepestNodeWithPoint(point));
}
//It's contained in this node and not in the first 3
//children, so has to be in 4th child. No need to check.
return(ChildBottomRight.DeepestNodeWithPoint(point));
}
//No children, return this QuadNode
return(this);
}
/// <summary>
/// Force the quad tree to split to the minimum depth
/// </summary>
internal void EnforceMinimumDepth()
{
if (_nodeDepth < _parentTree.MinimumDepth)
{
if (HasChildren)
{
_isActive = false;
_isSplit = true;
ChildTopLeft.EnforceMinimumDepth();
ChildTopRight.EnforceMinimumDepth();
ChildBottomLeft.EnforceMinimumDepth();
ChildBottomRight.EnforceMinimumDepth();
}
else
{
Activate();
_isSplit = false;
}
return;
}
if (_nodeDepth == _parentTree.MinimumDepth)
{
Activate();
_isSplit = false;
}
}
/// <summary>
/// Add this node to the terrain's batch.
/// </summary>
/// <param name="fullyContained">Whether this node is known to be fully contained within the clipping frustums, in which case it and its children do not need to check clipping against it.</param>
/// <param name="viewPoint">The position that this node is being viewed from.</param>
/// <param name="distance">Equal to the distance from the <paramref name="viewPoint"/> to the nearest point on this node. This is needed by parent nodes for sorting, so it is calculated there and then passed down.</param>
public void Batch(bool fullyContained, ref Vector3d viewPoint, double distance)
{
if (!CheckClip(ref fullyContained))
{
return;
}
double lodBlend = LodBlend(distance);
if (lodBlend >= 1 && !IsLeaf)
{
TerrainTreeNode a = ChildTopLeft, b = ChildTopRight, c = ChildBottomLeft, d = ChildBottomRight;
double ad = ChildTopLeft.DistanceTo(ref viewPoint);
double bd = ChildTopRight.DistanceTo(ref viewPoint);
double cd = ChildBottomLeft.DistanceTo(ref viewPoint);
double dd = ChildBottomRight.DistanceTo(ref viewPoint);
SortByDepth(ref ad, ref bd, ref cd, ref dd, ref a, ref b, ref c, ref d);
a.Batch(fullyContained, ref viewPoint, ad);
b.Batch(fullyContained, ref viewPoint, bd);
c.Batch(fullyContained, ref viewPoint, cd);
d.Batch(fullyContained, ref viewPoint, dd);
return;
}
Terrain.AddInstanceArray(TexelCorner.X, TexelCorner.Y, Lod + lodBlend, TexelSize);
}
/// <summary>
/// Update the <see cref="Box"/> value on the basis of data read from a shader.
/// </summary>
/// <param name="dirty">The boundaries of the modified area in cells.</param>
/// <param name="smallHeightData"></param>
public void Clean(ref Box2i dirty, float[] smallHeightData)
{
if (dirty.Min.X > pBox.Max.X || dirty.Min.Y > pBox.Max.Z || dirty.Max.X <= pBox.Min.X || dirty.Max.Y <= pBox.Min.Z)
{
return;
}
if (IsLeaf)
{
var offset = (VertexCorner.X + VertexCorner.Y * (Terrain.BlockSize / 16)) * 2;
double min = smallHeightData[offset + 0], max = smallHeightData[offset + 1];
pBox.Min.Y = min;
pBox.Max.Y = max;
}
else
{
ChildTopLeft.Clean(ref dirty, smallHeightData);
ChildTopRight.Clean(ref dirty, smallHeightData);
ChildBottomLeft.Clean(ref dirty, smallHeightData);
ChildBottomRight.Clean(ref dirty, smallHeightData);
pBox.Min.Y = Math.Min(Math.Min(ChildTopLeft.pBox.Min.Y, ChildTopRight.pBox.Min.Y), Math.Min(ChildBottomLeft.pBox.Min.Y, ChildBottomRight.pBox.Min.Y));
