diff --git a/10/tmp/barcode.frag b/10/tmp/barcode.frag
index ba8c44b..ea70b86 100644
--- a/10/tmp/barcode.frag
+++ b/10/tmp/barcode.frag
@@ -9,7 +9,8 @@ uniform vec2 u_resolution;
 uniform float u_time;
 
 float random (in float x) { return fract(sin(x)*43758.5453); }
-float random (in vec2 st) { return fract(sin(dot(st.xy ,vec2(12.9898,78.233))) * 43758.5453); }
+// float random (in vec2 st) { return fract(sin(dot(st.xy ,vec2(12.9898,78.233))) * 43758.5453); }
+float random (vec2 p) { return fract(1e4 * sin(17.0 * p.x + p.y * 0.1) * (0.1 + abs(sin(p.y * 13.0 + p.x)))); }
 
 float binChar (vec2 ipos, float n) {
     float remain = mod(n,33554432.);