public AABB stretch(double amtX, double amtY) {
		double minX, maxX, minY, maxY;
		if (amtX < 0) {
			minX = this.minX + amtX;
			maxX = this.maxX;
		} else {
			minX = this.minX;
			maxX = this.maxX + amtX;
		}
		if (amtY < 0) {
			minY = this.minY + amtY;
			maxY = this.maxY;
		} else {
			minY = this.minY;
			maxY = this.maxY + amtY;
		}
		return new AABB(minX, minY, minZ, maxX, maxY, maxZ);
	}