meshstatic/index.html at master · elenzil/meshstatic · GitHub

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<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml" xmlns:fb="http://ogp.me/ns/fb#">
  <head>
    <meta charset="utf-8"/>
    <meta name="viewport" content="width=device-width, user-scalable=no, minimum-scale=1.0, maximum-scale=1.0">
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    -->
    <title>mesh static</title>
    <link rel="icon" href="images/thing_100.png" />
    <meta property="og:image" content="images/thing_100.png" />
    <meta name="twitter:image" content="images/thing_100.png" />


    <script src="3js/three.min.js"></script>
    <script src="3js/OrbitControls.js"></script>
    <script src="3js/STLLoader.js"></script>

    <script>

      var gScene, gCamera, gRenderer, gControls;
      var gParticles, gMesh, gParts2, gWires;

      var gStyle = 1;

      var gShowMesh  = true;
      var gShowParts = true;

      var gWidth  = 600;
      var gHeight = 600;

      var gNumPoints = 1000;

      var gPointSize = 0.05;

      var gCamHome;


      function gebid(id) {
        return document.getElementById(id);
      }

      function onLoad() {
        init();
        animate();
        initHTML();
      }

      function init() {
        gScene  = new THREE.Scene();

        gRenderer = new THREE.WebGLRenderer({antialias:true});
        gRenderer.setSize(gWidth, gHeight);
        gebid('webgl_container').appendChild(gRenderer.domElement);

        gCamHome = new THREE.Vector3(0, 0, 5);
        gCamera  = new THREE.PerspectiveCamera(45, gWidth / gHeight, 0.1, 100);
        gScene.add(gCamera);
        home();

        var light = new THREE.DirectionalLight(0x555522);
        light.position.set(0, 1, .5);
        gScene.add(light);

        var light = new THREE.DirectionalLight(0x225555);
        light.position.set(0, 0, -1);
        gScene.add(light);

        var light = new THREE.DirectionalLight(0x552255);
        light.position.set(-1, 0, .5);
        gScene.add(light);

        loadGeometry("models/sphere_100.stl");

        stubPoints();

        gControls = new THREE.OrbitControls(gCamera, gRenderer.domElement);
        // gControls.enableDamping = true;
        // gControls.dampingFactor = 0.25;

        // var fog = new THREE.Fog(0x0, 4, 4.5);
        // gScene.fog = fog;
      }

      function stubPoints() {
        if (gParts2 !== undefined) {
          gScene.remove(gParts2);
        }

        gParticles = new THREE.Geometry();

        gParticles.vertices = [];
        for (var n = 0; n < gNumPoints; ++n) {
          var particle = new THREE.Vector3(0, 0, 0);
          gParticles.vertices.push(particle);
        }

        var pMaterial = new THREE.PointsMaterial({
          color: 0xFFFFFF,
          opacity: 0.5,
          size: gPointSize,
          map: new THREE.TextureLoader().load(
            "images/dot_128.png"
          ),
          blending: THREE.AdditiveBlending,
          transparent: true,
          depthWrite: false
//          depthTest: false
          // hm, can't get polygonOffset to work.
            // polygonOffset: true,
            // polygonOffsetFactor: -20,
            // polygonOffsetUnits: -20
        });

        gParts2 = new THREE.Points(gParticles, pMaterial);

        gParts2.visible = gShowParts;
        gScene.add(gParts2);

      }

      function animate() {
        requestAnimationFrame(animate);
        gRenderer.render(gScene, gCamera);
        gControls.update();
      }

      function initHTML() {
        gebid("iNumPts").value = gNumPoints;
        gebid("iPtSize").value = gPointSize;
      }

      function grabHTML() {
        gNumPoints = gebid("iNumPts").value * 1;
        gPointSize = gebid("iPtSize").value * 1;

        if (gebid("is1").checked) {
          gStyle = 1;
        }
        else if (gebid("is2").checked) {
          gStyle = 2;
        }
        else {
          console.error("no style selected");
          gStyle = 1;
        }

