public void Link( QuadPatch left, QuadPatch right, QuadPatch up, QuadPatch down )
{
m_Left = left;
m_Right = right;
m_Up = up;
m_Down = down;
}
public QuadPatchTree( Terrain terrain )
{
terrain.SetTerrainArea( Width, Height );
m_Vertices = new QuadPatchVertices( );
m_Root = new QuadPatch( terrain, m_Vertices, Color.Black, -Width / 2, -Height / 2, Width, Height );
}
private void IncreaseDetail( )
{
m_Vertices.Deallocate( m_VbIndex );
float hW = m_Width / 2;
float hD = m_Depth / 2;
try
{
QuadPatch tl = new QuadPatch( m_Terrain, m_Vertices, Color.Red, m_X, m_Z, hW, hD );
QuadPatch tr = new QuadPatch( m_Terrain, m_Vertices, Color.Black, m_X + hW, m_Z, hW, hD );
QuadPatch bl = new QuadPatch( m_Terrain, m_Vertices, Color.Black, m_X, m_Z + hD, hW, hD );
QuadPatch br = new QuadPatch( m_Terrain, m_Vertices, Color.Red, m_X + hW, m_Z + hD, hW, hD );
tl.Link( m_Left, tr, m_Up, bl );
tr.Link( tl, m_Right, m_Up, br );
bl.Link( m_Left, br, tl, m_Down );
br.Link( bl, m_Right, tr, m_Down );
m_Children = new QuadPatch[ 4 ];
m_Children[ TopLeftChild ] = tl;
m_Children[ TopRightChild ] = tr;
m_Children[ BottomLeftChild ] = bl;
m_Children[ BottomRightChild ] = br;
}
catch ( OutOfMemoryException )
{
m_Children = null;
}
}