Raycast 8x8 grid in FOV from camera

Questions & Answers
1

How do I fire rays from the camera in a 8x8 grid to cover the field of view?

I have an idea to make a portal occlusion system to make impossible geometry.

When a ray hits a portal, the sector is visible.

2

I’m using an 8x8 grid for my game as well!
Heres the code to select a tile:

private void UpdateSelection()
{
    if (!Camera.main) return;
    RaycastHit hit;
    float rayCastDistance = 25.0f;
    if (Physics.Raycast(Camera.main.ScreenPointToRay(Input.mousePosition), out hit, rayCastDistance))
    {
        selectionX = (int)hit.point.x;
        selectionY = (int)hit.point.z;
    }
    else
    {
        selectionX = -1;
        selectionY = -1;
    }
}

Mines using Cards on each tile so I send SelectionX and SelectionY into an 8x8 array containing their position shown here:

public void selectCardOnBoard(int x, int y)
    {
        if (cardPositions[x, y] == null)
        {
            //Debug.Log("Didn't work G");
        }
        if (selectedCard == null /*|| !selectedCard.moving || !selectedCard.attacking*/)
        {
            selectedCard = cardPositions[x, y];
            Debug.Log(cardPositions[x, y]);
        }
}

Hope this helps!