From 2d205f1f5df12b6e66f6cca1a05152b18d53c0d1 Mon Sep 17 00:00:00 2001 From: yum Date: Mon, 23 Feb 2026 17:35:40 -0800 Subject: Fix IBL DFG term --- brdf.cginc | 12 +++++------- 1 file changed, 5 insertions(+), 7 deletions(-) diff --git a/brdf.cginc b/brdf.cginc index 8a3b2ff..42ab988 100755 --- a/brdf.cginc +++ b/brdf.cginc @@ -166,15 +166,13 @@ float4 brdf(Pbr pbr, LightData data) { remainder = saturate(remainder - indirect_specular_cc); #endif - float3 base_color = lerp(1, pbr.albedo.xyz, pbr.metallic); - float3 specular_dfg = lerp(dfg.xxx, dfg.yyy, f0); - float3 ibl_specular_reflectance = specular_dfg * base_color; - float3 indirect_specular = data.indirect.specular * ibl_specular_reflectance; - - return float4(specular_dfg, 1); + float3 specular_tint = lerp(1, pbr.albedo.xyz, pbr.metallic); + // Filament whitepaper section 5.3.4.6 + float3 specular_dfg = dfg.xxx * f0 + dfg.yyy; + float3 indirect_specular = specular_tint * data.indirect.specular * specular_dfg; specular += indirect_specular; - remainder = saturate(remainder - indirect_specular); + //remainder = saturate(remainder - indirect_specular); float3 indirect_diffuse = pbr.albedo.xyz * data.indirect.diffuse * remainder * (1.0 - pbr.metallic); diffuse += indirect_diffuse; -- cgit v1.2.3