How can I cast a ray from a ragdolls child bone? And disable the rest

Questions & Answers
1

I know you can cast a ray from the rigidbody, but if i am using a ragdoll with a lot of rigidbodies and colliders, how can I choose only one part of the armature, lets say the hips(I mean the hips green collider), to check collision with the ground.
But only raycast from this bone and disable all the rest of the raycasts?

Like this:
25082-raycast.png

I have this script that raycasts to check if the character is grounded

void IsGrounded()
{

    RaycastHit hitInfo;
    if (Physics.Raycast(transform.position + Vector3.up * 0.8f, Vector3.down * 0.5f, out hitInfo, Mathf.Infinity))
     
    {
        if (hitInfo.distance > 0.1f) // Change .1f to what you need
            Debug.DrawRay(transform.position + Vector3.up * 5f, Vector3.down * 5f, Color.green);

            isgrounded = false;

        if (hitInfo.distance < 0.1f)
            isgrounded = true;
    }

}
2

Raycasts aren’t “from” any particular object. The first input, where they start, is just an xyz, anywhere in space.

In your example, it looks up the player’s location and tweaks it a little. But transform.position + Vector3.up * 0.8f is just an xyz. If you increased 0.8, the raycast would kind of be from the head, but really just from where-ever the math said.

If you want the raycast to start from the hips, just look up their position in the usual way, and use that as the first input. If you aren’t sure, search around UA for “finding game objects” or “finding children.”

To ignore other body parts, a raycast can be made to hit only certain types of things, and ignore the rest. The official name for an object’s “type” is a layer. Raycasting and layers also has lots of explanation in UA.