private List <IHittable> BvhPreprocess()
{
Hittables.Clear();
var planes = new List <IHittable>();
var hittablesToBvh = new List <IHittable>();
foreach (var model in Models)
{
if (model is Plane || model is Cylinder)
{
planes.Add(model);
}
else
{
hittablesToBvh.AddRange(((IHittable)model).Preprocess());
}
}
Hittables.AddRange(planes);
if (hittablesToBvh != null && hittablesToBvh.Count > 0)
{
var node = new BvhNode(hittablesToBvh, 0, hittablesToBvh.Count);
Hittables.Add(node);
}
return(Hittables);
}
public BvhNode(Hitable[] hitables, int start, int length, float time0, float time1)
{
// TODO recursive -> iteration loop
IComparer <Hitable> comparer = null;
switch ((int)(3.0f * Util.UnitRandFloat()))
{
case 0:
comparer = Boundary.compareX;
break;
case 1:
comparer = Boundary.compareY;
break;
case 2:
default:
comparer = Boundary.compareZ;
break;
}
System.Array.Sort(hitables, start, length, comparer);
var halfLength = length / 2;
switch (length)
{
case 1:
left_ = hitables[start];
right_ = hitables[start];
break;
case 2:
left_ = hitables[start];
right_ = hitables[start + 1];
break;
default:
left_ = new BvhNode(hitables, start, halfLength, time0, time1);
right_ = new BvhNode(hitables, start + halfLength, length - halfLength, time0, time1);
break;
}
var boxLeft = left_.BoundingBox(time0, time1);
if (!boxLeft.IsValid())
{
Debug.Log("no bounding box detected.");
}
var boxRight = right_.BoundingBox(time0, time1);
if (!boxRight.IsValid())
{
Debug.Log("no bounding box detected.");
}
boundary_ = Boundary.SurroundingBoundary(boxLeft, boxRight);
}
public static Model CreateFromBvh(BvhNode node)
{
// add nodes
var model = new Model(Coordinates.Vrm1);
model.Root.Name = "__bvh_root__";
AddBvhNodeRecursive(model, model.Root, node);
return(model);
}
public static Model CreateFromBvh(BvhNode node)
{
// add nodes
var model = new Model(Coordinates.Gltf)
{
Root = new Node("__bvh_root__"),
};
AddBvhNodeRecursive(model, model.Root, node);
return(model);
}
private Hitable[] OneWeekScene()
{
var center = new Vector3(4.0f, 2.0f, 0.0f);
var position = new Vector3(0.0f, -1000.0f, 0.0f);
var hitables = new List <Hitable>(500);
hitables.Add(new Sphere(position, -position.y, new Lambertian(0.5f * Vector3.one)));
float radius = 0.2f;
var dielectric = new Dielectric(1.5f);
for (int a = -11; a < 11; ++a)
{
for (int b = -11; b < 11; ++b)
{
position.Set(a + 0.9f * Util.UnitRandFloat(), radius, b + 0.9f * Util.UnitRandFloat());
if ((position - center).sqrMagnitude <= 0.81)
{
continue;
}
var chooseMat = Util.UnitRandFloat();
if (chooseMat < 0.8f)
{
// hitables.Add(new Sphere(position, radius, new Lambertian(new Vector3(Util.UnitRandFloat(), Util.UnitRandFloat(), Util.UnitRandFloat()))));
hitables.Add(new MovingSphere(position, position + new Vector3(0.0f, 0.5f * Util.UnitRandFloat(), 0.0f), 0.0f, 1.0f, radius, new Lambertian(new Vector3(Util.UnitRandFloat(), Util.UnitRandFloat(), Util.UnitRandFloat()))));
continue;
}
if (chooseMat < 0.95f)
{
hitables.Add(new Sphere(position, radius,
new Metal(new Vector3(0.5f * (1.0f + Util.UnitRandFloat()), 0.5f * (1.0f + Util.UnitRandFloat()), 0.5f * (1.0f + Util.UnitRandFloat())),
0.5f * (1.0f + Util.UnitRandFloat()))));
continue;
}
hitables.Add(new Sphere(position, radius, dielectric));
}
}
radius = 1.0f;
position.Set(0.0f, 1.0f, 0.0f);
hitables.Add(new Sphere(position, radius, dielectric));
