static Sphere ReadSphere(IEnumerable <String> ts)
{
var ns = from t in ts
let p = OptParse(t)
where p.HasValue
select p.Value;
if (ns.Count() < 9)
{
throw new ApplicationException("Expected 9 values for a sphere.");
}
var vs = ns.Take(9).ToArray();
return(new Sphere()
{
Center = Vector.Make(vs[0], vs[1], vs[2]),
Radius = vs[3],
Surface = new Surface()
{
Diffuse = pos => Color.Make(vs[4], vs[5], vs[6]),
Specular = pos => Color.Make(.5, .5, .5),
Reflect = pos => vs[7],
Roughness = 200 * vs[8]
}
});
}
static Camera ReadCamera(IEnumerable <String> ts)
{
var ns = from t in ts
let p = OptParse(t)
where p.HasValue
select p.Value;
if (ns.Count() < 6)
{
throw new ApplicationException("Expected 6 values for a camera.");
}
var vs = ns.Take(6).ToArray();
return(Camera.Create(Vector.Make(vs[0], vs[1], vs[2]), Vector.Make(vs[3], vs[4], vs[5])));
}
internal static ((int, int), Scene) ReadScene(String fileName)
{
var os = new List <SceneObject>();
var ls = new List <Light>();
var c = Camera.Create(Vector.Make(3, 2, 4), Vector.Make(-1, 0.5, 0));
var v = (600, 600);
foreach (var l in File.ReadAllLines(fileName))
{
var ts = l.Split(' ', '\t');
if (ts.Length <= 0)
{
continue;
}
switch (ts[0])
{
default:
break;
case "#":
continue;
case "sphere":
os.Add(ReadSphere(ts.Skip(1)));
break;
case "light":
ls.Add(ReadLight(ts.Skip(1)));
break;
case "camera":
c = ReadCamera(ts.Skip(1));
break;
case "view":
v = ReadView(ts.Skip(1));
break;
}
}
return(v, new Scene()
{
Things = os.ToArray(), Lights = ls.ToArray(), Camera = c
});
}
static Light ReadLight(IEnumerable <String> ts)
{
var ns = from t in ts
let p = OptParse(t)
where p.HasValue
select p.Value;
if (ns.Count() < 6)
{
throw new ApplicationException("Expected 6 values for a light.");
}
var vs = ns.Take(6).ToArray();
var n = vs.Skip(3).Max();
if (n < 1.0)
{
n = 1.0;
}
return(new Light()
{
Pos = Vector.Make(vs[0], vs[1], vs[2]),
Color = Color.Make(vs[3] / n, vs[4] / n, vs[5] / n)
});
}