public static SceneDescription AreaLight(bool secondLight)
{
var lightTransform = Transform.LookAt(new Point3 <float>(0.5f, 0.75f, -0.5f), new Point3 <float>(0, 0, 0), new Vector3 <float>(0, 1, 0)).Inverse();
var lightShape = new Disk(lightTransform, 0.75f);
var light = new DiffuseAreaLight(lightTransform, new Spectrum(5), lightShape, 1, true);
var lightTransform2 = Transform.LookAt(new Point3 <float>(-1, -1.5f, -1f), new Point3 <float>(0, 0, 0), new Vector3 <float>(0, 1, 0)).Inverse();
var lightShape2 = new Disk(lightTransform2, 3);
var light2 = new DiffuseAreaLight(lightTransform2, new Spectrum(1, 0.07f, 0.57f), lightShape2, 1, true);
var primitives = new List <Primitive>()
{
new GeometricPrimitive(new Sphere(Transform.Translate(0, 0, 0), 0.5f), new MatteMaterial(new Spectrum(1), 0)),
//new GeometricPrimitive(new Disk(Transform.Translate(0, -1f, 0), 2), new MatteMaterial(new Spectrum(1), 0)),
new GeometricPrimitive(lightShape, new MatteMaterial(new Spectrum(1), 0), light)
};
if (secondLight)
{
primitives.Add(new GeometricPrimitive(lightShape2, new MatteMaterial(new Spectrum(1), 0), light2));
}
var lights = new List <Light>()
{
light
};
if (secondLight)
{
lights.Add(light2);
}
return(new SceneDescription(new PrimitiveList(primitives), lights, OrthographicCamera.Create(new Point3 <float>(0, 0, -5))));
}
public static SceneDescription LargeAreaLight()
{
var lightTransform = Transform.LookAt(new Point3 <float>(0.5f, 1.5f, 0), new Point3 <float>(0, 0, 0), new Vector3 <float>(0, 1, 0)).Inverse();
var lightShape = new Disk(lightTransform, 4);
var light = new DiffuseAreaLight(lightTransform, new Spectrum(5), lightShape, 1, true);
var primitives = new List <Primitive>()
{
new GeometricPrimitive(new Disk(Transform.Translate(0, -1, 0) * Transform.RotateX(90), 1.5f), new MatteMaterial(new Spectrum(1), 0)),
new GeometricPrimitive(new Sphere(Transform.Translate(-0.75f, -0.5f, 0), 0.25f), new MatteMaterial(new Spectrum(1, 0, 0), 0)),
new GeometricPrimitive(new Sphere(Transform.Translate(0, -0.25f, 0), 0.25f), new MatteMaterial(new Spectrum(0, 1, 0), 0)),
new GeometricPrimitive(new Sphere(Transform.Translate(0.75f, 0, 0), 0.25f), new MatteMaterial(new Spectrum(1, 1, 0), 0)),
new GeometricPrimitive(lightShape, new MatteMaterial(new Spectrum(1), 0), light)
};
var lights = new List <Light>()
{
light
};
return(new SceneDescription(new PrimitiveList(primitives), lights, PerspectiveCamera.Create(new Point3 <float>(0, 1, -1), 100)));
}
public static void RowTestByDelegate(int spp, string fileSuffix, Func <float, int, IMaterial> materialFunc)
{
var dx = 3.65f;
var nX = 11;
var delta = 1f / (nX - 1);
var prims = new List <IPrimitive>();
for (var x = 0; x < nX; x++)
{
var s1t = Transform.Translate(x * dx, 0, 0);
var s1 = new Sphere(s1t, Transform.Invert(s1t), false, 1.5f, -1.5f, 1.5f, 360);
var s1g = new GeometricPrimitive(s1, materialFunc(delta * x, x + 1), null);
prims.Add(s1g);
}
var slt = Transform.Translate(5, 2, -4);
var slg = new Sphere(slt, Transform.Invert(slt), false, 0.5f, -0.5f, 0.5f, 360);
var ls = Spectrum.FromBlackbodyT(7500);
var dl = new DiffuseAreaLight(slt, null, ls * 100, 20, slg);
var sg = new GeometricPrimitive(slg, new MatteMaterial(new ConstantTexture <Spectrum>(ls), new ConstantTexture <float>(0f), null), dl);
prims.Add(sg);
var bvh = new BVH(prims.ToArray(), SplitMethod.HLBVH);
var mid = bvh.WorldBounds.Centroid;
var width = 1200;
var height = 140;
var from = new Point(mid.X, 6f, -12f);
var to = mid;
var fov = 5.6f;
var aspectRatio = (float)width / height;
var transform = Transform.Translate(mid.X, 0f, -50f);
var dist = Point.Distance(from, to);
var filter = new MitchellFilter(new Vector2(2.5f, 2.5f), 0.7f, 0.15f);
var film = new Film(new PixelVector(width, height), new Bounds2D(0, 0, 1, 1), filter, 20f, 1f);
var camera = PerspectiveCamera.Create(transform, aspectRatio, 0.0f, dist, fov, film);
//var integrator = new WhittedIntegrator(4, camera, new HaltonSampler(spp, film.GetSampleBounds()),
// film.CroppedBounds);
var integrator = new PathIntegrator(3, camera, new HaltonSampler(spp, film.GetSampleBounds()),
film.CroppedBounds, 6f, LightSampleStrategy.Spatial);
film.SetSink(new Sink(Environment.GetFolderPath(Environment.SpecialFolder.MyPictures), "row_" + fileSuffix));
var lt = Transform.Translate(mid.X - 60, 200, -80);
var s = Spectrum.FromBlackbodyT(4500) * 100000f;
var pl1 = new PointLight(lt, null, s);
lt = Transform.Translate(mid.X + 100, 100, -200);
s = Spectrum.FromBlackbodyT(2200) * 50000f;
var pl2 = new PointLight(lt, null, s);
lt = Transform.Translate(mid.X, 1000f, 0);
s = Spectrum.FromBlackbodyT(7000) * 5f;
var pl3 = new DistantLight(lt, s, new Vector(0, -0.5f, 1));
lt = Transform.Translate(mid.X, 10, -300);
s = Spectrum.FromBlackbodyT(5500) * 100000f;
var pl4 = new PointLight(lt, null, s);
var splt = Transform.RotateX(MathF.Rad(18f)).RotateY(MathF.Rad(75)).Translate(0, 10, -8);
s = Spectrum.FromBlackbodyT(5500) * 100000f;
var sl = new SpotLight(splt, null, s, 5f, 2f);
var scene = new Scene(bvh, new ILight[] { pl1, pl2, pl3, pl4, dl, sl });
//var scene = new Scene(bvh, new ILight[] { dl });
Console.WriteLine("Rendering at {0}x{1}...", width, height);
var stopwatch = new Stopwatch();
stopwatch.Start();
integrator.Render(scene);
stopwatch.Stop();
Console.WriteLine("Done ({0})", stopwatch.Elapsed);
}
