How to create a laser?

Hi guys, I'm trying to create an infinite laser in Unity 2d. Either using raycasts or prefabs. I've tried using this video:

and this link: https://steredenn-game.tumblr.com/post/98397504410/steredenn-making-an-expandable-laser

But none of them have worked (In the first one the raycast didn't show the line, and in the second one my prefabs were pretty buggy, and didn't show in the right angle.

My goal is to achieve an infinite laser that adapts to angles and collides with objects
As the gif shows, but should shorten whenever is colliding with something

 

u need math and trig

 

Could you be a little more specific?

 

You should be able to use RaycastHit2D to help you with this. When you cast a ray you can get out the "hit" information. In fact, the RaycastHit.normal (not 2D) example shows an example that's highly similar to the problem you want to solve. Try that in 2D and you're off to the races.

 

u would also need to account for convex and non convex surface, decide how many laser bounces you require and handle laser hitting itself, is non trivial solution but most PTs use this in 3d space so possible.