function _getDistanceBetweenPoints2D(x1, y1, x2, y2)
	return math.sqrt((x1-x2)^2+(y1-y2)^2)
end


function _getDistanceBetweenPoints3D(x1, y1, z1, x2, y2, z2)
    return math.sqrt(math.sqrt((z1-z2)^2+(y1-y2)^2)^2+(x1-x2)^2)
end