Detect 3D collision side

Questions & Answers
1

Hi, I need to know which side my capsule collider hit an object (which can be front, back, left, right, top and bottom).

You guys know any script I can use for it?

Thank you!

2

Your best bet here is ContactPoint.
You can have normal of the contact and point of the contact.
I believe, having normal of the contact is better, since it gives a nice Vector3 and with vector transformations, you can have any desired information.

3

Use Transform.InverseTransformPoint on the ContactPoint.point to convert it to local space and then you can use basic logic to determine what region it hit.

void OnCollisionEnter(Collision collision) {
    Vector3 localContactPoint = transform.InverseTransformPoint(Pointcollision.contacts[0].point);

    if(localContactPoint.y > topLimit) hitTop();
    if(localContactPoint.y < bottomLimit) hitBottom();
    if(localContactPoint.z > frontLimit) hitFront();
    if(localContactPoint.z < backLimit) hitBack();
}

This is just a very general example, but I hope it illustrates what I’m trying to say.