Why would a collider.Raycast not register a hit when collider.bounds.IntersectRay does?

Questions & Answers
1

I’m having trouble getting a raycast to work. I attach the following script to a cube object. The ray it creates intersects the bounds of the cube. The bounds of the collider detects the ray’s intersection, but the collider itself doesn’t register a hit when raycasted. What might cause the raycast to return false?

using UnityEngine;
using System.Collections;

public class RaycastTest : MonoBehaviour {
	
	// Update is called once per frame
	void Update () {
		// Make a ray that definitely intersects our box collider
		Ray ray = new Ray(gameObject.collider.bounds.center, Vector3.one);
		Debug.DrawLine (ray.origin, ray.origin + ray.direction, Color.red);
		
		// Cast the ray three different ways, expecting all to return true;
		RaycastHit hitInfo;
	    bool hitBounds = gameObject.collider.bounds.IntersectRay(ray);
	   	bool hitCollider = gameObject.collider.Raycast(ray, out hitInfo, ray.direction.magnitude);
	   	bool hitAnyCollider = Physics.Raycast(ray, out hitInfo);
		
		// Expecting all hits to be true always
	   	Debug.Log (ray.ToString () + hitBounds.ToString () + hitCollider.ToString () + hitAnyCollider.ToString ());
		// hitBounds is always true.  
		// hitCollider and hitAnyCollider are always false.  Why?
	}
}

The box collider’s IsTrigger=false.
The cube is not on the IgnoreRaycast layer.

2

Colliders, like meshes, are one sided. Casting from inside a cube outward will not generate a hit. You have to cast from outside the cube towards the cube to get a hit. If you describe what you are trying to accomplish, maybe I can suggest an alternate method.