Vec3 Color(Ray r, Hitable world, int depth)
{
HitRecord rec = new HitRecord();
if (depth > maxDepth)
{
return(depthColor);
}
if (!world.hit(r, 0.001, double.MaxValue, ref rec))
{
return(backgroundColor);
}
Vec3 reflectDir;
Vec3 reflectColor;
Vec3 refractDir;
Vec3 refractColor;
reflectDir = Vec3.unitVector(Vec3.reflect(r.b, rec.normal));
reflectColor = Color(new Ray(rec.p, reflectDir), world, depth + 1);
refractDir = new Vec3();
if (Vec3.refract(r.b, rec.normal, rec.material.ref_idx, ref refractDir))
{
refractDir = Vec3.unitVector(refractDir);
}
refractColor = Color(new Ray(rec.p, refractDir), world, depth + 1);
double diffuseLightIntensity = ambientLight;
double specularLightIntensity = 0;
for (int i = 0; i < lights.Count; i++)
{
Vec3 lightDir = Vec3.unitVector(lights[i].position - rec.p);
double lightDist = (lights[i].position - rec.p).length();
Vec3 shadowOrig = rec.p;
HitRecord shadowRec = new HitRecord();
if (world.hit(new Ray(shadowOrig, lightDir), 0.001, double.MaxValue, ref shadowRec) && (shadowRec.p - shadowOrig).length() < lightDist)
{
continue;
}
diffuseLightIntensity += lights[i].intensity * Math.Max(0.0, Vec3.dot(lightDir, rec.normal));
specularLightIntensity += Math.Pow(Math.Max(0.0, Vec3.dot(-Vec3.reflect(-lightDir, rec.normal), r.b)), rec.material.specularExponent) * lights[i].intensity;
}
return(rec.material.diffuseColor * diffuseLightIntensity * rec.material.a0 + new Vec3(1, 1, 1) * specularLightIntensity * rec.material.a1 + reflectColor * rec.material.a2 + refractColor * rec.material.a3);
}
Color color(zRay r, Hitable world, int depth)
{
hit_record rec = new hit_record();
if (world.hit(r, 0.0f, float.MaxValue, ref rec))
{
zRay scattered = new zRay();
Vector3 attenuation = Vector3.zero;
Color emitted = rec.mat.emitted();
if (depth < maxDepth && rec.mat.scatter(r, rec, ref attenuation, ref scattered))
{
return(emitted + new Color(attenuation.x, attenuation.y, attenuation.z) * color(scattered, world, depth + 1));
}
else
{
return(emitted);
}
}
else
{
//float t = 0.5f * (r.direction.normalized.y + 1f);
//return (1f - t) * Color.white + t * new Color(0.5f, 0.7f, 1.0f);
return(env_Color);
}
}
public override bool hit(zRay r, float t_min, float t_max, ref hit_record rec)
{
if (box.hit(r, t_min, t_max))
{
hit_record left_rec = new hit_record(), right_rec = new hit_record();
bool hit_left = left.hit(r, t_min, t_max, ref left_rec);
bool hit_right = right.hit(r, t_min, t_max, ref right_rec);
if (hit_left && hit_right)
{
if (left_rec.t < right_rec.t)
{
rec = left_rec;
}
else
{
rec = right_rec;
}
return(true);
}
else if (hit_left)
{
rec = left_rec;
return(true);
}
else if (hit_right)
{
rec = right_rec;
return(true);
}
else
{
return(false);
}
}
else
{
return(false);
}
}
public bool hit(Ray r, double tMin, double tMax, ref HitRecord rec)
{
if (box.hit(r, tMin, tMax))
{
HitRecord leftRec = new HitRecord();
HitRecord rightRec = new HitRecord();
bool hit_left = left.hit(r, tMin, tMax, ref leftRec);
bool hit_right = right.hit(r, tMin, tMax, ref rightRec);
if (hit_left && hit_right)
{
if (leftRec.t < rightRec.t)
{
rec = leftRec;
}
else
{
rec = rightRec;
}
return(true);
}
else
{
if (hit_left)
{
rec = leftRec;
return(true);
}
else if (hit_right)
{
rec = rightRec;
return(true);
}
}
}
return(false);
}
