diff --git a/.gitignore b/.gitignore
index 3ef2023..b6661dd 100644
--- a/.gitignore
+++ b/.gitignore
@@ -26,4 +26,5 @@ confdeps.*
 conftest.*
 forge_saved_state.txt
 *.py
-error.glsl
\ No newline at end of file
+error.glsl
+draft/
\ No newline at end of file
diff --git a/DEVELOPMENT.md b/DEVELOPMENT.md
index f739abc..65f0904 100644
--- a/DEVELOPMENT.md
+++ b/DEVELOPMENT.md
@@ -92,8 +92,8 @@ make -f Makefile.dev release-arch
   - [ ] src 12 : ?
   - [ ] src 13 : ?
   - [ ] src 15 : debug -> calibration screen
-  - [ ] fx 11 : colorize range (pretty color ranges)
-  - [ ] fx 12 : spill
+  - [ ] fx 10 : colorize range (pretty color ranges)
+  - [x] fx 11 : spill
   - [x] frag 10 : move debug screen here
   - [ ] debug : add src/fx/A/B indicators
 - [ ] Other
diff --git a/README.md b/README.md
index 8530722..39bb13d 100644
--- a/README.md
+++ b/README.md
@@ -151,7 +151,7 @@ options:
 |       | **7** | Sentences         | _Zoom_            | _Sentence_      | _Vertical repeat_  | Kaleidoscope     | _Axes_          | _Rotation_    | _Horz. Scroll_ |
 |       | **8** |                   |                   |                 |                    | CP437            | _Zoom_          | _Charset_     | _Char. Delta_  |
 |       | **9** |                   |                   |                 |                    | Lens             | _Lens limit_    | _Lens power_  | _Pre Zoom_     |
-| **3** | **A** | Video In 2 + Thru | _Hue_             | _Saturation_    | _Light_            |                  |                 |               |                |
+| **3** | **A** | Video In 2 + Thru | _Hue_             | _Saturation_    | _Light_            | Spill                 | _Bottom limit_                | _Top Limit_              | _Rotation_               |
 |       | **B** |                   |                   |                 |                    |                  |                 |               |                |
 |       | **C** |                   |                   |                 |                    |                  |                 |               |                |
 |       | **D** |                   |                   |                 |                    |                  |                 |               |                |
diff --git a/default/inc_fx.glsl b/default/inc_fx.glsl
index 57120a7..64c8fec 100644
--- a/default/inc_fx.glsl
+++ b/default/inc_fx.glsl
@@ -315,10 +315,9 @@ subroutine(fx_stage_sub) vec4 fx_10(vec2 vUV, sampler2D previous, sampler2D feed
     return fx_master(c0, c, seed, m0);
 }
 
-// TODO FX 11
+// FX 11 : spill
 subroutine(fx_stage_sub) vec4 fx_11(vec2 vUV, sampler2D previous, sampler2D feedback, int seed, vec3 b1, vec2 f1, vec3 b2, vec2 f2, vec3 b3, vec2 f3, vec3 m0)
 {
-    return fx_1(vUV, previous, feedback, seed, b1, f1, b2, f2, b3, f3, m0);
     // start
 
 	vec2 uv0 = vUV.st;
@@ -327,10 +326,20 @@ subroutine(fx_stage_sub) vec4 fx_11(vec2 vUV, sampler2D previous, sampler2D feed
 
     // controls
 
+    float wall1 = magic(f1, b1, seed + 10);
+    float wall2 = magic(f2, b2, seed + 20);
+    float angle = magic(f3, b3, seed + 30);
+
     // logic
     
     vec3 c0 = texture(previous, uv0).xyz;
-    vec3 c = c0;
+
+    vec2 uv2 = uv1;
+    uv2 *= rot(angle);
+    uv2.y = min(uv2.y, 1 - wall1);
+    uv2.y = -min(-uv2.y, 1 - wall2);
+    uv2 *= rot(-angle);
+    vec3 c = reframe(previous, uv2).xyz;
 
     return fx_master(c0, c, seed, m0);
 }