Hi community!

Picture:

**Demo + source code: https://codepen.io/prisoner849/full/RwjQaeO**

The brain in the scene consists of seveal components:

- Fat lines. Based on CatmullRomCurve3. Instead of changing parts of
`LineMaterial`

with`.replace()`

, I took the source code of material shaders awhole and changed the parts I needed. Magenta flows. - Icosahedron. That blue-ish mesh of wireframe.
- Lines. Yellow signals.

First version of the brain was ugly, as I just used `ImprovedNoise`

on a sphere with some scaling on axes.

So, I had to rewrite the function of deforming to make something, that looks more or less like a human brain.

If you’re intersted in function of deform, it’s here: JSFiddle (costed me a couple of morning hours )

## Brain deform

```
function deform(p){
let mainR = 4;
v3.copy(p).normalize();
let len = p.length();
let ns = perlin.noise(v3.x * 3, v3.y * 3, v3.z * 3);
ns = Math.pow(Math.abs(ns), 0.5) * 0.5;
let r = smoothstep(0.375, 0,Math.abs(v3.x)) - ns;
p.setLength(mainR - r*0.5);
p.y *= 1 - 0.5 * smoothstep(0, -mainR, p.y);
p.y *= 0.75;
p.x *= 0.75;
p.y *= 1 - 0.125 * smoothstep(mainR * 0.25, -mainR, p.z);
p.x *= 1 - 0.125 * smoothstep(mainR * 0.25, -mainR, p.z);
}
//https://github.com/gre/smoothstep/blob/aa5b60a10fd7c1c6e3a62d5efad4b086369f4232/index.js
function smoothstep (min, max, value) {
var x = Math.max(0, Math.min(1, (value-min)/(max-min)));
return x*x*(3 - 2*x);
};
```

Any component, in its base, is a set of points in a sphere with radius of 1. So vertices of each somponent are deformed with the same function, to match them one to each other.