I am a student. My master degree topic is - Finding the optimal position of irradiation isocenters in an irregularly shaped large volume tumor. So the problem in radiotherapy is when tumor is longer than 40 cm (lung tumor). So when tumor is bigger need to mark two isocenters. So came with the idea, if you draw any irregular shape and draw from each vertex a very thin line to all vertex; example: in the center where the lines croses most, there will be visible line. After that all I need is to gain all those dots in center, mark them, count the distance, divide it in for equal parts, and I will have two isocenters. After that I still have to do some countings, but first things first. Is it possible? Or I need to look for other tools? Can someone help me? (p.s. It would be great if someone told me how to export all coordinates of each vertices, at leats what i can do is draw a shape, get coordinates of vertices and export them to *.csv file, after that I can yous matlab to draw a lines) By the way, maybe there is an easier way to draw a middle line in any 3D irregular shape?