fCraft.VanillaMapGenState.PlantShrooms C# (CSharp) Method

        void PlantShrooms() {
            Random shroomRand = new Random( random.Next() );
            int maxShrooms = genParams.MapWidth*genParams.MapLength*genParams.MapHeight/genParams.ShroomClusterDensity;
            for( int cluster = 0; cluster < maxShrooms; cluster++ ) {
                int shroomType = shroomRand.Next( 2 );
                int clusterX = shroomRand.Next( genParams.MapWidth );
                int clusterY = shroomRand.Next( genParams.MapLength );
                int clusterZ = shroomRand.Next( genParams.MapHeight );
                for( int shroom = 0; shroom < genParams.ShroomChainsPerCluster; shroom++ ) {
                    int x = clusterX;
                    int y = clusterY;
                    int z = clusterZ;
                    for( int hop = 0; hop < genParams.ShroomHopsPerChain; hop++ ) {
                        x += shroomRand.Next( genParams.ShroomSpreadHorizontal ) -
                             shroomRand.Next( genParams.ShroomSpreadHorizontal );
                        y += shroomRand.Next( genParams.ShroomSpreadHorizontal ) -
                             shroomRand.Next( genParams.ShroomSpreadHorizontal );
                        z += shroomRand.Next( genParams.ShroomSpreadVertical ) -
                             shroomRand.Next( genParams.ShroomSpreadVertical );
                        if( (x < 0) || (y < 0) || (z < 1) || (x >= genParams.MapWidth) || (y >= genParams.MapLength) ||
                            (z >= heightmap[(x + y*genParams.MapWidth)] - 1) )
                            continue;

                        int index = Index( x, y, z );
                        Block blockAbove = (Block)blocks[index];
                        if( blockAbove != Block.Air )
                            continue;
                        Block blockUnder = (Block)blocks[Index( x, y, z - 1 )];
                        if( blockUnder != Block.Stone )
                            continue;

                        if( shroomType == 0 ) {
                            blocks[index] = (byte)Block.BrownMushroom;
                        } else {
                            blocks[index] = (byte)Block.RedMushroom;
                        }
                    }
                }
            }
        }