jasmines

Hi, I'm a programmer and was just playing about with some AI for a game. There is a moving object http://www.ahappydea...oduct_31869.htm <b><b> which has a target point it is travelling to. It will travel to this point directly except it may need to evade a circular area. I'm trying to find the point to use as an intermediary target to evade the circle. Attached is an image which shows the situation. On that image: Point a is the target of the object Point b is the object itself Point c is the center point of the circle to avoid Point d is the point we're trying to find Points a, c and d are known The length of the dotted line dc is known The circle is probably not necessary. In my head ab and cd are perpendicular (??). The angle inside point c (ie the angle opposite ab within the triangle abc) is known. I'll call this theta just for a moment. In the triangle bcd the angle inside c (ie the angle opposite db) is half theta. I keep drawing lots of pretty pictures but haven't actually got anywhere with the problem! I could probably work it out if ab was parallel to the y axis (2d space) but I cannot guarantee that it will be so there's my problem! Any thoughts on the above? Thanks in advance, Kazatan </b></b> Attached Images