Algodoo

Press enter to ignite your lightsaber! The lightsaber really ignites just like in the star wars movies. It is a simple mechanism. There are two springs(in a /\ shape fixated to two boxes in which one of the boxes is fixated to the two sides of the laser(which are long boxes) which is fixated to the laser ending point(which is a box) and the other box that pushes invisible circles with tracers attached to them with a light blue color. The boxes, circles, and fixjoints are all invisible by setting the opacity of them to high. The tracers' trail is set to fade in NaN seconds by doing so. Set all the polygons to no borders and voila! you have a lightsaber. Note that the saber I made is only a model, not a real one which you can attach to a ragdoll and it can fight. You can use the method I used to make one of those kind of sabers, only I glued the saber to the background, you wouldn't. Have fun!