public static Color[] CreateColorFromHitRecord(int width, int height)
{
var camera = new RayTraceCamera(Vector3.zero, new Vector3(0f, 0f, -1f), Vector3.up, 90f, 2f, 0f, 1f);
var colors = new Color[width * height];
var hitableList = new HitableList();
hitableList.List.Add(new Sphere(new Vector3(0, 0, -1), 0.5f, new Lambertian(Color.white)));
hitableList.List.Add(new Sphere(new Vector3(0, -100.5f, -1), 100f, new Lambertian(Color.white)));
for (int j = height - 1; j >= 0; j--)
{
for (int i = 0; i < width; i++)
{
var color = new Color();
for (int s = 0; s < SamplingNumber; s++)
{
var u = (i + Random.Range(0, 1f)) / width;
var v = (j + Random.Range(0, 1f)) / height;
var r = camera.GetRay(u, v);
color += GetColorFromHitRecord(r, hitableList);
}
color /= SamplingNumber;
colors[i + j * width] = new Color(Mathf.Sqrt(color.r), Mathf.Sqrt(color.g), Mathf.Sqrt(color.b), 1f);
}
}
return(colors);
}
static HitableList GetHitableListFromScene()
{
var hitableList = new HitableList();
hitableList.List.Add(new Sphere(new Vector3(0f, -1000f, 0f), 1000f, new Lambertian(new Color(0.5f, 0.5f, 0.5f))));
for (int a = -4; a < 4; a++)
{
for (var b = -4; b < 4; b++)
{
var chooseMat = Random.Range(0f, 1f);
var center = new Vector3(a + 0.9f * Random.Range(0f, 1f), 0.2f, b + 0.9f * Random.Range(0f, 1f));
if (Vector3.Distance(center, new Vector3(4f, 0.2f, 4f)) > 0.9f)
{
if (chooseMat < 0.8f)
{
hitableList.List.Add(new Sphere(center, 0.2f, new Lambertian(GetRandomColor())));
}
else if (chooseMat < 0.95f)
{
hitableList.List.Add(new Sphere(center, 0.2f, new Metal(GetRandomMatalColor())));
}
else
{
hitableList.List.Add(new Sphere(center, 0.2f, new Dielectirc(1.5f)));
}
}
}
}
hitableList.List.Add(new Sphere(new Vector3(0f, 1f, 0f), 1f, new Dielectirc(1.5f)));
hitableList.List.Add(new Sphere(new Vector3(-4f, 1f, 0f), 1f, new Lambertian(new Color(0.4f, 0.2f, 0.5f))));
hitableList.List.Add(new Sphere(new Vector3(4f, 1f, 0f), 1f, new Metal(new Color(0.7f, 0.6f, 0.5f))));
return(hitableList);
}
static HitableList GetHitableListFromSimpleScene()
{
var hitableList = new HitableList();
hitableList.List.Add(new Sphere(new Vector3(0, 0, -1), 0.5f, new Lambertian(new Color(0.8f, 0.3f, 0.3f))));
hitableList.List.Add(new Sphere(new Vector3(0, -100.5f, -1), 100f, new Lambertian(new Color(0.8f, 0.8f, 0f))));
hitableList.List.Add(new Sphere(new Vector3(1, 0, -1f), 0.5f, new Metal(new Color(0.8f, 0.6f, 0.2f))));
hitableList.List.Add(new Sphere(new Vector3(-1, 0, -1f), 0.5f, new Dielectirc(1.2f)));
return(hitableList);
}
static Color GetColorFromHitRecord(Ray ray, HitableList list)
{
var rec = new HitRecord();
if (list.Hit(ray, 0.001f, float.MaxValue, ref rec))
{
var target = rec.Point + rec.Normal + RayTraceUtility.GetRandomPointInUnitSphere();
return(0.5f * GetColorFromHitRecord(new Ray(rec.Point, target - rec.Point), list));
}
var t = (ray.NormalizedDirection.y + 1f) * 0.5f;
return((1 - t) * Color.white + t * new Color(0.5f, 0.7f, 1f));
}
static Color GetColorForTestMetal(Ray ray, HitableList hitableList, int depth)
{
HitRecord record = new HitRecord();
if (hitableList.Hit(ray, 0.0001f, float.MaxValue, ref record))
{
Ray r = new Ray(Vector3.zero, Vector3.zero);
Color attenuation = Color.black;
if (depth < MAX_SCATTER_TIME && record.material.Scatter(ray, record, ref attenuation, ref r))
{
Color c = GetColorForTestMetal(r, hitableList, depth + 1);
return(new Color(c.r * attenuation.r, c.g * attenuation.g, c.b * attenuation.b));
}
return(Color.black);
}
float t = 0.5f * ray.normalDirection.y + 1f;
return((1 - t) * new Color(1, 1, 1) + t * new Color(0.5f, 0.7f, 1));
}
public static Color[] MakeColors()
{
int width = CreatPNG.WIDTH;
int height = CreatPNG.HEIGHT;
//视锥体的左下角、长宽和起始扫射点设定
Vector3 lowLeftCorner = new Vector3(-2, -1, -1);
Vector3 horizontal = new Vector3(4, 0, 0);
Vector3 vertical = new Vector3(0, 2, 0);
Vector3 original = new Vector3(0, 0, 0);
int l = width * height;
HitableList hitableList = new HitableList();
hitableList.AddHitable(new HitableSphere(new Vector3(0, 0, -1), 0.5f, new Lambert(new Color(0.8f, 0.3f, 0.3f))));
hitableList.AddHitable(new HitableSphere(new Vector3(0, -100.5f, -1), 100f, new Lambert(new Color(0.8f, 0.8f, 0.0f))));
hitableList.AddHitable(new HitableSphere(new Vector3(1, 0, -1), 0.5f, new Metal(new Color(0.8f, 0.6f, 0.2f))));
hitableList.AddHitable(new HitableSphere(new Vector3(-1, 0, -1), 0.5f, new Metal(new Color(0.8f, 0.8f, 0.8f))));
Color[] colors = new Color[l];
for (int j = height - 1; j >= 0; j--)
{
for (int i = 0; i < width; i++)
{
Color color = new Color(0, 0, 0);
for (int s = 0; s < SAMPLETIMES; s++)
{
Ray r = new Ray(original,
lowLeftCorner + horizontal * ((j + Random.Range(0, 1f)) / (float)width) +
vertical * ((i + Random.Range(0, 1f)) / (float)height));
color += GetColorForTestMetal(r, hitableList, 0);
}
color /= SAMPLETIMES;
//为了使球体看起来更亮，改变gamma值
color = new Color(Mathf.Sqrt(color.r), Mathf.Sqrt(color.g), Mathf.Sqrt(color.b), 1f);
color.a = 1f;
colors[i + j * width] = color;
}
}
return(colors);
}
static Color GetColorFromHitRecord(Ray ray, HitableList list, int depth)
{
var record = new HitRecord();
if (list.Hit(ray, 0.001f, float.MaxValue, ref record))
{
var scatterdRay = new Ray(Vector3.zero, Vector3.zero);
var attenuation = Color.black;
if (depth < MaxDepth && record.Material.Scatter(ray, record, ref attenuation, ref scatterdRay))
{
var c = GetColorFromHitRecord(scatterdRay, list, depth + 1);
return(new Color(c.r * attenuation.r, c.g * attenuation.g, c.b * attenuation.b));
}
else
{
return(Color.black);
}
}
var t = (ray.NormalizedDirection.y + 1f) * 0.5f;
return((1 - t) * Color.white + t * new Color(0.5f, 0.7f, 1f));
}