Angle that gives the horizontal field of view. It's default value of 60
degrees corresponds to the field of view of the human eye. By decreasing this angle you'll
get a telescope effect.
1..175, -1..-175 (default: 60)
- If the arc has a negative value, the view is horizontally flipped. This way rear view mirrors can be realized.
If the view borders are not set in ISOMETRIC views, the arc defines the width of the isometric view box in quants by the formula width = view.size_x * 2 * tan(view.arc/2). For an arc of 90 degrees, the width of the view box is equal to twice the view.size_x in pixels.
if(mouse_right) // right mouse button pressed
camera.arc = max(camera.arc - time_step, 30); // reduce fiel of view
camera.arc = min(camera.arc + time_step, 90); // increase fiel of view
VIEW, aspect, view flags, left, right, up, down.