From 8296c5e867a7029a7f309e022fa1a5309382fad6 Mon Sep 17 00:00:00 2001
From: tessaK9 <chaos@tessa.dog>
Date: Fri, 13 Mar 2026 13:14:25 +0100
Subject: [PATCH] added modifier to partial extrusion to slightly change rake,
 slight changes to cat/dogears

---
 bezier_extrusion.scad |  6 +++---
 catears.scad          | 17 +++++++++--------
 dogears.scad          |  2 +-
 headband.scad         | 26 +++++++++++++-------------
 4 files changed, 26 insertions(+), 25 deletions(-)

diff --git a/bezier_extrusion.scad b/bezier_extrusion.scad
index dd65f21..9c125e6 100644
--- a/bezier_extrusion.scad
+++ b/bezier_extrusion.scad
@@ -15,7 +15,7 @@ module slice(points){
   polyhedron(points = points_new, faces = faces, convexity = 10);
 }
 
-module bezier_extrude_partial(ctrl, shape, gap = 1, mod = function (t) 1, mod_x = function(t) 1, mod_y = function (t) 1, sections = 128){
+module bezier_extrude_partial(ctrl, shape, merlon = 1, gap = 1,  mod = function (t) 1, mod_x = function(t) 1, mod_y = function (t) 1, sections = 128){
   B_0 = ctrl[0];
   B_1 = 3*(-ctrl[0] + ctrl[1]);
   B_2 = 3*(ctrl[0] - 2*ctrl[1] + ctrl[2]);
@@ -30,8 +30,8 @@ module bezier_extrude_partial(ctrl, shape, gap = 1, mod = function (t) 1, mod_x
   slices = [for (i = [0 : sections]) 
             let (t = i/sections, p = bezier(t), normal = normal(t), n = normal/norm(normal))  
            [for (v = shape) [p.x+(mod(t) * mod_x(t) * n.x * v.x),p.y+(mod(t) * mod_x(t) * n.y * v.x), mod(t) * mod_y(t) * v.y]]];
-  for(i = [0 : 1+gap : sections-1]){
-      slice([slices[i],slices[i+1]]);
+  for(i = [0 : 1+gap : sections-merlon]){
+      slice([slices[i],slices[i+merlon]]);
   }
 }
 
diff --git a/catears.scad b/catears.scad
index 5b491e1..ef6fa22 100644
--- a/catears.scad
+++ b/catears.scad
@@ -3,19 +3,20 @@ use <headband.scad>;
 
 thickness = 2.7;
 height = 5.5;
+epsilon = 0.001;
 
 module catear(){
 
   ctrl_ear1 = [[49,96],[58,112],[63,137],[61.5,141]];
-  ctrl_ear2 = [[61.5,141],[60,145],[42.5,140.5],[18,123]];
+  ctrl_ear2 = [[61.5+1.5*epsilon,141-4*epsilon],[60,145],[42.5,140.5],[18,123]];
 
-  shape_band = [[thickness/2,height/2-0.5],
-                [thickness/2,-height/2+0.5],
-                [thickness/2-0.5,-height/2],
-                [-thickness/2+0.5,-height/2],
-                [-thickness/2,-height/2+0.5],
-                [-thickness/2,height/2-0.5],
-                [-thickness/2+0.5,height/2],
+  shape_band = [[thickness/2,height/2-0.25],
+                [thickness/2,-height/2+0.25],
+                [thickness/2-0.25,-height/2],
+                [-thickness/2+0.25,-height/2],
+                [-thickness/2,-height/2+0.25],
+                [-thickness/2,height/2-0.25],
+                [-thickness/2+0.25,height/2],
                 [thickness/2-0.5,height/2]];
     
   bezier_extrude(ctrl = ctrl_ear1, shape = shape_band, sections = 32);
diff --git a/dogears.scad b/dogears.scad
index 05d9064..4a4f41b 100644
--- a/dogears.scad
+++ b/dogears.scad
@@ -21,4 +21,4 @@ module dogears(rightear = "flop", leftear = "flop"){
   }
 }
 
-dogears();
\ No newline at end of file
+dogears(rightear = "lflop");
\ No newline at end of file
diff --git a/headband.scad b/headband.scad
index fb5d236..840e319 100644
--- a/headband.scad
+++ b/headband.scad
@@ -3,26 +3,26 @@ use <bezier_extrusion.scad>;
 module headband(thickness, height){
   rake_length = 3;
 
-  shape_band = [[thickness/2,height/2-0.5],
-                [thickness/2,-height/2+0.5],
-                [thickness/2-0.5,-height/2],
-                [-thickness/2+0.5,-height/2],
-                [-thickness/2,-height/2+0.5],
-                [-thickness/2,height/2-0.5],
-                [-thickness/2+0.5,height/2],
-                [thickness/2-0.5,height/2]];
+  shape_band = [[thickness/2,height/2-0.25],
+                [thickness/2,-height/2+0.25],
+                [thickness/2-0.25,-height/2],
+                [-thickness/2+0.25,-height/2],
+                [-thickness/2,-height/2+0.25],
+                [-thickness/2,height/2-0.25],
+                [-thickness/2+0.25,height/2],
+                [thickness/2-0.25,height/2]];
          
   shape_rake = [[0,-height/2],
                 [0,height/2],
                 [rake_length,height/2-2],
                 [rake_length,-height/2+2]];
     
-  shape_halfband = [[thickness/2,height/2-0.5],
-                    [thickness/2,-height/2+0.5],
-                    [thickness/2-0.5,-height/2],
+  shape_halfband = [[thickness/2,height/2-0.25],
+                    [thickness/2,-height/2+0.25],
+                    [thickness/2-0.25,-height/2],
                     [0,-height/2],
                     [0,height/2],
-                    [thickness/2-0.5,height/2]];
+                    [thickness/2-0.25,height/2]];
          
   ctrl_band = [[21,0],[77,56],[56,126],[0,126]];
   ctrl_end = [[21,0],[20,-1],[18,-4],[17,-8]];
@@ -39,7 +39,7 @@ module headband(thickness, height){
     translate([-17,-8]){
       rotate_extrude(convexity = 10, $fn = 16) polygon(shape_halfband);
     }
-    bezier_extrude_partial(ctrl = ctrl_rake, shape = shape_rake, gap = 2, sections = 3*64+1);
+    bezier_extrude_partial(ctrl = ctrl_rake, shape = shape_rake, merlon = 2, gap = 3, sections = 5*42+1 );
   }
 }