three.js shader使用step函数实现区域着色

step function in three.js

three, shader, step

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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);
}

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CSS

HTML

step function in three.js

three, shader, step

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step function in three.js

three, shader, step

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