Fix: Cycles: Incorrect thin film IOR for backfacing Glass with OSL

Thanks to @main-menu-theme for noticing this!
2025-09-15 18:20:33 +02:00
parent ae7f3a0d18
commit 4eee95c0f9
1 changed files with 1 additions and 1 deletions
--- a/intern/cycles/kernel/osl/shaders/node_glass_bsdf.osl
+++ b/intern/cycles/kernel/osl/shaders/node_glass_bsdf.osl
@@ -18,8 +18,8 @@ shader node_glass_bsdf(color Color = 0.8,
  float r2 = clamp(Roughness, 0.0, 1.0);
  r2 = r2 * r2;
  float eta = max(IOR, 1e-5);
-  eta = backfacing() ? 1.0 / eta : eta;
  float thinfilm_ior = backfacing() ? ThinFilmIOR / eta : ThinFilmIOR;
+  eta = backfacing() ? 1.0 / eta : eta;
  color F0 = F0_from_ior(eta);
  color F90 = color(1.0);