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HTML 

              
                
<!doctype html>
<html>
  <head>
    <title>Steeple dat.GUI adjustment final</title>
    <style>
      body { max-width: 100%; }
      /* feel free to style the canvas any way you want. If you want it to
      use the entire window, set width: 100% and height: 100%. */
      
      canvas {
          width: 80%;
          height: 500px;
          display: block;
          margin: 10px auto;
      }
    </style>
  </head>
<body>

  <h1>Steeple dat.GUI adjustment final</h1>
  
  <p>Example solution for the steeple adjustment via dat.GUI controls exercise.</p>

</body>
</html>
!

CSS
!

JS 

              
                /* Returns a geometry object for a steeple, which is just a square pyramid
 * or tetrahedron.  The origin is in the center of the base, so the base
 * vertices are at y=0 and x and z at plus or minus half the width, and
 * the top is at (0,height,0) */

function createSteeple(width, height) {
    var geom = new THREE.Geometry();
    var w2 = 0.5*width;
    // add the base
    geom.vertices.push(new THREE.Vector3(+w2, 0, +w2));
    geom.vertices.push(new THREE.Vector3(+w2, 0, -w2));
    geom.vertices.push(new THREE.Vector3(-w2, 0, -w2));
    geom.vertices.push(new THREE.Vector3(-w2, 0, +w2));
    geom.vertices.push(new THREE.Vector3(0, height, 0));

    // now that we've got the vertices we need to define the faces.
    // base
    geom.faces.push(new THREE.Face3(0, 1, 2));
    geom.faces.push(new THREE.Face3(0, 2, 3));

    // side faces
    geom.faces.push(new THREE.Face3(0, 1, 4));
    geom.faces.push(new THREE.Face3(1, 2, 4));
    geom.faces.push(new THREE.Face3(2, 3, 4));
    geom.faces.push(new THREE.Face3(3, 0, 4));

    // calculate the normals for shading
    geom.computeFaceNormals();
    geom.computeVertexNormals(true);

    return geom;
}



// We always need a scene.
var scene = new THREE.Scene();

// ====================================================================

var barnWidth = 50;
var barnHeight = 30;
var barnDepth = 40;

var barn1geom = TW.createBarn( barnWidth, barnHeight, barnDepth );
var barn1mesh = TW.createMesh(barn1geom);
scene.add(barn1mesh);

// ================================================================

var steepleHeight = 36;
var steepleWidth = 6;
var sceneParams = {steepleHeight: steepleHeight};
var steepleMesh;

function placeSteeple(steepleHeight,steepleWidth) {
    var half = steepleWidth * 0.5;
    var steepleGeom = createSteeple(steepleWidth,steepleHeight);
    steepleMesh = TW.createMesh(steepleGeom);
    steepleMesh.position.set(barnWidth*0.5,
                             barnHeight+barnWidth*0.5-half,
                             -half);
    scene.add(steepleMesh);
}

placeSteeple(steepleHeight, steepleWidth);

// ================================================================

var renderer = new THREE.WebGLRenderer();

TW.mainInit(renderer, scene);

TW.cameraSetup(renderer,
               scene,
               {minx: 0, maxx: barnWidth,
                miny: 0, maxy: barnHeight + barnWidth*0.5+steepleHeight-steepleWidth*0.5,
                minz: -barnDepth, maxz: 0});

function redrawSteeple() {
    scene.remove(steepleMesh);
    steepleHeight++;
    placeSteeple(sceneParams.steepleHeight,steepleWidth);
    TW.render();
}

var gui = new dat.GUI();

gui.add(sceneParams,'steepleHeight',20,40).onChange(redrawSteeple);
!
999px

Console