idcrook · July 1, 2020 18:29 · Jul 1, 2020 · Jul 1, 2020 · Jul 1, 2020
diff --git a/app_icon_model.scad b/app_icon_model.scad
@@ -1,6 +1,9 @@
 // Reverse-engineer model an Xcode 12 Instruments icon mesh in OpenSCAD
 // [email protected]
 
+// Inspired to create by
+// https://twitter.com/edwardsanchez/status/1278152030645698560
+
 // Turn on Animate in App menu bar
 //  [x] Check Dump Pictures
 //      - creates files in sequence frame00000.png

diff --git a/z_app_icon_model_25pct.png b/z_app_icon_model_25pct.png
diff --git a/zz_animated_25pct.gif b/zz_animated_25pct.gif
diff --git a/app_icon_model.scad b/app_icon_model.scad
@@ -0,0 +1,75 @@
+// Reverse-engineer model an Xcode 12 Instruments icon mesh in OpenSCAD
+// [email protected]
+
+// Turn on Animate in App menu bar
+//  [x] Check Dump Pictures
+//      - creates files in sequence frame00000.png
+//  -   Select FPS: 12 and Steps: 60
+//
+//  Time ($t) sweeps from 0.0 to 1.0
+
+size = 100;
+
+// https://openscadsnippetpad.blogspot.com/2017/06/figure-eight-path.html
+
+function figure8(m=size)=[for(t=[0:1:360])
+let(scale = 2 / (3 - cos(2*t)),x =m* scale * cos(t),y =m* scale * sin(2*t) / 2)
+[x,y]];
+
+function close(p)= concat(p,[p[0]]);
+
+module polyline(p) {for(i=[0:max(0,len(p)-2)])line(p[i],p[i+1]);}
+module line(p1, p2, width=(size/7)/2.0)
+{
+    hull() {
+        translate(p1) sphere(width);
+        translate(p2) sphere(width);
+    }
+}
+
+module one_symbol() {
+       polyline(close(figure8(size/2)));
+}
+
+module assembly2 () {
+    x_off = 16.5;
+    z_off = 23;
+
+    translate([-x_off,0,0])
+        //rotate([45/2 , 90 + 30, 45/2])
+        rotate([0 , 90 + 30, 0])
+        rotate([0 , 0, -15])
+        one_symbol();
+
+    translate([x_off,0,0])
+        rotate([0, -(90 + 30), 0])
+        rotate([0 , 0, -15])
+        one_symbol();
+
+    translate([0,0,-z_off])
+        rotate([0 , 0, -15])
+        rotate([0 , 0, 0])
+        one_symbol();
+}
+
+show_assembly = true;
+
+// $preview requires version 2019.05
+fn = $preview ? 30 : 100;
+
+// can only _assign_ viewpoint variables at top-level
+$vpt = [0,0,0];
+$vpr = [90, 0, $t * 360]; // rotate viewpoint
+$vpd = 415;
+
+if (show_assembly) {
+    scale ([1.0,1.0,1.0])
+        translate([0,0,0])
+        rotate([0,0,0])
+        assembly2();
+} else {
+    scale ([1.0,1.0,1.0])
+        translate([0,0,0])
+        rotate([0,0,0])
+        one_symbol();
+}
diff --git a/convert_to_gif.sh b/convert_to_gif.sh
@@ -0,0 +1,7 @@
+#!/bin/bash -x
+
+# ImageMagick has these utilities
+
+convert 'frame000*.png' -set delay 1x24 animated.gif
+
+convert animated.gif -scale 25% animated_25pct.gif