pBox.Max.Y = Math.Max(Math.Max(ChildTopLeft.pBox.Max.Y, ChildTopRight.pBox.Max.Y), Math.Max(ChildBottomLeft.pBox.Max.Y, ChildBottomRight.pBox.Max.Y));
}
}
internal void SetActiveVertices()
{
if (_parentTree.Cull && !IsInView)
{
return;
}
if (_isSplit && this.HasChildren)
{
ChildTopLeft.SetActiveVertices();
ChildTopRight.SetActiveVertices();
ChildBottomLeft.SetActiveVertices();
ChildBottomRight.SetActiveVertices();
return;
}
//Top Triangle(s)
_parentTree.UpdateBuffer(VertexCenter.Index);
_parentTree.UpdateBuffer(VertexTopLeft.Index);
if (VertexTop.Activated)
{
_parentTree.UpdateBuffer(VertexTop.Index);
_parentTree.UpdateBuffer(VertexCenter.Index);
_parentTree.UpdateBuffer(VertexTop.Index);
}
_parentTree.UpdateBuffer(VertexTopRight.Index);
//Right Triangle(s)
_parentTree.UpdateBuffer(VertexCenter.Index);
_parentTree.UpdateBuffer(VertexTopRight.Index);
if (VertexRight.Activated)
{
_parentTree.UpdateBuffer(VertexRight.Index);
_parentTree.UpdateBuffer(VertexCenter.Index);
_parentTree.UpdateBuffer(VertexRight.Index);
}
_parentTree.UpdateBuffer(VertexBottomRight.Index);
//Bottom Triangle(s)
_parentTree.UpdateBuffer(VertexCenter.Index);
_parentTree.UpdateBuffer(VertexBottomRight.Index);
if (VertexBottom.Activated)
{
_parentTree.UpdateBuffer(VertexBottom.Index);
_parentTree.UpdateBuffer(VertexCenter.Index);
_parentTree.UpdateBuffer(VertexBottom.Index);
}
_parentTree.UpdateBuffer(VertexBottomLeft.Index);
//Left Triangle(s)
_parentTree.UpdateBuffer(VertexCenter.Index);
_parentTree.UpdateBuffer(VertexBottomLeft.Index);
if (VertexLeft.Activated)
{
_parentTree.UpdateBuffer(VertexLeft.Index);
_parentTree.UpdateBuffer(VertexCenter.Index);
_parentTree.UpdateBuffer(VertexLeft.Index);
}
_parentTree.UpdateBuffer(VertexTopLeft.Index);
}
/// <summary>
/// Update reference to neighboring quads
/// </summary>
private void AddNeighbors()
{
switch (NodeType)
{
case NodeType.TopLeft: //Top Left Corner
//Top neighbor
if (_parent.NeighborTop != null)
{
NeighborTop = _parent.NeighborTop.ChildBottomLeft;
}
//Right neighbor
NeighborRight = _parent.ChildTopRight;
//Bottom neighbor
NeighborBottom = _parent.ChildBottomLeft;
//Left neighbor
if (_parent.NeighborLeft != null)
{
NeighborLeft = _parent.NeighborLeft.ChildTopRight;
}
break;
case NodeType.TopRight: //Top Right Corner
//Top neighbor
if (_parent.NeighborTop != null)
{
NeighborTop = _parent.NeighborTop.ChildBottomRight;
}
//Right neighbor
if (_parent.NeighborRight != null)
{
NeighborRight = _parent.NeighborRight.ChildTopLeft;
}
//Bottom neighbor
NeighborBottom = _parent.ChildBottomRight;
//Left neighbor
NeighborLeft = _parent.ChildTopLeft;
break;
case NodeType.BottomLeft: //Bottom Left Corner
//Top neighbor
NeighborTop = _parent.ChildTopLeft;
//Right neighbor
NeighborRight = _parent.ChildBottomRight;
//Bottom neighbor
if (_parent.NeighborBottom != null)
{
NeighborBottom = _parent.NeighborBottom.ChildTopLeft;
}
//Left neighbor
if (_parent.NeighborLeft != null)
{
NeighborLeft = _parent.NeighborLeft.ChildBottomRight;
}
break;
case NodeType.BottomRight: //Bottom Right Corner
//Top neighbor
NeighborTop = _parent.ChildTopRight;
//Right neighbor
if (_parent.NeighborRight != null)
