diff --git a/shaders/twister.fs b/shaders/twister.fs
index 3f81c7c..9e560c5 100644
--- a/shaders/twister.fs
+++ b/shaders/twister.fs
@@ -8,19 +8,19 @@ in vec2 vsoTexCoord;
 out vec4 fragColor;
 
 // Fonction de déformation
-vec2 deform(float progression) {
+vec2 deform(float it) {
   vec2 center = vec2(0.5);
   vec2 offset = vsoTexCoord - center;
 
   // Torsion
-  float angle = offset.y * progression * radians(180) * 2;
+  float angle = offset.y * it * radians(180) * 2;
   float cosTheta = cos(angle);
   float sinTheta = sin(angle);
   vec2 twistedOffset = vec2(cosTheta * offset.x - sinTheta * offset.y, sinTheta * offset.x + cosTheta * offset.y);
 
   // Vague
   float wave = sin(twistedOffset.y * 20);
-  vec2 deformedUV = twistedOffset + vec2(wave * progression, 0);
+  vec2 deformedUV = twistedOffset + vec2(wave * it, 0);
 
   return center + deformedUV;
 }