Draw path player follow in 3d

I want to draw path let player follow,player is 3d!!I want to mouse click player mouse drag can create line,mouse up player can move Can give me some reference examples? I am currently used Trail Renderer to draw the line,but line soon disappear I want line when player Passing just disappear!!Similar to this game:http://www.youtube.com/watch?v=kv-_9KfwJt8