EEVEE: improve GGX NDF precision at small roughness

See !125919
2024-10-09 12:48:03 +02:00
parent 3db43b6705
commit 3d29979edf
1 changed files with 2 additions and 1 deletions
--- a/source/blender/draw/engines/eevee_next/shaders/eevee_bxdf_microfacet_lib.glsl
+++ b/source/blender/draw/engines/eevee_next/shaders/eevee_bxdf_microfacet_lib.glsl
@@ -16,7 +16,8 @@

 float bxdf_ggx_D(float NH, float a2)
 {
-  return a2 / (M_PI * square((a2 - 1.0) * square(NH) + 1.0));
+  float NH2 = square(NH);
+  return a2 / (M_PI * square((1.0 - NH2) + a2 * NH2));
 }

 float bxdf_ggx_smith_G1(float NX, float a2)