add 2d voronoi noise

5 files changed, 59 insertions, 4 deletions

diff --git a/3ner.shader b/3ner.shader
index 7c71bac..47fee80 100755
--- a/3ner.shader
+++ b/3ner.shader
@@ -962,6 +962,13 @@ Shader "yum_food/3ner"
         [HideInInspector] m_end_Aperiodic_Tiling("Aperiodic Tiling", Float) = 0
         //endex
 
+        //ifex _Zebra_Enabled==0
+        [HideInInspector] m_start_Zebra("Zebra", Float) = 0
+          [ThryToggle(_ZEBRA)] _Zebra_Enabled("Enable", Float) = 0
+          _Zebra_Scale("Scale", Float) = 1
+        [HideInInspector] m_end_Zebra("Zebra", Float) = 0
+        //endex
+
         //ifex _Custom31_World_Enabled==0
         [HideInInspector] m_start_Custom31_World("C31 World Gimmicks", Float) = 0
           [ThryToggle(_CUSTOM31_WORLD)] _Custom31_World_Enabled("Enable", Float) = 0
diff --git a/features.cginc b/features.cginc
index 793ac08..eb5d994 100755
--- a/features.cginc
+++ b/features.cginc
@@ -142,6 +142,10 @@
 #pragma shader_feature_local _APERIODIC_TILING_NORMALS
 //endex
 
+//ifex _Zebra_Enabled==0
+#pragma shader_feature_local _ZEBRA
+//endex
+
 //ifex _Custom31_World_Enabled==0
 #pragma shader_feature_local _CUSTOM31_WORLD
 #pragma shader_feature_local _CUSTOM31_WORLD_HEXAGONS
diff --git a/globals.cginc b/globals.cginc
index 098988e..97b8d1d 100755
--- a/globals.cginc
+++ b/globals.cginc
@@ -205,6 +205,10 @@ float _Aperiodic_Tiling_Normal_Strength;
 float _Aperiodic_Tiling_Normal_Thickness;
 #endif  // _APERIODIC_TILING_NORMALS
 
+#if defined(_ZEBRA)
+float _Zebra_Scale;
+#endif  // _ZEBRA
+
 #if defined(_CUSTOM31_WORLD)
 int _Custom31_World_Ray_March_Steps;
 float _Custom31_World_Ray_March_Min_Dist;
diff --git a/math.cginc b/math.cginc
index b79d9b6..514d21f 100755
--- a/math.cginc
+++ b/math.cginc
@@ -213,8 +213,39 @@ float3 domain_warp_3d_tex(Texture3D noise_tex, SamplerState s, float3 uvw,
   return noise;
 }
 
-// Return distance to the nearest cell edge in a Voronoi pattern.
-float voronoi_edge_distance(float3 x) {
+// Return distance to the nearest voronoi cell edge, clamped to [0, 0.5].
+// 0.5 is on the edge, 0 is far from it.
+float voronoi_d_2d(float2 x) {
+  float2 x_floor = floor(x);
+  float2 x_frac = frac(x);
+  float d1 = 1e6;
+  float d2 = 1e6;
+  float2 p1 = 0;
+  float2 p2 = 0;
+
+  for (int j = -1; j <= 1; j++) {
+    for (int i = -1; i <= 1; i++) {
+      float2 cell_offset = float2(i, j);
+      float2 r = cell_offset + hash22_fast(x_floor + cell_offset) - x_frac;
+      float d = dot(r, r);
+      if (d < d1) {
+        d2 = d1;
+        p2 = p1;
+        d1 = d;
+        p1 = r;
+      } else if (d < d2) {
+        d2 = d;
+        p2 = r;
+      }
+    }
+  }
+  float d = (d2 - d1) / (2.0f * max(1e-4, length(p2 - p1)));
+  return max(0.0f, 0.5f - d);
+}
+
+// Return distance to the nearest voronoi cell edge, clamped to [0, 0.5].
+// 0.5 is on the edge, 0 is far from it.
+float voronoi_d_3d(float3 x) {
   float3 x_floor = floor(x);
   float3 x_frac = frac(x);
   float d1 = 1e6;
@@ -240,7 +271,8 @@ float voronoi_edge_distance(float3 x) {
       }
     }
   }
-  return (d2 - d1) / (2.0 * max(1e-4, length(p2 - p1)));
+  float d = (d2 - d1) / (2.0f * max(1e-4, length(p2 - p1)));
+  return max(0.0f, 0.5f - d);
 }
 
 float median(float3 x) {
diff --git a/pbr.cginc b/pbr.cginc
index 91c22f4..facb8f5 100755
--- a/pbr.cginc
+++ b/pbr.cginc
@@ -162,7 +162,7 @@ void apply_kintsugi(float3 world_pos, inout float3 albedo, inout float smoothnes
   uvw += warp;
 #endif
 
-  float mask = voronoi_edge_distance(uvw) + 0.5f;
+  float mask = 1.0f - voronoi_d_3d(uvw);
   float width = max(fwidth(mask) * 0.5f, _Kintsugi_Width);
   float threshold = _Kintsugi_Threshold;
   mask = smoothstep(threshold - width, threshold + width, mask);
@@ -226,6 +226,13 @@ void apply_burley_tiling(inout Pbr pbr, inout float3 normal_tangent) {
 #endif  // _BURLEY_TILING
 }
 
+void apply_zebra(float2 uv, inout float3 albedo) {
+#if defined(_ZEBRA)
+  float mask = 2.0f * voronoi_d_2d(uv * _Zebra_Scale);
+  albedo = lerp(albedo, 0, mask);
+#endif
+}
+
 Pbr getPbr(v2f i) {
   Pbr pbr = (Pbr) 0;
 
@@ -288,6 +295,7 @@ Pbr getPbr(v2f i) {
   apply_triplanar_layers(i.worldPos, i.normal, pbr, normal_tangent);
   apply_custom31_world(i, pbr, normal_tangent);
   apply_aperiodic_tiling(i.uv01.xy, pbr.albedo.xyz, pbr.smoothness, normal_tangent);
+  apply_zebra(i.uv01.xy, pbr.albedo.xyz);
 
   applyDecals(i, pbr, normal_tangent);