public (bool, HitRecord) Hit(Ray ray, double tmin, double tmax)
{
bool anyHits = false;
var closestOne = tmax;
HitRecord result = new HitRecord();
foreach (var hittable in this)
{
var(hit, temp) = hittable.Hit(ray, tmin, closestOne);
if (hit)
{
anyHits = true;
closestOne = temp.T;
result = temp;
}
}
return(anyHits, result);
}
public override bool Scatter(Scene scene, Ray ray, HitRecord hit, out Attenuation attenuation, out Ray scattered)
{
var direction = Vector3.Normalize(ray.direction);
Vector3 reflected = Vector3.Reflect(direction, hit.normal);
scattered = new Ray(hit.position, reflected + fuzz * Sphere.RandomInUnitSphere());
Vector3 diffuseColor = Vector3.Zero;
Vector3 SpecularColor = Vector3.Zero;
foreach (var light in scene.lights)
{
if (CastShadow(scene, light, hit))
{
continue;
}
Vector3 lightDir = -Vector3.Normalize(hit.position - light.position);
Vector3 reflectDir = Vector3.Reflect(-lightDir, hit.normal);
diffuseColor += light.color * light.insensity * Vector3.Dot(hit.normal, lightDir);
SpecularColor += light.color * light.insensity * specularIndex *
MathF.Pow(Math.Clamp(Vector3.Dot(reflectDir, -direction), 0, 1), glossIndex);
}
//环境光 + 光源
var textureColor = GetTextureColor(hit.uv);
var allColor = (scene.ambientColor + diffuseColor) * albedo * textureColor + SpecularColor;
attenuation = Attenuation.Blend(allColor, blendPercent, albedo * textureColor);
attenuation.attenuationType = attenuationType;
//兼容easyPipeline
if (fuzz == 0 && specularIndex == 1)
{
attenuation.forceToDoAnotherPass = true;
}
//attenuation = Attenuation.None(new Vector3(hit.uv.X, hit.uv.Y,0));
return(true);//(Vector3.Dot(scattered.direction, hit.normal) > 0);
}
public override bool Hit(Ray ray, float tMin, float tMax, out HitRecord rec)
{
rec = null;
bool hitAnything = false;
float closestSoFar = tMax;
foreach (var ob in fragments)
{
if (ob.Hit(ray, tMin, tMax, out HitRecord recTemp))
{
hitAnything = true;
if (closestSoFar > recTemp.t)
{
closestSoFar = recTemp.t;
rec = recTemp;
}
}
}
return(hitAnything);
}
public bool Hit(Ray ray, out HitRecord rec, float tMin = 0.001f, float tMax = 10000)
{
rec = null;
bool hitAnything = false;
float closestSoFar = tMax;
foreach (var ob in hitableObjects)
{
if (ob.Hit(ray, tMin, tMax, out HitRecord recTemp))
{
hitAnything = true;
if (closestSoFar > recTemp.t)
{
closestSoFar = recTemp.t;
rec = recTemp;
}
}
}
return(hitAnything);
}
private Color32 Diffusing(Ray ray, HitableList hitableList, int depth)
{
var record = new HitRecord();
if (hitableList.Hit(ray, 0.0001f, float.MaxValue, ref record))
{
var r = new Ray(Vector3.zero, Vector3.zero);
var attenuation = Color32.black;
if (depth < MAX_SCATTER_TIME && record.material.scatter(ray, record, ref attenuation, ref r))
{
var c = Diffusing(r, hitableList, depth + 1);
return(new Color32(c.r * attenuation.r, c.g * attenuation.g, c.b * attenuation.b));
}
else
{
return(Color32.black);
}
}
var t = 0.5f * ray.normalDirection.y + 1f;
return((1 - t) * new Color32(1, 1, 1) + t * new Color32(0.5f, 0.7f, 1));
}
public (bool isHit, HitRecord hitDetail) Hit(Ray ray, double tmin, double tmax)
{
var oc = ray.Origin - _center;
var a = ray.Direction.LengthSquared();
var halfB = Vector.Dot(oc, ray.Direction);
var c = oc.LengthSquared() - _radius * _radius;
var discriminant = halfB * halfB - a * c;
if (discriminant < 0)
{
return(false, new HitRecord());
}
var sqrtd = Math.Sqrt(discriminant);
var root = (-halfB - sqrtd) / a;
if (root < tmin || tmax < root)
{
root = (-halfB + sqrtd) / a;
if (root < tmin || tmax < root)
{
return(false, new HitRecord());
}
}
var hit = new HitRecord();
hit.T = root;
hit = GetHitPoint(ray, hit);
var outwardNormal = (hit.Point - _center) / _radius;
hit.SetFaceNormal(ray, outwardNormal);
return(true, hit);
}
public abstract bool Scatter(ref Ray ray, ref HitRecord hit, out Vector3 attenuation, out Ray scattered);
public abstract bool Hit(Ray r, float tMin, float tMax, out HitRecord rec);
public override bool Hit(Ray r, float tMin, float tMax, out HitRecord rec)
{
//Plane plane = Plane.CreateFromVertices(points[0], points[1], points[2]);
var normal = Vector3.Normalize(Vector3.Cross((points[0] - points[1]), (points[1] - points[2])));
r.direction = Vector3.Normalize(r.direction);
rec = new HitRecord();
//面片背面剔除
var cos = Vector3.Dot(r.direction, normal);
if (cos == 0)
{
return(false);
}
if (cullBack && cos < 0)
{
return(false);
}
//计算t（距离）
rec.t = Vector3.Dot(points[0] - r.from, normal) / Vector3.Dot(r.direction, normal);
//rec.t = (Vector3.Dot(normal,points[0]) - Vector3.Dot(normal, r.from) )/ Vector3.Dot(normal,r.direction );
if (float.IsNaN(rec.t) || rec.t < tMin || rec.t > tMax)
{
return(false);
}
//计算p（平面交点）
var p = r.from + rec.t * r.direction;
//光栅剔除
points.Add(points[0]);
Vector3 firstTowards = Vector3.Zero;
for (int i = 0; i < points.Count - 1; i++)
{
var oa = Vector3.Normalize(points[i] - points[i + 1]);
var op = Vector3.Normalize(points[i] - p);
var towards = Vector3.Normalize(Vector3.Cross(oa, op));
if (firstTowards == Vector3.Zero)
{
firstTowards = towards;
}
else if (Vector3.Dot(firstTowards, towards) < 0.999999)
{
points.RemoveAt(points.Count - 1);
return(false);
}
}
points.RemoveAt(points.Count - 1);
rec.position = p;
//是否有normal记录
if (normals.Count == points.Count)
{
if (uvs.Count == 3)
{
rec.normal = GetAvgNormalInTriangle(p);
}
else
{
rec.normal = GetAvgNormal(p);
}
}
else
{
rec.normal = normal;
}
//是否有uv记录
if (uvs.Count == points.Count)
{
if (uvs.Count == 3)
{
rec.uv = GetAvgUVInTriangle(p);
}
else
{
rec.uv = GetAvgUV(p);
}
}
rec.material = material;
return(true);
}
public abstract bool Scatter(Scene scene, Ray ray, HitRecord hit, out Attenuation attenuation, out Ray scattered);
