threejs canvasrenderer gradient background css

index.html

<script src="http://www.threejs.org/build/three.min.js"></script>

<script src="http://www.threejs.org/examples/js/renderers/Projector.js"></script>
<script src="http://www.threejs.org/examples/js/renderers/CanvasRenderer.js"></script>

<script>
  var mouseX = 0, mouseY = 0,

      windowHalfX = window.innerWidth / 2,
      windowHalfY = window.innerHeight / 2,

      SEPARATION = 200,
      AMOUNTX = 10,
      AMOUNTY = 10,

      camera, scene, renderer;

      init();
      animate();

      function init() {

        var container, separation = 100, amountX = 50, amountY = 50,
        particles, particle;

        container = document.createElement('div');
        document.body.appendChild(container);

        camera = new THREE.PerspectiveCamera( 75, window.innerWidth / window.innerHeight, 1, 10000 );
        camera.position.z = 100;

        scene = new THREE.Scene();

        renderer = new THREE.CanvasRenderer( { alpha: true }); // gradient
        renderer.setPixelRatio( window.devicePixelRatio );
        renderer.setSize( window.innerWidth, window.innerHeight );
        container.appendChild( renderer.domElement );

        // particles

        var PI2 = Math.PI * 2;
        var material = new THREE.SpriteCanvasMaterial( {

          color: 0xffffff,
          program: function ( context ) {

            context.beginPath();
            context.arc( 0, 0, 0.5, 0, PI2, true );
            context.fill();

          }

        } );

        var geometry = new THREE.Geometry();

        for ( var i = 0; i < 100; i ++ ) {

          particle = new THREE.Sprite( material );
          particle.position.x = Math.random() * 2 - 1;
          particle.position.y = Math.random() * 2 - 1;
          particle.position.z = Math.random() * 2 - 1;
          particle.position.normalize();
          particle.position.multiplyScalar( Math.random() * 10 + 450 );
          particle.scale.x = particle.scale.y = 10;
          scene.add( particle );

          geometry.vertices.push( particle.position );

        }

        // lines

        var line = new THREE.Line( geometry, new THREE.LineBasicMaterial( { color: 0xffffff, opacity: 0.5 } ) );
        scene.add( line );

        document.addEventListener( 'mousemove', onDocumentMouseMove, false );
        document.addEventListener( 'touchstart', onDocumentTouchStart, false );
        document.addEventListener( 'touchmove', onDocumentTouchMove, false );

        //

        window.addEventListener( 'resize', onWindowResize, false );

      }

      function onWindowResize() {

        windowHalfX = window.innerWidth / 2;
        windowHalfY = window.innerHeight / 2;

        camera.aspect = window.innerWidth / window.innerHeight;
        camera.updateProjectionMatrix();

        renderer.setSize( window.innerWidth, window.innerHeight );

      }

      //

      function onDocumentMouseMove(event) {

        mouseX = event.clientX - windowHalfX;
        mouseY = event.clientY - windowHalfY;

      }

      function onDocumentTouchStart( event ) {

        if ( event.touches.length > 1 ) {

          event.preventDefault();

          mouseX = event.touches[ 0 ].pageX - windowHalfX;
          mouseY = event.touches[ 0 ].pageY - windowHalfY;

        }

      }

      function onDocumentTouchMove( event ) {

        if ( event.touches.length == 1 ) {

          event.preventDefault();

          mouseX = event.touches[ 0 ].pageX - windowHalfX;
          mouseY = event.touches[ 0 ].pageY - windowHalfY;

        }

      }

      //

      function animate() {

        requestAnimationFrame( animate );

        render();

      }

      function render() {

        camera.position.x += ( mouseX - camera.position.x ) * .05;
        camera.position.y += ( - mouseY + 200 - camera.position.y ) * .05;
        camera.lookAt( scene.position );

        renderer.render( scene, camera );

      }
</script>

style.css

/* gradient fallbacks taken from csstricks.com */
body {
  background-color: red;
  
  /* SVG fallback for IE 9 (could be data URI, or could use filter) */
  background-image: url(fallback-gradient.svg);
  
  /* Safari 4, Chrome 1-9, iOS 3.2-4.3, Android 2.1-3.0 */
  background-image: -webkit-gradient(linear, left top, right top, from(red), to(#f06d06));
  
  /* Safari 5.1, iOS 5.0-6.1, Chrome 10-25, Android 4.0-4.3 */
  background-image: -webkit-linear-gradient(left, red, #f06d06);
  
  /* Firefox 3.6 - 15 */
  background-image: -moz-linear-gradient(left, red, #f06d06);
  
  /* Opera 11.1 - 12 */
  background-image: -o-linear-gradient(left, red, #f06d06);
  
