Axiom.Components.Terrain.TerrainMaterialGenerator.Profile.UpdateCompositeMap C# (CSharp) Method

            public virtual void UpdateCompositeMap(Terrain terrain, Rectangle rect)
            {
                // convert point-space rect into image space
                int compSize = terrain.CompositeMap.Width;
                Rectangle imgRect = new Rectangle();
                Vector3 inVec = Vector3.Zero, outVec = Vector3.Zero;
                inVec.x = rect.Left;
                inVec.y = rect.Bottom - 1; // this is 'top' in image space, also make inclusive
                terrain.ConvertPosition(Space.PointSpace, inVec, Space.TerrainSpace, ref outVec);
                float left = (outVec.x * compSize);
                float top = ((1.0f - outVec.y) * compSize); ;
                imgRect.Left = (long)left;
                imgRect.Top = (long)top;
                inVec.x = rect.Right - 1;
                inVec.y = rect.Top;// this is 'bottom' in image space
                terrain.ConvertPosition(Space.PointSpace, inVec, Space.TerrainSpace, ref outVec);
                float right = (outVec.x * (float)compSize + 1);
                imgRect.Right = (long)right;
                float bottom = ((1.0f - outVec.y) * compSize + 1);
                imgRect.Bottom = (long)bottom;

                imgRect.Left = System.Math.Max(0L, imgRect.Left);
                imgRect.Top = System.Math.Max(0L, imgRect.Top);
                imgRect.Right = System.Math.Min((long)compSize, imgRect.Right);
                imgRect.Bottom = System.Math.Min((long)compSize, imgRect.Bottom);

#warning enable rendercompositemap
#if false
                mParent.RenderCompositeMap(compSize, imgRect,
                    terrain.CompositeMapMaterial,
                    terrain.CompositeMap);
#endif
                update = true;

            }
            static bool update = false;