diff --git a/orx-fx/src/commonMain/kotlin/distort/Perturb.kt b/orx-fx/src/commonMain/kotlin/distort/Perturb.kt
index 84befc74..0770430d 100644
--- a/orx-fx/src/commonMain/kotlin/distort/Perturb.kt
+++ b/orx-fx/src/commonMain/kotlin/distort/Perturb.kt
@@ -19,6 +19,9 @@ class Perturb : Filter(mppFilterShader(fx_perturb, "perturb")) {
     @DoubleParameter("phase", -2.0, 2.0, order = 1)
     var phase: Double by parameters
 
+    @DoubleParameter("radius", 0.0, 2.0, order = 1)
+    var radius: Double by parameters
+
     /**
      * lacunarity is the amount by which scale is modulated per octave, default is Vector3(2.0, 2.0, 2.0)
      */
@@ -62,6 +65,7 @@ class Perturb : Filter(mppFilterShader(fx_perturb, "perturb")) {
         ySegments = 0
         outputUV = false
         offset = Vector2.ZERO
+        radius = 1.0
 
     }
     var bicubicFiltering = true
diff --git a/orx-fx/src/shaders/glsl/distort/perturb.frag b/orx-fx/src/shaders/glsl/distort/perturb.frag
index ec3f4311..b0213d2b 100644
--- a/orx-fx/src/shaders/glsl/distort/perturb.frag
+++ b/orx-fx/src/shaders/glsl/distort/perturb.frag
@@ -2,6 +2,7 @@
 uniform float gain;
 uniform vec3 seed;
 uniform float phase;
+uniform float radius;
 uniform float scale;
 
 uniform float lacunarity;
@@ -141,8 +142,8 @@ void main() {
     float _gain = gain;
     float shift = 100.0;
 
-    vec3 xseed = vec3(seed.xy, seed.z+cos(phase*3.1415926535));
-    vec3 yseed = vec3(seed.yx, seed.z+sin(phase*3.1415926535));
+    vec3 xseed = vec3(seed.xy, seed.z+radius*cos(phase*3.1415926535));
+    vec3 yseed = vec3(seed.yx, seed.z+radius*sin(phase*3.1415926535));
 
     vec3 uv = vec3(v_texCoord0 + offset, 1.0) * 2.0 - 1.0;
     vec3 px = ((segment(uv, xSegments, ySegments) + xseed) * scale);