Invisable Projectile; Instantiate at Collisions

Questions & Answers
1

Hi, is there any way that I can instantiate something only at game objects that have a collider attached to it? I don't want to see the prefab travel, just instantiate at a collider (a wall).

For example, if the player is facing toward a wall that is far away and I click the fire key (Input.GetAxis("Fire")) the prefab would instantiate at the collision (the wall)?

public class InstPrefabs : MonoBehaviour {

    private void InstThePreFab() {
        Vector3 fwd = transform.TransformDirection(Vector3.forward);
        if (Physics.Raycast(transform.position, fwd, Mathf.Infinity)) {
            Instantiate(prefab, transform.position, Quaternion.Identity);
        }
    }
}

This is kinda funky.

What I have, is when anything (both raycasts and projectiles) collide with something then it plays the collision sound (which is the sound attached to the prefab in the audiosource).

2

Raycast, and instantiate what you like at RaycastHit.point.

3

Check out this similar question. It contain full code in C# to make a RayCollider. With minor modifications you can ask it to test ray when pressing button. You can then have code such as

void OnRayCollision(RayCollision collision)
{
    // spawn prefab at collision.hit.point
}