/// <summary>
/// Split the node by activating vertices
/// </summary>
public void Split()
{
//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;
}
}
public void Update(GameTime gameTime)
{
View = camera.World;
Projection = camera.Projection;
CameraPosition = camera.Position;
//Only update if the camera position has changed
if (_cameraPosition == _lastCameraPosition)
{
return;
}
//Effect.View = View;
//Effect.Projection = Projection;
_lastCameraPosition = _cameraPosition;
IndexCount = 0;
_rootNode.EnforceMinimumDepth();
_activeNode = _rootNode.DeepestNodeWithPoint(CameraPosition);
if (_activeNode != null)
{
_activeNode.Split();
}
_rootNode.SetActiveVertices();
_buffers.UpdateIndexBuffer(Indices, IndexCount);
_buffers.SwapBuffer();
}