Improved version of attempt at reverse engineering Xcode 12 Instruments icon, modeled in OpenSCAD

app_icon_model.scad

// 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
//  -   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();
}

convert_to_gif.sh

#!/bin/bash -x

# ImageMagick has these utilities

convert 'frame000*.png' -set delay 1x24 animated.gif

convert animated.gif -scale 25% animated_25pct.gif

z_app_icon_model_25pct.png

zz_animated_25pct.gif