      }

      function loadGeometry(url) {
        var loader = new THREE.STLLoader();
        loader.load(url, function (geometry) {
          if (gMesh !== undefined) {
            gScene.remove(gMesh);
            gScene.remove(gWires);
          }
          var material = new THREE.MeshLambertMaterial({
            polygonOffset: true,
            polygonOffsetFactor: 10, // positive value pushes polygon further away
            polygonOffsetUnits: 10
          });
          gMesh = new THREE.Mesh(geometry, material);
          gMesh.visible = gShowMesh;
          gScene.add(gMesh);

          var gLines = new THREE.WireframeGeometry(geometry);
          var mat = new THREE.LineBasicMaterial({
            color: 0x0,
            linewidth: 1,
            transparent: true,
            opacity: 0.1,
          });
          gWires = new THREE.LineSegments( gLines, mat );
          gMesh.add(gWires);

          thinkTriangles(geometry);
          doIt();
        });
      }

      function dist(ptA, ptB) {
        var dx = ptB.x - ptA.x;
        var dy = ptB.y - ptA.y;
        var dz = ptB.z - ptA.z;
        return Math.sqrt((dx * dx) + (dy * dy) + (dz * dz));
      }

      var gCumulativeProbabilities;
      var gUpness;
      var gAreas;
      var gTriangles;

      function thinkTriangles(geometry) {
        gTriangles = geometry;

        gAreas                   = [];
        gUpness                  = [];
        gCumulativeProbabilities = [];

        var verts = geometry.vertices;

        var num = geometry.faces.length;
        for (var n = 0; n < num; ++n) {
          var face = geometry.faces[n];
          // heron's formula for area
          var ab = dist(verts[face.a], verts[face.b]);
          var bc = dist(verts[face.b], verts[face.c]);
          var ca = dist(verts[face.c], verts[face.a]);
          var s = (ab + bc + ca) / 2;
          var A = Math.sqrt(s * (s - ab) * (s - bc) * (s - ca));
          var Up = upness(verts[face.a], verts[face.b], verts[face.c]);
          gAreas [n] = A;
          gUpness[n] = Up;
        }
      }

      var gvUp = new THREE.Vector3(0, 1, 0);
      function upness(pA, pB, pC) {
        var vAB = pB.clone().sub(pA);
        var vAC = pC.clone().sub(pA);

        var vCross = vAB.clone().cross(vAC);
        vCross.normalize();
        var sDot = vCross.dot(gvUp);
        var sUp  = sDot > 0 ? sDot : 0;
        return sUp;
      }

      function computeProbabilities() {
        var cp = 0;

        if (gStyle == 1) {
          for (var n = 0; n < gAreas.length; ++n) {
            cp += gAreas[n]
            gCumulativeProbabilities[n] = cp;
          }
        }
        else if (gStyle == 2) {
          for (var n = 0; n < gAreas.length; ++n) {
            cp += gAreas[n] * gUpness[n];
            gCumulativeProbabilities[n] = cp;
          }
        }
        else {
          console.error("wtf1");
        }
      }

      function chooseTriangle() {
        var totalArea = gCumulativeProbabilities[gCumulativeProbabilities.length - 1];
        var r = Math.random() * totalArea;
        var chosen = gCumulativeProbabilities.length - 1;
        for (var n = 0; n <= chosen; ++n) {
          if (gCumulativeProbabilities[n] > r) {
            chosen = n;
            break;
          }
        }

        return chosen;
      }

      function choosePoint(ptA, ptB, ptC) {
        // normalized distance along basis vectors.
        var nAB = Math.random();
        var nAC = Math.random();

        // if the normalized coordinates are outside the triangle (0, 0), (1, 0), (0, 1),
        // then the point will be outside our real triangle,
        // so reflect it back inside the region.
        if ((nAB + nAC) > 1) {
          nAB = 1 - nAB;
          nAC = 1 - nAC;
        }

