​

let aparam;

let kparam;

let bparam;

​

let twists;

let samples;

​

// extra things

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let offset;

​

let slider1;

let slider2;

​

let test =0;

​

function setup() {

  createCanvas(500, 500,WEBGL);

  phi = (1 + sqrt(5)) / 2; // calculate golden mean

  aparam = createSlider(1,100,100);

  kparam = createSlider(1,100,10); 

  bparam = createSlider(1,100,10); 

  twists = createSlider(1,10,1);

  samples = createSlider(3,1000,10);

  offset = createSlider(0,100,0);

  slider1 = createSlider(0,200,0);

  slider2 = createSlider(0,200,0);

}

​

function draw() {

  background(220);

    rotate(mouseX);

  orbitControl();

  let t = twists.value();

  let s = samples.value();

  let a = aparam.value();

  let b = - bparam.value();

  let k = kparam.value()/100;

​

  fill(237, 34, 93);

  noStroke();

  beginShape(TRIANGLES);

  print(a);

  let helixstep = TWO_PI/s;

  for(let i = 0; i <= TWO_PI * t; i += helixstep)

  {

      a = aparam.value();  

      //fill(map(i,-TWO_PI * 2,TWO_PI*t,255,0));

      // top corner

      let x = a * exp(k*i)*cos(i);

      let y = a * exp(k*i)*sin(i);

      let z = b * i;

      let c1 = createVector(x,y,z);  

      // bottom corner

      j = i - TWO_PI;

      x = a * exp(k*j)*cos(j);

      y = a * exp(k*j)*sin(j);

      z = b * j;

      let c2 = createVector(x,y,z);

​

      // next top corner

      j = i + helixstep;

      x = a * exp(k*j)*cos(j);

      y = a * exp(k*j)*sin(j);

      z = b * j;

      let c3 = createVector(x,y,z);  

      // next bottom corner

      j = i + helixstep - TWO_PI;

      x = a * exp(k*j)*cos(j);

      y = a * exp(k*j)*sin(j);

      z = b * j;

      let c4 = createVector(x,y,z);

      // subdivision between low and high helix (n)

      let circleCenter = createVector((c1.x+c2.x)/2,(c1.y+c2.y)/2,(c1.z+c2.z)/2)

      let circleRadius = c1.dist(c2)/2;

      // subdivision between low and high helix (n + 1)

      let circleCenterNext = createVector((c3.x+c4.x)/2,(c3.y+c4.y)/2,(c3.z+c4.z)/2);

      let circleRadiusNext = c3.dist(c4)/2;

      let circleSampling = 20;

​

      let step = TWO_PI/circleSampling;

      for(h=0; h<TWO_PI;h+=TWO_PI/circleSampling)

      {      

          fill(map(i,-TWO_PI * 2,TWO_PI*t,0,255),map(h,0,TWO_PI,255,0),0);

          // 1st point 1st circle

          let cx = circleRadius*cos(h)*cos(i)+circleCenter.x;

          let cy = circleRadius*sin(h+HALF_PI)*sin(i)+circleCenter.y;

          let cz = circleRadius*sin(h)+circleCenter.z;

          let p1c1 = createVector(cx, cy, cz);

          // 2nd point 1st circle

          cx = circleRadius*cos(h+step)*cos(i)+circleCenter.x;

          cy = circleRadius*sin(h+HALF_PI+step)*sin(i)+circleCenter.y;

          cz = circleRadius*sin(h+step)+circleCenter.z;

          let p2c1 = createVector(cx, cy, cz);

          // 1st point 2nd circle

          cx = circleRadiusNext*cos(h)*cos(i+helixstep)+circleCenterNext.x;

          cy = circleRadiusNext*sin(h+HALF_PI)*sin(i+helixstep)+circleCenterNext.y;

          cz = circleRadiusNext*sin(h)+circleCenterNext.z;

          let p1c2 = createVector(cx, cy, cz);

          // 2nd point 2nd circle

          cx = circleRadiusNext*cos(h+step)*cos(i+helixstep)+circleCenterNext.x;

          cy = circleRadiusNext*sin(h+HALF_PI+step)*sin(i+helixstep)+circleCenterNext.y;

          cz = circleRadiusNext*sin(h+step)+circleCenterNext.z;

          let p2c2 = createVector(cx, cy, cz);

          // first triangle

          vertex(p1c2.x,p1c2.y,p1c2.z);

          vertex(p2c1.x,p2c1.y,p2c1.z);

          vertex(p1c1.x,p1c1.y,p1c1.z);

          // second triangle

          vertex(p2c2.x,p2c2.y,p2c2.z);

          vertex(p2c1.x,p2c1.y,p2c1.z);

          vertex(p1c2.x,p1c2.y,p1c2.z);

      }

  }

  endShape();

​

}