mg/ray-tracer
1
0
Fork 0
mirror of https://github.com/MorizzG/ray-tracer.git synced 2025-12-06 04:22:42 +00:00
Code Issues Projects Releases Packages Wiki Activity Actions

fixed reflectance in Dielectric

Browse source
This commit is contained in:
Moritz Gmeiner 2023-12-31 13:47:03 +01:00
commit d49e7d0300
1 changed files with 6 additions and 5 deletions
Download patch file Download diff file Expand all files Collapse all files

11
src/material.h
View file

@ -86,17 +86,18 @@ class Dielectric : public Material {
Vec3 out_dir;
// Schlick approximation
constexpr auto reflectance = [](f64 cos, f64 eta) {
auto r0 = (1 - eta) / (1 + eta);
r0 = r0 * r0;
return r0 * (1 - r0) * std::pow(1 - cos, 5);
auto r = (1 - eta) / (1 + eta);
f64 r2 = r * r;
return r2 + (1 - r2) * std::pow(1 - cos, 5);
};
if (eta * sin_theta > 1.0 || reflectance(cos_theta, eta) > rand.GenUniform()) {
// can't refract, must reflect or Schlick approximation
// reflect
out_dir = in.direction().reflect(hit_record.normal);
} else {
// reflect
// refract
out_dir = in.direction().refract(hit_record.normal, eta);
}