{
NeighborRight = _parent.NeighborRight.ChildBottomLeft;
}
//Bottom neighbor
if (_parent.NeighborBottom != null)
{
NeighborBottom = _parent.NeighborBottom.ChildTopRight;
}
//Left neighbor
NeighborLeft = _parent.ChildBottomLeft;
break;
}
if (this.HasChildren)
{
ChildTopLeft.AddNeighbors();
ChildTopRight.AddNeighbors();
ChildBottomLeft.AddNeighbors();
ChildBottomRight.AddNeighbors();
}
}
/// <summary>
/// Merge split quad nodes
/// </summary>
public void Merge()
{
//Only perform the merge if there are children
VertexTop.Activated = false;
VertexLeft.Activated = false;
VertexRight.Activated = false;
VertexBottom.Activated = false;
if (NodeType != NodeType.FullNode)
{
VertexTopLeft.Activated = false;
VertexTopRight.Activated = false;
VertexBottomLeft.Activated = false;
VertexBottomRight.Activated = false;
}
_isActive = true;
_isSplit = false;
if (HasChildren)
{
if (ChildTopLeft.IsSplit)
{
ChildTopLeft.Merge();
ChildTopLeft.IsActive = false;
}
else
{
ChildTopLeft.VertexTop.Activated = false;
ChildTopLeft.VertexLeft.Activated = false;
ChildTopLeft.VertexRight.Activated = false;
ChildTopLeft.VertexBottom.Activated = false;
}
if (ChildTopRight.IsSplit)
{
ChildTopRight.Merge();
ChildTopRight.IsActive = false;
}
else
{
ChildTopRight.VertexTop.Activated = false;
ChildTopRight.VertexLeft.Activated = false;
ChildTopRight.VertexRight.Activated = false;
ChildTopRight.VertexBottom.Activated = false;
}
if (ChildBottomLeft.IsSplit)
{
ChildBottomLeft.Merge();
ChildBottomLeft.IsActive = false;
}
else
{
ChildBottomLeft.VertexTop.Activated = false;
ChildBottomLeft.VertexLeft.Activated = false;
ChildBottomLeft.VertexRight.Activated = false;
ChildBottomLeft.VertexBottom.Activated = false;
}
if (ChildBottomRight.IsSplit)
{
ChildBottomRight.Merge();
ChildBottomRight.IsActive = false;
}
else
{
ChildBottomRight.VertexTop.Activated = false;
ChildBottomRight.VertexLeft.Activated = false;
ChildBottomRight.VertexRight.Activated = false;
ChildBottomRight.VertexBottom.Activated = false;
}
}
}
/// <summary>
/// Split the node by activating vertices
/// </summary>
public void Split()
{
if (_parentTree.Cull && !IsInView)
{
return;
}
//Make sure parent node is split
if (_parent != null && !_parent.IsSplit)
{
_parent.Split();
}
if (CanSplit)
{
//Set active nodes
if (HasChildren)
{
ChildTopLeft.Activate();
ChildTopRight.Activate();
ChildBottomLeft.Activate();
ChildBottomRight.Activate();
_isActive = false;
}
else
{
_isActive = true;
}
_isSplit = true;
//Set active vertices
VertexTop.Activated = true;
VertexLeft.Activated = true;
VertexRight.Activated = true;
VertexBottom.Activated = true;
}
//Make sure neighbor parents are split
EnsureNeighborParentSplit(NeighborTop);
EnsureNeighborParentSplit(NeighborRight);
EnsureNeighborParentSplit(NeighborBottom);
EnsureNeighborParentSplit(NeighborLeft);
//Make sure neighbor vertices are active
if (NeighborTop != null)
{
NeighborTop.VertexBottom.Activated = true;
}
if (NeighborRight != null)
{
NeighborRight.VertexLeft.Activated = true;
}
if (NeighborBottom != null)
{
NeighborBottom.VertexTop.Activated = true;
}
if (NeighborLeft != null)
{
NeighborLeft.VertexRight.Activated = true;
}
}
