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c#unity-game-enginescreenraycasting
Konrad
Konrad

Reputation: 24641

Unity3D casting ray from the middle of the screen

I want to cast ray from middle of the screen now I do it by using mouse and set the mouse in the middle but it can causes bugs. I use:

ray = Camera.main.ScreenPointToRay(Input.mousePosition);

What should I use instead?

Upvotes: 1

Views: 7270

Answers (1)

Mihai Dinculescu
Mihai Dinculescu

Reputation: 20033

In my experience I found that a Debug Ray (a ray which shows up in the Editor's Scene view) is a great help when working with Rays.

Vector3 rayOrigin = new Vector3(0.5f, 0.5f, 0f); // center of the screen
float rayLength = 500f;

// actual Ray
Ray ray = Camera.main.ViewportPointToRay(rayOrigin);

// debug Ray
Debug.DrawRay(ray.origin, ray.direction * rayLength, Color.red);

RaycastHit hit;
if (Physics.Raycast(ray, out hit, rayLength))
{
    // our Ray intersected a collider
}

The Debug Ray is only available in the Scene view, while the game is running. If you want to draw a line in-game, look into LineRenderer.

Upvotes: 4

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