struct MapBlockMinimapColumn
{
	video::SColor surface_color;
	u16 surface_level;
	bool surface_present;
	u16 surface_node_id;
	u16 air_nodes_count;
	u16 surface_light;
};

struct MapBlockMinimapData
{
	MapBlockMinimapColumn data[MAP_BLOCKSIZE*MAP_BLOCKSIZE];
};


	// prepare data for minimap
	if (g_settings->getBool("enable_minimap")) {
		v3s16 p = data->m_blockpos * MAP_BLOCKSIZE;
		for(s16 x = 0; x < MAP_BLOCKSIZE; x++) {
			for(s16 z = 0; z < MAP_BLOCKSIZE; z++){
				bool surface_found = false;
				s16 surface_level = 0;
				s16 air_count = 0;
				MapBlockMinimapColumn* column = &m_minimap_data->data[x + z * MAP_BLOCKSIZE];
				for(s16 y = MAP_BLOCKSIZE -  1; y > -1 ; y--){
					MapNode &n = data->m_vmanip.getNodeRefUnsafe(v3s16(p.X + x,p.Y + y, p.Z + z));
					if (!surface_found && n.param0 != CONTENT_IGNORE && n.param0 != CONTENT_AIR) {
						column->surface_node_id = n.param0;
						surface_found = true;
						surface_level = y;
					} else if (n.param0 == CONTENT_AIR) {
						air_count++;
					}
				}
				if (!surface_found) {
					column->surface_node_id = CONTENT_AIR;
				}
				column->surface_level = surface_level;
				column->surface_present = surface_found;
				column->air_nodes_count = air_count;
			}
		}
	}