javascript - three.js SoftwareRenderer - 透明背景

Question

我正在玩三个 .js 示例之一 http://threejs.org/examples/#software_geometry_earth

如何使背景透明？以下不适用于 SoftwareRenderer(但它确实适用于 WebGLRenderer，但我需要使用 SoftwareRenderer)。

renderer = new THREE.SoftwareRenderer( { alpha: true } );
renderer.setClearColor( 0x000000, 0 );

有什么想法吗？

完整代码为:

        var container, stats;
        var camera, scene, renderer;
        var group;
        var mouseX = 0, mouseY = 0;

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

        init();
        animate();

        function init() {

            container = document.getElementById( 'container' );

            camera = new THREE.PerspectiveCamera( 60, window.innerWidth / window.innerHeight, 1, 2000 );
            camera.position.z = 500;

            scene = new THREE.Scene();

            group = new THREE.Group();
            scene.add( group );

            // earth

            var loader = new THREE.TextureLoader();
            loader.load( 'textures/land_ocean_ice_cloud_2048.jpg', function ( texture ) {

                var geometry = new THREE.SphereGeometry( 200, 20, 20 );

                var material = new THREE.MeshLambertMaterial( { map: texture, overdraw: 0.5 } );
                var mesh = new THREE.Mesh( geometry, material );
                group.add( mesh );

            } );

            // shadow

            var canvas = document.createElement( 'canvas' );
            canvas.width = 128;
            canvas.height = 128;

            var texture = new THREE.Texture( canvas );
            texture.needsUpdate = true;

            var geometry = new THREE.PlaneBufferGeometry( 0, 0, 0, 0 );
            var material = new THREE.MeshBasicMaterial( { map: texture, overdraw: 0.5 } );

            var mesh = new THREE.Mesh( geometry, material );
            mesh.position.y = - 250;
            mesh.rotation.x = - Math.PI / 2;
            group.add( mesh );

            renderer = new THREE.SoftwareRenderer( { alpha: true } );
            renderer.setClearColor( 0x000000, 0 );
            renderer.setSize( window.innerWidth, window.innerHeight );

            container.appendChild( renderer.domElement );

            document.addEventListener( 'mousemove', onDocumentMouseMove, 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 animate() {

            requestAnimationFrame( animate );

            render();
            // stats.update(); 

        }

        function render() {

            camera.position.x += ( mouseX - camera.position.x ) * 0.05;
            camera.position.y += ( - mouseY - camera.position.y ) * 0.05;
            camera.lookAt( scene.position );

            group.rotation.y -= 0.005;

            renderer.render( scene, camera );

        }

**编辑:here's a link to the softwareRenderer.js file我用了。我用 Sublime Text 打开它。

Answer 1

你需要设置:

renderer = new THREE.SoftwareRenderer({ alpha: true}); // just set this anyway , I didn't test this on false....

我有它为你工作，你需要编辑 renderers/SoftwareRenderer.js将行替换为:

  /*line85 :*/  context.fillRect( 0, 0, 0, 0 ); 

stops for the bg to be rendered

 /*line596 :*/  data[ poffset ++ ] = 0; 

像重新绘制一样停止填充 block ...

测试场景和飞机..和 css html 图像背景..我用了这个 http://threejs.org/examples/#software_geometry_earth没有地球，只是简化它以进行快速测试

这是一个非静态场景