Raycasting

Question 1

How do you make a ray that starts at the camera and from the centre of the screen?

Answer 1

Camera camera = GetComponent();

Vector3 point = new Vector3(camera.pixelWidth/2, camera.pixelHeight/2, 0);

camera.ScreenPointToRay(point);

Question 2

How do you raycast with a given RaycastHit hit and Raycast Ray and print the location to the log?

Answer 2

if (Physics.Raycast(ray, out hit)) {
Debug.Log(hit.point)
}

Question 3

How do you check if the left mouse button is clicked?

Answer 3

Input.GetMouseButtonDown(0)

Returns boolean.

Question 4

What are rays and what is raycasting?

Answer 4

Rays are invisible lines that start at some origin and extends in a specific direction.

Raycasting finds out what intersects that ray.