var FRONT = 0x1, BACK = 0x2, LEFT = 0x4, RIGHT = 0x8, FLOOR = 0x10, CEILING = 0x20
		FRONT_BACK = FRONT | BACK, LEFT_RIGHT = LEFT | RIGHT, FLOOR_CEILING = FLOOR | CEILING

var height_min = 200,
		height_max = 2000,
		side_min = 10,
		side_max = 5000,
		resize_margin = 8

var painting_distance_from_wall = 8

var wall_rotation = {}
wall_rotation[FRONT] = PI
wall_rotation[BACK] = 0
wall_rotation[LEFT] = HALF_PI
wall_rotation[RIGHT] = -HALF_PI






function sidesToString(sides){
	var s = ""
	if (sides & FRONT) s += "front "
	if (sides & BACK)  s += "back "
	if (sides & LEFT)  s += "left "
	if (sides & RIGHT) s += "right "
	return s
}

function side_direction (a, b) {
	if (a === b) return 0
	if ((a | b) === FRONT_BACK) return 0
	if ((a | b) === LEFT_RIGHT) return 0
	switch (a) {
		case FRONT:
			return b & LEFT ? -1 : 1
		case BACK:
			return b & RIGHT ? -1 : 1
		case LEFT:
			return b & FRONT ? -1 : 1
		case RIGHT:
			return b & BACK ? -1 : 1
	}
}