public QuadPatch( Terrain terrain, QuadPatchVertices vertices, Color patchColour, float x, float z, float w, float d )
{
m_Rs.FaceRenderMode = PolygonRenderMode.Lines;
m_Rs.Colour = patchColour;
m_Terrain = terrain;
m_Vertices = vertices;
m_X = x;
m_Z = z;
m_Width = w;
m_Depth = d;
m_IncreaseDetailDistance = float.MaxValue;
m_VbIndex = vertices.Allocate( );
m_BuildVertices = true;
m_BuildIndices = true;
}