Simplify spherical harmonics

Implement standard SH9 as a learning exercise. Drop poi's fancy SH9
code. Realize that we just want diffuse and lock everything else away
behind a ui-inaccessible #define.

1 files changed, 0 insertions, 61 deletions

diff --git a/poi.cginc b/poi.cginc
index df89bbf..cc12b1a 100644
--- a/poi.cginc
+++ b/poi.cginc
@@ -57,72 +57,11 @@ float3 HSVtoRGB(in float3 HSV)
   return ((RGB - 1) * HSV.y + 1) * HSV.z;

 }

 

-float shEvaluateDiffuseL1Geomerics_local(float L0, float3 L1, float3 n)

-{

-  // average energy

-  float R0 = max(0, L0);

-

-  // avg direction of incoming light

-  float3 R1 = 0.5f * L1;

-

-  // directional brightness

-  float lenR1 = length(R1);

-

-  // linear angle between normal and direction 0-1

-  //float q = 0.5f * (1.0f + dot(R1 / lenR1, n));

-  //float q = dot(R1 / lenR1, n) * 0.5 + 0.5;

-  float q = dot(normalize(R1), n) * 0.5 + 0.5;

-  q = saturate(q); // Thanks to ScruffyRuffles for the bug identity.

-

-  // power for q

-  // lerps from 1 (linear) to 3 (cubic) based on directionality

-  float p = 1.0f + 2.0f * lenR1 / R0;

-

-  // dynamic range constant

-  // should vary between 4 (highly directional) and 0 (ambient)

-  float a = (1.0f - lenR1 / R0) / (1.0f + lenR1 / R0);

-

-  return R0 * (a + (1.0f - a) * (p + 1.0f) * pow(q, p));

-}

-

-half3 BetterSH9(half4 normal)

-{

-  float3 indirect;

-  float3 L0 = float3(unity_SHAr.w, unity_SHAg.w, unity_SHAb.w) + float3(unity_SHBr.z, unity_SHBg.z, unity_SHBb.z) / 3.0;

-  indirect.r = shEvaluateDiffuseL1Geomerics_local(L0.r, unity_SHAr.xyz, normal.xyz);

-  indirect.g = shEvaluateDiffuseL1Geomerics_local(L0.g, unity_SHAg.xyz, normal.xyz);

-  indirect.b = shEvaluateDiffuseL1Geomerics_local(L0.b, unity_SHAb.xyz, normal.xyz);

-  indirect = max(0, indirect);

-  indirect += SHEvalLinearL2(normal);

-  return indirect;

-}

-

 float calculateluminance(float3 color)

 {

   return color.r * 0.299 + color.g * 0.587 + color.b * 0.114;

 }

 

-float3 getPoiLightingDirect(float3 normal) {

-  float3 magic = max(BetterSH9(normalize(unity_SHAr + unity_SHAg + unity_SHAb)), 0);

-  float3 normalLight = _LightColor0.rgb + BetterSH9(float4(0, 0, 0, 1));

-

-  float magiLumi = calculateluminance(magic);

-  float normaLumi = calculateluminance(normalLight);

-  float maginormalumi = magiLumi + normaLumi;

-

-  float magiratio = magiLumi / maginormalumi;

-  float normaRatio = normaLumi / maginormalumi;

-

-  float target = calculateluminance(magic * magiratio + normalLight * normaRatio);

-  float3 properLightColor = magic + normalLight;

-  float properLuminance = calculateluminance(magic + normalLight);

-  return properLightColor * max(0.0001, (target / properLuminance));

-}

-

-float3 getPoiLightingIndirect() {

-  return BetterSH9(float4(0, 0, 0, 1));

-}

-

 bool SceneHasReflections()

 {

   float width, height;