Hi Ditto,
MoI can use maths functions as input values also, so you can use the circumference of a circle formula **C=πxd** transpose it to **d=C/π** and to input your example into MoI you would write it as **57/pi** which will equate to a 18.144 diameter circle.
There are another maths functions that MoI uses here-> http://msdn.microsoft.com/en-us/library/shydc6ax.aspx
Cheers
~Danny~ |