three.js shadertoy中iChannel0常量的实现例子

iChannel0在shadertoy里代表第一个贴图通道。本例演示在three.js中如何使用TextureLoader来实现该常量。

three, shadertoy, shader

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<canvas id="c"></canvas>
<script type="module">
import * as THREE from '//techbrood.com/threejs/build/three.module.js';

function main() {
  const canvas = document.querySelector('#c');
  const renderer = new THREE.WebGLRenderer({canvas});
  renderer.autoClearColor = false;

const camera = new THREE.OrthographicCamera(
    -1, // left
     1, // right
     1, // top
    -1, // bottom
    -1, // near,
     1, // far
  );
  const scene = new THREE.Scene();
  const plane = new THREE.PlaneBufferGeometry(2, 2);

const fragmentShader = `
  #include <common>

uniform vec3 iResolution;
  uniform float iTime;
  uniform sampler2D iChannel0;

#define TIMESCALE 0.25 
  #define TILES 8
  #define COLOR 0.7, 1.6, 2.8

void mainImage( out vec4 fragColor, in vec2 fragCoord )
  {
    vec2 uv = fragCoord.xy / iResolution.xy;
    uv.x *= iResolution.x / iResolution.y;
    
    vec4 noise = texture2D(iChannel0, floor(uv * float(TILES)) / float(TILES));
    float p = 1.0 - mod(noise.r + noise.g + noise.b + iTime * float(TIMESCALE), 1.0);
    p = min(max(p * 3.0 - 1.8, 0.1), 2.0);
    
    vec2 r = mod(uv * float(TILES), 1.0);
    r = vec2(pow(r.x - 0.5, 2.0), pow(r.y - 0.5, 2.0));
    p *= 1.0 - pow(min(1.0, 12.0 * dot(r, r)), 2.0);
    
    fragColor = vec4(COLOR, 1.0) * p;
  }

void main() {
    mainImage(gl_FragColor, gl_FragCoord.xy);
  }
  `;
  const loader = new THREE.TextureLoader();
  const texture = loader.load('/uploads/1912/grass_texture.jpg');
  texture.minFilter = THREE.NearestFilter;
  texture.magFilter = THREE.NearestFilter;
  texture.wrapS = THREE.RepeatWrapping;
  texture.wrapT = THREE.RepeatWrapping;
  const uniforms = {
    iTime: { value: 0 },
    iResolution:  { value: new THREE.Vector3() },
    iChannel0: { value: texture },
  };
  const material = new THREE.ShaderMaterial({
    fragmentShader,
    uniforms,
  });
  scene.add(new THREE.Mesh(plane, material));

function resizeRendererToDisplaySize(renderer) {
    const canvas = renderer.domElement;
    const width = canvas.clientWidth;
    const height = canvas.clientHeight;
    const needResize = canvas.width !== width || canvas.height !== height;
    if (needResize) {
      renderer.setSize(width, height, false);
    }
    return needResize;
  }

function render(time) {
    time *= 0.001;  // convert to seconds

resizeRendererToDisplaySize(renderer);

const canvas = renderer.domElement;
    uniforms.iResolution.value.set(canvas.width, canvas.height, 1);
    uniforms.iTime.value = time;

renderer.render(scene, camera);

requestAnimationFrame(render);
  }

requestAnimationFrame(render);
}

main();

</script>

iChannel0在shadertoy里代表第一个贴图通道。本例演示在three.js中如何使用TextureLoader来实现该常量。

three, shadertoy, shader

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iChannel0在shadertoy里代表第一个贴图通道。本例演示在three.js中如何使用TextureLoader来实现该常量。

three, shadertoy, shader

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