Hi Pilou,

it's question for MAX, I have no experiences with script writing unfortunately. I've only analysed Max's script and analogically added new arrow types.
I've only noticed that arrows are created as polylines in Cartesian coordinate system and then it makes surface from polyline.
Position of text is done by vector of direction probably when the arrow line is created (from left to right and vice versa).

BTW Type 5 is can be used for radius measurement as well. In "unit" text box it has to be paste " R| "




Mik