Right now I'm using a super basic movement script to move an entity around and I'm limiting the entities position with clamp()'s.

This gives the effect of the entity being confined to a cube. It works, but, I need the boundary to be a sphere, not a cube. Kind of like moving an entity that is chained to a post, it shouldn't be able to move farther away than X in any direction.

I'm not quite sure how to do that! I could use some help

Maybe use vec_dist.

Code:

---

var chained_to_post_location[3];
var max_distance = 100;

vec_set(chained_to_post_location, vector(0,0,0));

if (vec_dist(chained_to_post_location, player.x) > max_distance)
{
  AllowedToMoveForward = 0;
}
else
{
  AllowedToMoveForward = 1;

---

This makes it that if the player is greater than a certain value away from a location, you can simply prohibit forward movement.

Just off the top of my head, so its not tested

Possibly, put an invisible hollow cylinder around the player or if the player steps outside the boundaries of the sphere (check using vec_dist), before the wait instruction move the entity to the boundary by moving it to the border of the cylinder in the direction it is from it's centre. Hope that makes sense.