three.js shader使用mix函数实现多个图形叠加绘制

demo mix functions in shader of three.js

three, shader, mix

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编译

JavaScript

var container;
var camera, scene, renderer;
var uniforms;

init();
animate();

function init() {
    container = document.getElementById('container');

camera = new THREE.Camera();
    camera.position.z = 1;

scene = new THREE.Scene();

var geometry = new THREE.PlaneBufferGeometry(2, 2);

uniforms = {
        u_time: {
            type: "f",
            value: 1.0
        },
        u_resolution: {
            type: "v2",
            value: new THREE.Vector2()
        },
        u_mouse: {
            type: "v2",
            value: new THREE.Vector2()
        }
    };

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);

document.onmousemove = function(e) {
        uniforms.u_mouse.value.x = e.pageX
        uniforms.u_mouse.value.y = e.pageY
    }
}

function onWindowResize(event) {
    renderer.setSize(container.offsetWidth, container.offsetHeight);
    uniforms.u_resolution.value.x = renderer.domElement.width;
    uniforms.u_resolution.value.y = renderer.domElement.height;
}

function animate() {
    requestAnimationFrame(animate);
    render();
}

function render() {
    uniforms.u_time.value += 0.05;
    renderer.render(scene, camera);
}

编译

CSS

HTML

#define PI 3.14159265359

uniform vec2 u_resolution;
uniform vec2 u_mouse;
uniform float u_time;

vec3 colorA = vec3(0.149,0.141,0.912);
vec3 colorB = vec3(1.000,0.833,0.224);

float plot (vec2 st, float pct){
  return  smoothstep( pct-0.01, pct, st.y) -
          smoothstep( pct, pct+0.01, st.y);
}

void main() {
    vec2 st = gl_FragCoord.xy/u_resolution.xy;
    vec3 color = vec3(0.0);

vec3 pct = vec3(st.x);

pct.r = smoothstep(0.0,1.0, st.x);
    pct.g = sin(st.x*PI);
    pct.b = pow(st.x,0.5);

color = mix(colorA, colorB, pct);

// Plot transition lines for each channel
    color = mix(color,vec3(1.0,0.0,0.0),plot(st,pct.r));
    color = mix(color,vec3(0.0,1.0,0.0),plot(st,pct.g));
    color = mix(color,vec3(0.0,0.0,1.0),plot(st,pct.b));

gl_FragColor = vec4(color,1.0);
}
</script>

demo mix functions in shader of three.js

three, shader, mix

编辑器支持Emmet

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demo mix functions in shader of three.js

three, shader, mix

three.js shader绘制马赛克模式（包含一个二维随机函数）

Three.js ExtrudeGeometry塑形模型使用实例

编辑器支持Emmet

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