Tutorial 26: updated PBR_Common.fxh

TheMostDiligent · TheMostDiligent · commit b8f7755da9aa · 2024-05-03T17:09:19.000-07:00
diff --git a/Tutorials/Tutorial26_StateCache/assets/PBR_Common.fxh b/Tutorials/Tutorial26_StateCache/assets/PBR_Common.fxh
@@ -190,7 +190,7 @@ float NormalDistribution_GGX(float NdotH, float AlphaRoughness)
     float a2  = AlphaRoughness * AlphaRoughness;
     float nh2 = NdotH * NdotH;
     float f   = nh2 * a2 + (1.0 - nh2);
-    return a2 / (PI * f * f);
+    return a2 / max(PI * f * f, 1e-9);
 }
 
 // https://google.github.io/filament/Filament.md.html#materialsystem/anisotropicmodel

Original file line number	Diff line number	Diff line change
`@@ -190,7 +190,7 @@ float NormalDistribution_GGX(float NdotH, float AlphaRoughness)`
`190`	`190`	`float a2 = AlphaRoughness * AlphaRoughness;`
`191`	`191`	`float nh2 = NdotH * NdotH;`
`192`	`192`	`float f = nh2 * a2 + (1.0 - nh2);`
`193`		`- return a2 / (PI * f * f);`
	`193`	`+ return a2 / max(PI * f * f, 1e-9);`
`194`	`194`	`}`
`195`	`195`
`196`	`196`	`// https://google.github.io/filament/Filament.md.html#materialsystem/anisotropicmodel`