200412

let renderer;

const CYCLE = 180;

let sh;

​

​

function setup() {

  renderer = createCanvas(windowWidth, windowHeight,WEBGL);

  //shader

  sh = createShader(vert,frag);

  this.shader(sh);

  sh.setUniform("u_resolution", [width,height]);

  sh.setUniform("u_lightDir", [-1,-0.1,0]);

  noStroke();

  pixelDensity(2);

}

​

function draw() {

  background(240);

  setCol(sh,'#FFFFFF','#111111');

  rotateX(frameCount/CYCLE/2*TWO_PI);

  rotateY(frameCount/CYCLE/2*TWO_PI);

  rotateZ(frameCount/CYCLE/3*TWO_PI);

  noisedSphere(min(width,height)*0.25,50,50);

}

​

​

​

function noisedSphere(_sphereRadius,dx,dy)

{

  let geometry = new p5.Geometry(dx,dy);

  let noiseAmount = map(sin(frameCount/30),-0.99,-0.2,0,-0.5,true) ;

  for(let yi = 0; yi <= dy; yi ++)

  {

    let yRadian = map(yi,0,dy,PI/2,-PI/2);

    let y = sin(yRadian)*_sphereRadius;

    let radius = cos(yRadian)*_sphereRadius;

    for(let xi = 0; xi <= dx; xi++)

    {

      let r = xi* TWO_PI/dx ;

      let x = cos(r)*radius;

      let z = sin(r)*radius;

      if(yi == 0 || yi == dy){x = 0; z =0;}

      let nv = (noise(x/radius,y+frameCount/30,z/radius));

      nv = map(nv,0,1,1,1+ noiseAmount);

      geometry.vertices[xi + (dx+1)*yi] = createVector(x*nv,y*nv,z*nv);

    }

  }

  //face

  geometry.computeFaces();

  for(let i=geometry.faces.length-1; i>=0; i-- ){

    if(i < dx*2 && i %2 == 0 || i > geometry.faces.length-dx*2 && i %2 == 1)geometry.faces[i] = [];

  }

  for(let i=geometry.faces.length-1; i>=0; i-- ){

    if(geometry.faces[i].length == 0)geometry.faces.splice(i,1);

  }

  //normal

  geometry.computeNormals();

  geometry.averageNormals();  

  //draw

  drawGeometry(geometry);

}

​

function drawGeometry(_geo,_id = 'gId',_renderer = renderer)

{

  _renderer.createBuffers(_id, _geo);

  _renderer.drawBuffers(_id);

}

​

​

function setCol(shader,colStr,shadowColStr)

{

  let col = color(colStr);

  let colArray = col._array;

  colArray.pop();

  shader.setUniform("u_col",colArray);

  let shadowCol = color(shadowColStr);

  let shadowColArray = shadowCol._array;

  shadowColArray.pop();

  shader.setUniform("u_Scol",shadowColArray);

}

​

​

​