position.Set(-4.0f, 1.0f, 0.0f);
hitables.Add(new Sphere(position, radius, new Lambertian(new Vector3(0.4f, 0.2f, 0.1f))));
position.Set(4.0f, 1.0f, 0.0f);
hitables.Add(new Sphere(position, radius, new Metal(new Vector3(0.7f, 0.6f, 0.5f), 0.0f)));
var retval = new Hitable[1];
retval[0] = new BvhNode(hitables.ToArray(), 0, hitables.Count, 0.0f, 1.0f);
return(retval);
}
static void BuildHierarchy(Transform parent, BvhNode node, float toMeter)
{
var go = new GameObject(node.Name);
go.transform.localPosition = node.Offset.ToXReversedVector3() * toMeter;
go.transform.SetParent(parent, false);
//var gizmo = go.AddComponent<BoneGizmoDrawer>();
//gizmo.Draw = true;
foreach (var child in node.Children)
{
BuildHierarchy(go.transform, child, toMeter);
}
}
static void AddBvhNodeRecursive(Model model, Node parent, BvhNode node)
{
var newNode = new Node(node.Name)
{
HumanoidBone = node.Bone,
};
model.Nodes.Add(newNode);
parent.Add(newNode);
newNode.Translation = node.SkeletonLocalPosition;
foreach (var child in node.Children)
{
AddBvhNodeRecursive(model, newNode, child);
}
}
static BvhNode GetNode(BvhNode root, string path)
{
var splitted = path.Split('/');
var it = splitted.Select(x => x).GetEnumerator();
var current = root;
if (splitted[0] == path)
{
return(current);
}
it.MoveNext();
while (it.MoveNext())
{
current = current.Children.First(x => x.Name == it.Current);
}
return(current);
}
public static void Main(string[] args)
{
var aspect = 1;
//var generator = new RandomWorld();
//var generator = new TwoSpheres();
//var generator = new PerlinTest();
//var generator = new EarthTest();
//var generator = new SimpleLightTest();
//var generator = new RectTest();
//var generator = new CornellBox();
//var generator = new CornellSmoke();
var generator = new NextWeekScene();
var imageWidth = 400;
var imageHeight = (int)(imageWidth / aspect);
var cam = generator.GetCamera(aspect);
var objects = generator.Generate();
var world = new BvhNode(objects, 0, objects.Count, 0, 1);
var start = DateTime.Now;
var image = new Image(imageWidth, imageHeight);
var samplesPerPixel = 1024;
var maxDepth = 50;
var linesRemaining = imageHeight;
//for(var y = 0; y < image.Height; y++)
Parallel.For(0, image.Height, y =>
{
var lineStart = DateTime.Now;
for (var x = 0; x < image.Width; x++)
{
Vec3 pixelColor = Vec3.Zero;
//var sampleOffsets = Vec3.GenerateWhite2DNoise((int) Math.Sqrt(samplesPerPixel));
var sampleOffsets = Vec3.GenerateJittered2DNoise((int)Math.Sqrt(samplesPerPixel));
var sampleWeights = Vec3.GenerateConstantSampleWeights((int)Math.Sqrt(samplesPerPixel));
for (var i = 0; i < sampleOffsets.Count; i++)
{
var u = (x + sampleOffsets[i].x) / (imageWidth - 1);
var v = (y + sampleOffsets[i].y) / (imageHeight - 1);
var ray = cam.GetRay(u, v);
pixelColor += ray.GetColor(world, maxDepth, cam.Background) * sampleWeights[i];
}
image.SetPixel(x, y, pixelColor.GammaCorrected());
}
Interlocked.Decrement(ref linesRemaining);
var lineTime = DateTime.Now - lineStart;
Console.WriteLine($"Lines remaining: {linesRemaining}, last line time: {lineTime}");
});
var end = DateTime.Now;
var diff = end - start;
Console.WriteLine($"Render Time: {diff}");
Console.WriteLine($"Num Rays: {Ray.RayCount}");
Console.WriteLine($"Rays per second: {Ray.RayCount / diff.TotalSeconds}");
var file = $"render-{DateTime.Now:yyyyMMdd-HH_mm_ss}.ppm";
image.WriteToPpm(file);
}
