raycast.md

title	category	layout	tags	prism_languages
Raycast	Physics	2017/sheet	Featured	csharp

Raycast

float distance = 0.5f;

if (Physics.Raycast(transform.position, transform.forward, out RaycastHit hit, distance)) {
    Debug.log("Hit some obstacle!");
}

RaycastHit hit;

// Unlike this example, most of the time you should pass a layerMask as the last option to hit only to the ground
if (Physics.Raycast(transform.position, -Vector3.up, out hit, distance)) {
   Debug.log("Hit something below!");
}

void FixedUpdate() {
    // Bit shift the index of the layer (8) to get a bit mask
    int layerMask = 1 << 8;

    // This would cast rays only against colliders in layer 8.
    // But instead we want to collide against everything except layer 8. The ~ operator does this, it inverts a bitmask.
    layerMask = ~layerMask;

    RaycastHit hit;
    // Does the ray intersect any objects excluding the player layer
    if (Physics.Raycast(transform.position, transform.TransformDirection(Vector3.forward), out hit, Mathf.Infinity, layerMask)) {
        Debug.DrawRay(transform.position, transform.TransformDirection(Vector3.forward) * hit.distance, Color.yellow);
        Debug.Log("Did Hit");
    }
}