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HTML

              
                
<!doctype html>
<html>
  <head>
    <title>Triangle interpolation</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: 400px;
          display: block;
          margin: 10px auto;
      }
    </style>
  </head>
<body>

  <h1>Triangle interpolation</h1>
  
  <p>Demo of an RGB triangle automatically interpolated by WebGL.
</p>

</body>
</html>

              
            
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CSS

              
                
              
            
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JS

              
                var scene = new THREE.Scene();

// construct geometry for a triangle with three different vertex colors
var vertexA = new THREE.Vector3(0, 0, 0);
var colorA = new THREE.Color( THREE.ColorKeywords.red );

var vertexB = new THREE.Vector3(1, 0, 0);
var colorB = new THREE.Color( THREE.ColorKeywords.lime );

var vertexC = new THREE.Vector3(0.5, 1, 0);
var colorC = new THREE.Color( THREE.ColorKeywords.blue );

var triGeom = new THREE.Geometry();
triGeom.vertices = [ vertexA, vertexB, vertexC ];
triGeom.faces = [ new THREE.Face3(0, 1, 2) ];
// set of possible colors for the vertices
triGeom.vertexColors = [ colorA, colorB, colorC ];

triGeom.computeFaceNormals();
// set particular vertexColors for the individual face
TW.computeFaceColors(triGeom);

// create a material that uses the vertex colors to compute face color
var material = new THREE.MeshBasicMaterial( { vertexColors: THREE.VertexColors } );

var mesh = new THREE.Mesh( triGeom, material );

scene.add(mesh);

// ================================================================
var renderer = new THREE.WebGLRenderer();

TW.mainInit(renderer,scene);

TW.cameraSetup(renderer,
               scene,
               {minx: 0, maxx: 1,
                miny: 0, maxy: 1,
                minz: 0, maxz: 0});

TW.viewFromFront();

              
            
!
999px

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