A script to cut planes from where you mouseDown to mouseUp...

How would I make a script so it will draw a line from where I mouseDown to where I mouseUp and then cut a line through there. That way I could slice planes. And no, I'm not copying Fruit Ninja. My idea is to cut samurais up in a 2D platformer hybrid.

I know how to make the points but not how to draw a line between them and cut. I searched and found this forum topic. Sadly the site for demo is down and the guy didn't provide a source code or tutorial.

Anyone know how to do this?