Creating local gravity areas in Unity3D

I'm trying to create dynamic gravity zones in Unity3D. This is different from simulating gravitational attraction.

Imagine a 10x10x10 cube on a platform in space. The body of this is a trigger, or zone, that simulates Earth's force of -9.81. Immediately off the platform, gravity does not exist. If something were thrown from this platform, it would receive relative force until it fell off, and then continue on forever. If someone slipped off this platform, they would be stranded.

If I use Rigidbodies and toggle the UseGravity bool on leaving/entering triggers, nothing seems to happen. As far as I can see, UseGravity does nothing. This would by far be the easiest solution though: simply apply universal gravity, but disable gravity on Rigidbodies leaving the Gravity Zone.

If I set Unity's gravity force to 0,0,0 then gravity is off, great, but I don't, see an efficient way to continue simulating gravity. I have attempted to add a ConstantForce component with 0,-9.81,0 Force, but that's not doing anything.

Any thoughts?

 

I guess to answer my own question:

Rigidbody.UseGravity does indeed have a valid purpose and it can be toggled off to act as if in space.

However, the CharacterController script will inhibit gravity and it must be applied manually. The dummy script in this works great.
https://docs.unity3d.com/ScriptReference/CharacterController.Move.html

You also have to use CharacterController.Move, not CharacterController.SimpleMove.

Reposting it here.

Code (CSharp):

1.     [RequireComponent(typeof(CharacterController))]
2.     public class PlayerController : MonoBehaviour {
3.         CharacterController characterController;
4.  
5.         public float speed = 6.0f;
6.         public float jumpSpeed = 8.0f;
7.         public float gravity = 20.0f;
8.  
9.         private Vector3 moveDirection = Vector3.zero;
10.  
11.         void Start() {
12.             characterController = GetComponent<CharacterController>();
13.         }
14.  
15.         void Update() {
16.             if (characterController.isGrounded) {
17.                 // We are grounded, so recalculate
18.                 // move direction directly from axes
19.  
20.                 moveDirection = new Vector3(Input.GetAxis("Horizontal"), 0.0f, Input.GetAxis("Vertical"));
21.                 moveDirection *= speed;
22.  
23.                 if (Input.GetButton("Jump")) {
24.                     moveDirection.y = jumpSpeed;
25.                 }
26.             }
27.  
28.             // Apply gravity. Gravity is multiplied by deltaTime twice (once here, and once below
29.             // when the moveDirection is multiplied by deltaTime). This is because gravity should be applied
30.             // as an acceleration (ms^-2)
31.             moveDirection.y -= gravity * Time.deltaTime;
32.  
33.             // Move the controller
34.             characterController.Move(moveDirection * Time.deltaTime);
35.         }
36.     }