Why is my raycast hitting "itself" ?

Unity Engine
,
1

Hi,

Here is my code:

        protected override void OnUpdate()
        {
            _collisionWorld = _physics.PhysicsWorld.CollisionWorld;

            Entities.ForEach((ref GroundCollide collide, ref Translation position) =>
            {
                RaycastInput input = new RaycastInput()
                {
                    Start = position.Value,
                    End = position.Value - math.up(),
                    Filter = new CollisionFilter()
                    {
                        BelongsTo = ~0u,
                        CollidesWith = ~0u,
                        GroupIndex = 0
                    }
                };

                RaycastHit hit = new RaycastHit();
                bool haveHit = _collisionWorld.CastRay(input, out hit);
                if (haveHit)
                {
                    var posi = hit.Position;
                    var distance = math.distance(posi, position.Value);
                    LoggerSystem.Log(posi + " << point... origin >> " + position.Value);

                    // if (distance >= 1.01)
                    // {
                    //     collide.IsGrounded = false;
                    // }
                    // else
                    // {
                    //     collide.IsGrounded = true;
                    // }

                    collide.IsGrounded = true;
                }
            });
        }

I want to build a simple “isGrounded” system, but position.Value is always printing the origin of the ray??

eg posi == position.Value;

What is wrong with my code?

2

It is likely hitting the collider of the character from inside, which an inside hit always returns a “fraction” of 0, meaning the hit occurs at the ray’s start.

3

Then why is the docu saying this?

Ray intersection starting inside spheres, capsules, box and convex shapes do not report an intersection as the ray leaves the volume.

4

You are looking at an old version of the doc. The updated doc clarifies this.

5

Where can i find the updated docs?

6

In theory if you open up the package manager, and select the proper package, the documentation link should take you to the proper doc of the version you have installed.

7

It’s also in your library folder in your project.

8

Thank you for pointing me in the right direction :slight_smile: