Yet another spiral transitioning between two parametric functions. &#39;Bloody Brexit&#39; ink from Diamine with brush pens on A4 Bristol.
<img width="100%" src="/images/plots/131.gif" />

Yet another spiral transitioning between two parametric functions. 'Bloody Brexit' ink from Diamine with brush pens on A4 Bristol.

hexa flower noise

Exploring a spiral transitioning between two parametric functions to create an hexagonal fold effect. Addition of perlin noise to offset a bit two similar spirals. Fountain pen on A4 Bristol.
<img width="100%" src="/images/plots/130_zoom.jpg"/>

Exploring a spiral transitioning between two parametric functions to create an hexagonal fold effect. Addition of perlin noise to offset a bit two similar spirals. Fountain pen on A4 Bristol.

hexafold planet

Here is &quot;Jumping blob&quot; my second <a href="https://greweb.me/2021/05/plot-loops">&quot;plot loop&quot; (see article)</a>. The main digital art is a 1920p video loop of 8 frames available as a <a href="https://www.hicetnunc.xyz/objkt/71006">Tezos hicetnunc NFT</a>. The physical art is 8 frames of A5 size, the square of the drawing is 12cm by 12cm and they are offered when <a href="https://www.hicetnunc.xyz/objkt/71006">buying the NFT</a> (8 editions, assigned in buy order).
There are 8 frames plotted recreating the &quot;jumping blob&quot; animation (shader implemented in <a href="https://greweb.me/shaderday/67">https://greweb.me/shaderday/67</a>). Each frame is plotted with two fountain pens (Diamine inks: Pink and Turquoise) on Canson Bristal (A5 format), and takes about an hour to plot.
<img width="100%" src="/images/plots/129_all.jpg" />

Each frame revisit a specific technique that I explored in the past months:
<ul>
<li>Frame 1: Voronoi distribution + samples spiral</li>
<li>Frame 2: Voronoi distribution + samples sorted</li>
<li>Frame 3: Voronoi polygons</li>
<li>Frame 4: Voronoi distribtion + TSP</li>
<li>Frame 5: sampling points and starting lines with vector field (low frequency)</li>
<li>Frame 6: sampling points and starting lines with vector field (aligned horizontally)</li>
<li>Frame 7: sampling points and starting lines with vector field (more curvy)</li>
<li>Frame 8: circles plotting</li>
</ul>
<img width="50%" src="/images/plots/129_zoom1.jpg" /><img width="50%" src="/images/plots/129_zoom2.jpg" />
The generator was completely reimplemented, including the &quot;scene&quot; itself which is a port of the GLSL code into Rustlang with some adjustments (two different colors are spread on different areas):
<pre><code class="language-rust">fn jumping_blob(f: f64, o: (f64, f64)) -&gt; Vec&lt;f64&gt; {
 let mut p = o;
 let bezier = Bezier::new(0.0, 0.1, 1.0, 0.9);
 let x = bezier.calculate(f as f32) as f64;
 let t = x * 2. * PI;
 let radius = 0.18;
 let smoothing = 0.15;
 let dist = 0.2;
 p.0 -= 0.5;
 p.1 -= 0.5;
 p.1 *= -1.0;
 p = p_r(p, PI / 2.0);
 let q = p;
 p = p_r(p, -t);
 let s = f_op_difference_round(
 f_op_union_round(
 q.0.max(0.1 + q.0),
 length((p.0 + dist, p.1)) - radius,
 smoothing,
 ),
 length((p.0 - dist, p.1)) - radius,
 smoothing,
 );
 let v = smoothstep(-0.6, 0.0, s).powf(2.0)
 * (if s &lt; 0.0 { 1.0 } else { 0.0 });
 vec![
 v * (0.001 + smoothstep(-0.5, 1.5, p.0)),
 v * (0.001 + smoothstep(1.5, -0.5, p.0)),
 ]
}
fn p_r(p: (f64, f64), a: f64) -&gt; (f64, f64) {
 (
 a.cos() * p.0 + a.sin() * p.1,
 a.cos() * p.1 - a.sin() * p.0,
 )
}
fn length(l: (f64, f64)) -&gt; f64 {
 (l.0 * l.0 + l.1 * l.1).sqrt()
}
fn f_op_union_round(a: f64, b: f64, r: f64) -&gt; f64 {
 r.max(a.min(b))
 - length(((r - a).max(0.), (r - b).max(0.)))
}
fn f_op_intersection_round(a: f64, b: f64, r: f64) -&gt; f64 {
 (-r).min(a.max(b))
 + length(((r + a).max(0.), (r + b).max(0.)))
}
fn f_op_difference_round(a: f64, b: f64, r: f64) -&gt; f64 {
 f_op_intersection_round(a, -b, r)
}
</code></pre>
<img width="100%" src="/images/plots/129_zoom3.jpg" />

It&#39;s one of the first time I try to work on the &quot;scene composition&quot; and I&#39;ve also used a pattern filled with &quot;+&quot; for the background. I want to explore more of these in the future.

8 frames plotted making an animated loop of a jumping blob. A 1920p video and 12cm square physical art is available as an NFT.