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View Full Version : Help with drawing a line that follows an object?



eratic-magician
04-07-2017, 03:43 PM
I'm attempting to make a "bullet trail" (that's just a red line that follows my bullet object) but I'm unsure on how to do this. Basically, I have a bullet mesh that is created in front of the player on click and then is moved by setting it's bulletRigidBody's velocity (so it's fired like a regular bullet). Since, it moves so fast, I want to draw a line that follows the bullet's path until it stops. How can I do this?

I'm unfamiliar with drawing lines in OpenGL, but I thought the process would be something along these lines:
*When bullet is created, start line at its world position
*Each frame, as the bullet moves, extend line to new world position
*Set the line to a certain length so that it doesn't end up too long
*When bullet stops moving, delete the line

How would I go about this with regards to code? Thanks.

Here's an example of what I want to achieve: https://www.youtube.com/watch?v=Wm6Q7a3ThTY&t=60s