zebra: pull in phacelle noiseHEADmaster

1 files changed, 12 insertions, 2 deletions

diff --git a/pbr.cginc b/pbr.cginc
index facb8f5..29bcedb 100755
--- a/pbr.cginc
+++ b/pbr.cginc
@@ -228,8 +228,18 @@ void apply_burley_tiling(inout Pbr pbr, inout float3 normal_tangent) {
 
 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);
+  //float theta = 0.25 * PI;
+  //float theta = _Time[1];
+  float theta = _Zebra_Angle * TAU;
+  uv.x *= _Zebra_X_Scale;
+  float st, ct;
+  sincos(theta, st, ct);
+  float4 phacelle = phacelle_noise_2d(uv * _Zebra_Scale, float2(ct, st));
+  float2 dir = phacelle.xy;
+  float2 ortho_dir = phacelle.zw;
+  float mask = dot(dir, float2(0, 1));
+  float mask_fw = fwidth(mask);
+  albedo = smoothstep(-mask_fw * 0.5, mask_fw * 0.5, mask);
 #endif
 }