three.js shader绘制十字架

use math functions to draw cross in three.js

three, shader, shape

《three.js使用多个渐变torus模拟光环光晕》申请公开！

第三方库
作品简介 1553
作品推荐
使用帮助
常用链接

HTML
CSS
JavaScript
Result

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 float u_time;

mat2 rotate2d(float _angle){
    return mat2(cos(_angle),-sin(_angle),
                sin(_angle),cos(_angle));
}

float box(in vec2 _st, in vec2 _size){
    _size = vec2(0.5) - _size*0.5;
    vec2 uv = smoothstep(_size,
                        _size+vec2(0.001),
                        _st);
    uv *= smoothstep(_size,
                    _size+vec2(0.001),
                    vec2(1.0)-_st);
    return uv.x*uv.y;
}

float cross(in vec2 _st, float _size){
    return  box(_st, vec2(_size,_size/4.)) +
            box(_st, vec2(_size/4.,_size));
}

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

// move space from the center to the vec2(0.0)
    st -= vec2(0.5);
    // rotate the space
    st = rotate2d( sin(u_time)*PI ) * st;
    // move it back to the original place
    st += vec2(0.5);

// Show the coordinates of the space on the background
    // color = vec3(st.x,st.y,0.0);

// Add the shape on the foreground
    color += vec3(cross(st,0.4));

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

use math functions to draw cross in three.js

three, shader, shape

编辑器支持Emmet

快捷键

use math functions to draw cross in three.js

three, shader, shape

three.js shader绘制泼墨（液体泼溅）模式

three.js shader绘制马赛克模式（包含一个二维随机函数）

编辑器支持Emmet

快捷键

语言：

语言：

导入代码模板：