Libgdx implementing shooting (collision between bullet and objects)

Question

I am new to 3D programming, just started yesterday.
I am just trying to create a simple game, where i move in 3D space, but collision detection works in 2D top down space, cause my character can't jump. So collision happens only on X and Z axis.
But now i think about implementing shooting, where the bullet flies in the direction my camera is pointing (first person camera). But i have no idea how shooting is normaly implemented in 3D games? Is a Bullet an object, which is drawn, like in many 2D games, and moved at high speed? Or is it just a line, which isn't even shown sometimes? And how can i check for collision with that line without iterating throught all walls and mobs? I know you can find the areas throught which the bullet flies, but isn't this a big calculation when the line can go in every direction in 3D space?

Answer 1

Depends if you want to show the bullet, then you can make a bullet model and make it move very fast.

These are good options each one better than the previous

• You can check for collisions iterating all the objects.
• You can have all the objects in nodes that have a reference to their neighbors and check collisions on them
• Same as previous, but you take into account the direction vector of the bullet and only check the neighbors that are in front of it.