  /* Opera 15+, Chrome 25+, IE 10+, Firefox 16+, Safari 6.1+, iOS 7+, Android 4.4+ */
  background-image: linear-gradient(to right, red, #f06d06);
  margin: 0px;
  overflow: hidden;
}

testing new canvasrenderer

<script src="https://cdnjs.cloudflare.com/ajax/libs/three.js/r67/three.js"></script>
<script src="https://cdn.rawgit.com/mrdoob/three.js/r69/examples/js/renderers/Projector.js"></script>
<script src="https://cdn.rawgit.com/mrdoob/three.js/r69/examples/js/renderers/CanvasRenderer.js"></script>

<script>
	var camera, scene, renderer;
  
 	var mouseX = 0,
      mouseY = 0,
      windowHalfX = window.innerWidth / 2,
      windowHalfY = window.innerHeight / 2,
      SEPARATION = 200,
      AMOUNTX = 10,
      AMOUNTY = 10;
  
  init();
  animate();

  function init() {
    
  	var container,
				separation = 100,
        amountX = 50,
        amountY = 50,
        particles,
        particle;

		container = document.createElement('div');
    document.body.appendChild(container);
    
    scene = new THREE.Scene();
    
    renderer = new THREE.CanvasRenderer({ alpha: true }); // gradient
    
    camera = new THREE.PerspectiveCamera(
  		75,
    	window.innerWidth / window.innerHeight,
    	1,
    	10000
  	);
 
    renderer.setSize( window.innerWidth, window.innerHeight );
  container.appendChild( renderer.domElement );
    
  document.addEventListener( 'mousemove', onDocumentMouseMove, false );
  document.addEventListener( 'touchstart', onDocumentTouchStart, false );
  document.addEventListener( 'touchmove', onDocumentTouchMove, false );
  window.addEventListener( 'resize', onWindowResize, false );
    
    // camera.position.x += ( mouseX - camera.position.x ) * .05;
    // camera.position.y += ( - mouseY + 200 - camera.position.y ) * .05;
    // camera.position.z = 100;
    // // camera.position.set( 100, 100, 100);
    // // camera.lookAt( scene.position );
    // scene.add( camera );
    
  camera = new THREE.PerspectiveCamera(45, window.innerWidth / window.innerHeight, 0.1, 20000);
  camera.position.set(0,6,0);
  scene.add(camera);
 
		// particles
    var PI2 = Math.PI * 2;
    var material = new THREE.SpriteCanvasMaterial( {
      
      color: 0xffffff,
      program: function ( context ) {
        context.beginPath();
        context.arc( 0, 0, 0.5, 0, PI2, true );
        context.fill();
      }
    
    });
    
    var geometry = new THREE.Geometry();
    
    for ( var i = 0; i < 100; i ++ ) {
      particle = new THREE.Sprite( material );
      particle.position.x = Math.random() * 2 - 1;
      particle.position.y = Math.random() * 2 - 1;
      particle.position.z = Math.random() * 2 - 1;
      particle.position.normalize();
      particle.position.multiplyScalar( Math.random() * 10 + 450 );
      particle.scale.x = particle.scale.y = 10;
      scene.add( particle );
      geometry.vertices.push( particle.position );
    }

    // lines
    var line = new THREE.Line( geometry, new THREE.LineBasicMaterial( { color: 0xffffff, opacity: 0.5 } ) );
    scene.add( line );
 
  } // end init();

  function onWindowResize() {

		windowHalfX = window.innerWidth / 2;
    windowHalfY = window.innerHeight / 2;

    camera.aspect = window.innerWidth / window.innerHeight;
    camera.updateProjectionMatrix();

    renderer.setSize( window.innerWidth, window.innerHeight );

  }

	function onDocumentMouseMove(event) {

  	mouseX = event.clientX - windowHalfX;
    mouseY = event.clientY - windowHalfY;

  }

  function onDocumentTouchStart( event ) {

  	if ( event.touches.length > 1 ) {

    	event.preventDefault();

      mouseX = event.touches[ 0 ].pageX - windowHalfX;
      mouseY = event.touches[ 0 ].pageY - windowHalfY;

  	}
	}

	function onDocumentTouchMove( event ) {

  	if ( event.touches.length == 1 ) {

    	event.preventDefault();

      mouseX = event.touches[ 0 ].pageX - windowHalfX;
      mouseY = event.touches[ 0 ].pageY - windowHalfY;

    }
	}

	function animate() {
		requestAnimationFrame( animate );
//		render();
   requestAnimationFrame( animate );
  renderer.render( scene, camera );
  controls.update(); 
  }

</script>

threejs canvasrenderer gradient background css.markdown

threejs canvasrenderer gradient background css

A Pen by Billimarie Robinson on CodePen.

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