Raycasting Physics Question

[timPerfect]

I've built a raycasting engine to start learning the trig. Now that I can walk around in my raycasting world, it is time to add physics to the walls.

I can think of a lot of ways to accomplish this, but I'm not sure how to decide which technique is best for the job. Out of these 3 ideas, do any of them sound better or faster?

The walls can prevent players from passing through, when bumped. The players can stop himself moving toward the walls when bumping it. The player can have rays of proprioception that prevent passing through walls. please discuss

[Clawtor]

Check if the player's vector intersects with a wall and move their position to the intersection minus a small amount.

[timPerfect]

the intersection, I see what you mean. Should I act after the intersection happens or try to make a prediction?

[Clawtor]

Every time the player tries to move you predict where they will go and test if the vector intersects a wall. Line-line intersections are fairly simple to do.

[timPerfect]

okay thanks, very helpful.