public static Vector3 RandomCosineDirection()
{
var r2 = Random.Get();
var phi = 2 * Mathf.PI * Random.Get();
return(new Vector3(Mathf.Cos(phi) * 2 * Mathf.Sqrt(r2), Mathf.Sin(phi) * 2 * Mathf.Sqrt(r2), Mathf.Sqrt(1 - r2)));
}
public override bool scatter(Ray rayIn, ref HitRecord hrec, ref ScatterRecord srec)
{
srec.is_specular = true;
srec.pdf = null;
//var origin = new Color32(1.0f, 1.0f, 1.0f);
//var result_c=new Color32(origin.r*color.r,,);
//srec.attenuation = new Color32(1.0f, 1.0f, 1.0f)*(color*color.a);
srec.attenuation = color;
//srec.attenuation.a = 1;
Vector3 outward_normal;
var reflected = Reflect(rayIn.direction, hrec.normal);
var refracted = new Vector3(0);
float ni_over_nt;
float cosine;
if (Vector3.Dot(rayIn.direction, hrec.normal) > 0)
{
outward_normal = -hrec.normal;
ni_over_nt = ref_idx;
cosine = ref_idx * Vector3.Dot(rayIn.direction, hrec.normal) / rayIn.direction.length();
}
else
{
outward_normal = hrec.normal;
ni_over_nt = 1.0f / ref_idx;
cosine = -Vector3.Dot(rayIn.direction, hrec.normal) / rayIn.direction.length();
}
var reflect_prob = Refract(rayIn.direction, outward_normal, ni_over_nt, ref refracted) ? Schlick(cosine, ref_idx) : 1.0f;
srec.specular_ray = Random.Get() < reflect_prob ? new Ray(hrec.p, reflected) : new Ray(hrec.p, refracted);
return(true);
}
protected Vector3 GetRandomPointInUnitSphere()
{
var p = new Vector3(0);
do
{
p = new Vector3(Random.Get(), Random.Get(), Random.Get()) * 2.0f - Vector3.one;
}while (Vector3.Dot(p, p) >= 1);
return(p.Normalized());
}
private void Scanner(object o)
{
var config = (ScannerConfig)o;
for (; 0 < scaned[config.ID];)
{
if (STOP)
{
return;
}
if (scaned[config.ID] == SPP)
{
SetPixelPriview(config, Color32.White);
}
for (var h = config.h; h < config.h + block_size; h++)
{
if (h >= height)
{
continue;
}
for (var w = config.w; w < config.w + block_size; w++)
{
if (w >= width)
{
continue;
}
var id = h * width + w;
var color = mode == Mode.Shaded
? DiffuseScanner.GetColor(Scene.main.camera.CreateRay(
(width - w + Random.Get()) * recip_width,
(height - h + Random.Get()) * recip_height, id), Scene.main.world,
Scene.main.Important, 0).DeNaN()
: NormalMapScanner.GetColor(Scene.main.camera.CreateRay(
(width - w + Random.Get()) * recip_width,
(height - h + Random.Get()) * recip_height, h * width + w), Scene.main.world);
SetPixel(w, h, color);
}
}
scaned[config.ID]--;
if (scaned[config.ID] == 0)
{
FinishedChunks++;
if (config.ID == divide_h * divide_h - 1)
{
FirstRound = true;
}
SetPixelPriview(config, Color32.Transparent);
chunk_end?.Invoke(FinishedChunks);
aliveBlocks.Remove(config.point);
if (FinishedChunks == divide_w * divide_h)
{
MessageBox.Show("渲染完成", "渲染器");
}
else if (FirstRound)
{
var h = aliveBlocks[0].y;
var w = aliveBlocks[0].x;
ThreadPool.QueueUserWorkItem(Scanner,
new ScannerConfig(w * block_size, h * block_size, h * divide_w + w, aliveBlocks[0]));
}
}
}
}
public Ray CreateRay(float x, float y, int id)
{
if (radius == 0f)
{
return(new Ray(position, low_left_corner + x * horizontal + y * vertical - position, time0 + Random.Get() * (time1 - time0), id));
}
var rd = radius * GetRandomPointInUnitDisk();
var offset = rd.x * u + rd.y * v;
return(new Ray(position + offset, low_left_corner + x * horizontal + y * vertical - position - offset, time0 + Random.Get() * (time1 - time0), id));
}
private static Vector3 GetRandomPointInUnitDisk()
{
var p = 2f * new Vector3(Random.Get(), Random.Get(), 0) - new Vector3(1, 1, 0);
return(p.Normalized() * Random.Get());
}
public static LightSource GetRandom() => lights[(int)(Random.Get() * (lights.Count - 0.1f))];
