Color GetColorForTestAntialiasing(Ray ray, HitableList hitableList)
{
HitRecord record = new HitRecord();
if (hitableList.Hit(ray, 0f, float.MaxValue, ref record))
{
return(0.5f * new Color(record.normal.x + 1, record.normal.y + 1, record.normal.z + 1, 2));
}
float t = 0.5f * ray.normalDirection.y + 1f;
return((1 - t) * new Color(1, 1, 1) + t * new Color(0.5f, 0.7f, 1.0f));
}
Color GetColorForTestDiffusing(Ray ray, HitableList hitableList)
{
HitRecord record = new HitRecord();
if (hitableList.Hit(ray, 0.0001f, float.MaxValue, ref record))
{
Vector3 target = record.p + record.normal + GetRandomPointInUnitSphereForTestDiffusing();
//此处假定有50%的光被吸收，剩下的则从入射点开始取随机方向再次发射一条射线
return(0.5f * GetColorForTestDiffusing(new Ray(record.p, target - record.p), hitableList));
}
float t = 0.5f * ray.normalDirection.y + 1f;
return((1 - t) * new Color(1, 1, 1) + t * new Color(0.5f, 0.7f, 1f));
}
Color GetColorForTestDefocus(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 = GetColorForTestDefocus(r, hitableList, depth + 1);
return(new Color(c.r * attenuation.r, c.g * attenuation.g, c.b * attenuation.b));
}
else
{
//假设已经反射了太多次，或者压根就没有发生反射，那么就认为黑了
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, 1f));
}