threejs的shader材質 顏色混合函式mix
阿新 • • 發佈:2018-12-15
float mix(floatx,float y,float a ) 返回x和y 的線性混合,即x(1-a)+ya
```![在這裡插入圖片描述](https://img-blog.csdn.net/20181017153331250?watermark/2/text/aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3JhbnJhbjEyNQ==/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70)<div id="container"></div> <script src="js/three.js"></script> <script src="js/Detector.js"></script> <script id="vertexShader" type="x-shader/x-vertex"> varying vec2 vUv; void main() { vUv = uv; vec4 mvPosition = modelViewMatrix * vec4( position, 1.0 ); gl_Position = projectionMatrix * mvPosition; } </script> <script id="fragmentShader" type="x-shader/x-fragment"> uniform float time; uniform bool isoriginColor; uniform sampler2D texture3; uniform sampler2D texture4; varying vec2 vUv; void main( void ) { vec2 position = - 1.0 + 2.0 * vUv; vec4 color3 = texture2D( texture3, vUv ); vec3 tarcolor =color3.rgb; float f1 =color3.a; vec4 color4 = texture2D( texture4, vUv ); float f2 =color4.a; if(isoriginColor == false){ tarcolor =mix(tarcolor.rgb,color4.rgb,f2); } gl_FragColor = vec4(tarcolor,1); } </script> <script> if ( ! Detector.webgl ) Detector.addGetWebGLMessage(); var container; var camera, scene, renderer; var uniforms; init(); animate(); function init() { container = document.getElementById( 'container' ); camera = new THREE.OrthographicCamera( - 1, 1, 1, - 1, 0, 1 ); scene = new THREE.Scene(); var geometry = new THREE.PlaneBufferGeometry( 2, 2 ); var textureLoader = new THREE.TextureLoader(); uniforms = { time: { value: 1.0 }, texture3:{value:textureLoader.load("time1.jpg" )}, texture4:{value:textureLoader.load("2.png" )} }; var material = new THREE.ShaderMaterial( { uniforms: uniforms, vertexShader: document.getElementById( 'vertexShader' ).textContent, fragmentShader: document.getElementById( 'fragmentShader' ).textContent } ); var mesh = new THREE.Mesh( geometry, material ); scene.add( mesh ); renderer = new THREE.WebGLRenderer(); renderer.setPixelRatio( window.devicePixelRatio ); container.appendChild( renderer.domElement ); onWindowResize(); window.addEventListener( 'resize', onWindowResize, false ); } function onWindowResize( event ) { renderer.setSize( window.innerWidth, window.innerHeight ); } // function animate( timestamp ) { requestAnimationFrame( animate ); uniforms.time.value = timestamp / 1000; renderer.render( scene, camera ); } </script> </body>
在這裡插入程式碼片
gl_FragColor = vec4(tarcolor.rgb+color4.rgb,1);
1 2 gl_FragColor = vec4(tarcolor.rgb-color4.rgb,1);
![在這裡插入圖片描述](https://img-blog.csdn.net/20181017155017578?watermark/2/text/aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3JhbnJhbjEyNQ==/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70)