Add instancing distance culling, scale deformation

* GPU instance distance culling now takes a min/max range
* Fold recovers ops from material, allowing state to persist across
  editor restarts
* Add scale node to vertex deformation framework
* Remove fold presets - dumb LLM idea, unused
* Drop more "undeform" code; unused, was for ray marching, which does
  not work well
* Fix reflection energy compensation; was using cloth math, which makes
  things too bright

1 files changed, 12 insertions, 11 deletions

diff --git a/brdf.cginc b/brdf.cginc
index 682f6a0..d44ce14 100755
--- a/brdf.cginc
+++ b/brdf.cginc
@@ -167,12 +167,13 @@ float4 brdf(Pbr pbr, LightData data) {
     cc_dfg = float3(1, 1, 1);
   }
   float cc_Ess = max(cc_dfg.y, 1e-4f);
-  float cc_energy_comp = 1.0f + cc_f0 * (rcp(cc_Ess) - 1.0f);
+  //float cc_energy_comp = 1.0f + cc_f0 * (rcp(cc_Ess) - 1.0f);
+  float cc_energy_comp = 1;
 #endif
 
   float3 f0_color = lerp(f0, pbr.albedo.xyz, pbr.metallic);
-  float Ess = max(dfg.y, 1e-4f);
-  float3 energy_comp = 1.0f + f0_color * (rcp(Ess) - 1.0f);
+  //float3 energy_comp = 1.0f + f0_color * (rcp(dfg.yyy) - 1.0f);
+  float3 energy_comp = 1.0f;
 
   // Direct
   {
@@ -247,18 +248,18 @@ float4 brdf(Pbr pbr, LightData data) {
     remainder -= Fcl * pbr.cl_strength;
 #endif
 
-    // Standard PBR IBL using split-sum approximation
-    // Specular lobe
+    // Standard split-sum IBL
     float3 f0_spec = lerp(f0, pbr.albedo.xyz, pbr.metallic);
+    //float3 ibl_specular_reflectance = f0_spec * dfg.x + dfg.y;
     float3 ibl_specular_reflectance = lerp(dfg.xxx, dfg.yyy, f0_spec);
-    float3 indirect_specular = data.indirect.specular * ibl_specular_reflectance * energy_comp;
-    const float3 F = F_Schlick(data.indirect.NoL, f0_spec, f90);
-    const float3 is_conserved = indirect_specular * F;
+    //float3 ibl_specular_reflectance = f0_spec * dfg.x;
+    float3 indirect_specular = data.indirect.specular * ibl_specular_reflectance;
+    
+    //return float4(data.indirect.specular, 1);
 
-    specular += is_conserved;
-    remainder = saturate(remainder - is_conserved);
+    specular += indirect_specular;
+    remainder = saturate(remainder - indirect_specular);
 
-    // Diffuse is Lambertian, which is pre-integrated into the SH diffuse probe
     float3 indirect_diffuse = pbr.albedo.xyz * data.indirect.diffuse * remainder * (1.0 - pbr.metallic);
     diffuse  += indirect_diffuse;
   }