        // vAB and vAC form a basis vector for the space.
        var vAB = ptB.clone().sub(ptA);
        var vAC = ptC.clone().sub(ptA);

        vAB.multiplyScalar(nAB);
        vAC.multiplyScalar(nAC);

        var ret = ptA.clone();

        ret.add(vAB);
        ret.add(vAC);

        return ret;
      }

      function doIt() {

        var stubIt = false;

        stubIt = stubIt || (gNumPoints != gParticles.vertices.length);
        stubIt = stubIt || (Math.abs(gPointSize - gParts2.material.size) > 0.001);

        if (stubIt) {
          stubPoints();
        }

        computeProbabilities();

        var verts = gTriangles.vertices;

        for (n = 0; n < gNumPoints; ++n) {
          var triIndex = chooseTriangle();

          var face = gTriangles.faces[triIndex];

          gParticles.vertices[n] = choosePoint(verts[face.a], verts[face.b], verts[face.c]);
        }

        gParticles.verticesNeedUpdate = true;
      }

      function onClickNew() {
        grabHTML();
        doIt();
      }

      function onClickShowModel(checkbox) {
        gShowMesh = checkbox.checked;
        gMesh.visible = gShowMesh;

      }

      function onClickShowPoints(checkbox) {
        gShowParts = checkbox.checked;
        gParts2.visible = gShowParts;
      }

      function onClickDump() {

        var verts = gParticles.vertices;

        var delim = "";

        var s = "";
        s += "[\n";
        for (var n = 0; n < verts.length; ++n) {
          s += delim;
          s += "  [";
          s += verts[n].x.toFixed(4);
          s += ", ";
          s += verts[n].y.toFixed(4);
          s += ", ";
          s += verts[n].z.toFixed(4);
          s += "]";

          delim = ",\n";
        }
        s += "\n]\n";

        gebid("pointDump").innerHTML = s;
      }

      function home() {
        gCamera.position.set(gCamHome.x, gCamHome.y, gCamHome.z);
      }

    </script>
  </head>
  <style>
    body {
      font-family: Courier New, monospace;
      background-color: DarkSlateGray;
      color:MistyRose;
    }
    canvas {
      border: 1px solid #bbb;
    }

    #webgl_container {
      display:inline-block;
    }

    .geoBtn {
      width:100px;
    }

    .blahblah {
      font-size: small;
    }

    #regen {
      background-color:limegreen;
    }

    #pointDump {
      border:1px dashed gray;
    }

    .radItem {
//    border:1px dashed grey;
      display:inline-block;
      padding:3px;
    }


  </style>

  <body onload="onLoad()">
    <p class="blahblah">
      an experiment around distributing points randomly on the surface of a (triangle) mesh.
    </p>
    <table>
      <tr valign="top">
        <td>
          <div id="webgl_container" width=600px height=600px></div>
        </td>
        <td>
          <button class="geoBtn" onClick="loadGeometry('models/triangle.stl')">triangle</button>
          <button class="geoBtn" onClick="loadGeometry('models/box_100.stl')">cube</button>
          <button class="geoBtn" onClick="loadGeometry('models/sphere_100.stl')">sphere</button>
          <button class="geoBtn" onClick="loadGeometry('models/reef_110.stl')">manifold1</button>
          <button class="geoBtn" onClick="loadGeometry('models/reef_100.stl')">manifold2</button>
          <button class="geoBtn" onClick="loadGeometry('models/donut_100.stl')">donut</button>
          <hr/>
          <button class="geoBtn" onClick="home()">home</button>
          <hr/>
          <table width='100%'>

            <tr>
              <td>
                Model:
                <input type='checkbox' onClick="onClickShowModel(this)" checked="checked"/>
              </td>
              <td>
                Points:
                <input type='checkbox' onClick="onClickShowPoints(this)" checked="checked"/>
              </td>
            </tr>
            <tr>
              <td>
                Num Points:
                <input id="iNumPts" width="50px"/>
              </td>
              <td>
                Point Size:
                <input id="iPtSize" width="50px"/>
              </td>
            </tr>

          </td>
        </td>
      </tr></table><hr/>
          <button id="regen" onClick="onClickNew()">regenerate points</button>
          <br>
          <div class="radItem"><input type="radio" id="is1" name="style" checked>everywhere</div>
          <div class="radItem"><input type="radio" id="is2" name="style" >upward sides</div>
          <!--<div class="radItem"><input type="radio" name="style" value="rain">rain</div>-->
          <hr/>
          <button  onClick="onClickDump()">dump points as json</button>
          <pre id="pointDump"> </pre>
  </body>
</html>