Switch to Fibonacci for Disney profile sampling

Assets/ScriptableRenderPipeline/HDRenderPipeline/Material/Lit/Resources/CombineSubsurfaceScattering.shader

                     {
                         // Everything except for the radius is a compile-time constant.
                         float  r   = _FilterKernelsNearField[profileID][i][0];
-                        float  phi = TWO_PI * VanDerCorputBase2(i);
+                        float  phi = TWO_PI * Fibonacci2d(i, SSS_N_SAMPLES_NEAR_FIELD).y;
                         float2 pos = r * float2(cos(phi), sin(phi));
 
                         samplePosition = posInput.unPositionSS + pos * scaledPixPerMm;

Assets/ScriptableRenderPipeline/HDRenderPipeline/Material/Lit/SubsurfaceScatteringProfile.cs

     {
         public const int SSS_N_PROFILES           = 16;  // Max. number of profiles, including the slot taken by the neutral profile
         public const int SSS_NEUTRAL_PROFILE_ID   = SSS_N_PROFILES - 1; // Does not result in blurring
-        public const int SSS_N_SAMPLES_NEAR_FIELD = 64; // Used for extreme close ups; must be a power of 2
-        public const int SSS_N_SAMPLES_FAR_FIELD  = 32; // Used at a regular distance; must be a power of 2
+        public const int SSS_N_SAMPLES_NEAR_FIELD = 55; // Used for extreme close ups; must be a Fibonacci number
+        public const int SSS_N_SAMPLES_FAR_FIELD  = 34; // Used at a regular distance; must be a Fibonacci number
         public const int SSS_TRSM_MODE_NONE       = 0;
         public const int SSS_TRSM_MODE_THIN       = 1;
     }

Assets/ScriptableRenderPipeline/HDRenderPipeline/Material/Lit/SubsurfaceScatteringProfile.cs.hlsl

 //
 #define SSS_N_PROFILES (16)
 #define SSS_NEUTRAL_PROFILE_ID (15)
-#define SSS_N_SAMPLES_NEAR_FIELD (64)
-#define SSS_N_SAMPLES_FAR_FIELD (32)
+#define SSS_N_SAMPLES_NEAR_FIELD (55)
+#define SSS_N_SAMPLES_FAR_FIELD (34)
 #define SSS_TRSM_MODE_NONE (0)
 #define SSS_TRSM_MODE_THIN (1)