Distance between objects (not between centres)?

Assuming that the 4 walls form a square or a rectangle, and that they are axis-aligned, you can use something like this:

distanceToWall1 = |(robot get-position)::x - (wall1 get-position)::x|.
distanceToWall2 = |(robot get-position)::z - (wall2 get-position)::z|.
distanceToWall3 = |(robot get-position)::x - (wall3 get-position)::x|.
distanceToWall4 = |(robot get-position)::z - (wall4 get-position)::z|.

I have thought in that solution, but it isn't good. If I want to change the scenario (for example adding other wall), I will have to modify this code...

I've chosen the follow solution:

+ to iterate:
vector_distance=wall raytrace from-location (robot get-location) with-direction (robot get-rotation)*(0,0,1).
if (vector_distance!=(0,0,0)){
robot turn.
}

In this way, if I change the scenario, the code will work.

Anyway, thanks for the help.

Have a look at the Raytracer.tz demo in the latest betas. I believe it should help do what you want.

- jon