static private Texture2D rayTrace(Texture2D texture)
{
const int ns = 100;
var world = Util.random_scene();
var lookfrom = new Vector3(12, 2, 3);
var lookat = new Vector3(0, 0.5f, 0);
var dist_to_focus = (lookfrom - lookat).magnitude;
var aperture = 0.1f;
var cam = new camera(lookfrom, lookat, new Vector3(0, 1, 0), 20, (float)texture.width / texture.height, aperture, dist_to_focus);
for (var j = texture.height - 1; j >= 0; j--)
{
for (var i = 0; i < texture.width; i++)
{
var col = Color.black;
for (var s = 0; s < ns; s++)
{
var u = (i + Random.Range(0f, 1f - float.Epsilon)) / texture.width;
var v = (j + Random.Range(0f, 1f - float.Epsilon)) / texture.height;
var r = cam.get_ray(u, v);
col += color(r, world, 0);
}
col /= ns;
col = new Color(Mathf.Sqrt(col.r), Mathf.Sqrt(col.g), Mathf.Sqrt(col.b));
texture.SetPixel(i, j, col);
}
}
return(texture);
}