diff --git a/modules/hex_wave.frag b/modules/hex_wave.frag
index 6c0e4c2..6f204df 100644
--- a/modules/hex_wave.frag
+++ b/modules/hex_wave.frag
@@ -77,7 +77,8 @@ void main() {
     if (wf > 0.01 && edgeFactor > 0.0) {
         // Vary shimmer color across theme gradient using angle + position
         float angle = atan(p.y, p.x);
-        float t = fract((angle + 3.14159) / 6.28318 + center.x * 0.003 + center.y * 0.005);
+        float rawT = fract((angle + 3.14159) / 6.28318 + center.x * 0.003 + center.y * 0.005);
+        float t = abs(rawT * 2.0 - 1.0);  // triangle wave → uC0→uC1→uC2→uC1→uC0, no hard jump
         vec3 shimmerColor = themeGradient(t);
 
         float shimmer = edgeFactor * wf;