【发布时间】：2020-08-28 06:38:31
【问题描述】：
我目前正在尝试使用 THREE.js 将此着色器转换到画布上：https://www.shadertoy.com/view/4sjXRG。这是我正在使用的功能，它适用于更简单的着色器。我想我可能需要将花车保存为制服，但我有点迷失了这个。有没有人按照这些思路做了一些事情并且知道问题可能是什么？我一直在使用这个指南：https://threejsfundamentals.org/threejs/lessons/threejs-shadertoy.html
const canvas = document.querySelector('#background');
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;
float ltime;
float noise(vec2 p)
{
return sin(p.x*10.) * sin(p.y*(3. + sin(ltime/11.))) + .2;
}
mat2 rotate(float angle)
{
return mat2(cos(angle), -sin(angle), sin(angle), cos(angle));
}
float fbm(vec2 p)
{
p *= 1.1;
float f = 0.;
float amp = .5;
for( int i = 0; i < 3; i++) {
mat2 modify = rotate(ltime/50. * float(i*i));
f += amp*noise(p);
p = modify * p;
p *= 2.;
amp /= 2.2;
}
return f;
}
float pattern(vec2 p, out vec2 q, out vec2 r) {
q = vec2( fbm(p + vec2(1.)),
fbm(rotate(.1*ltime)*p + vec2(3.)));
r = vec2( fbm(rotate(.2)*q + vec2(0.)),
fbm(q + vec2(0.)));
return fbm(p + 1.*r);
}
vec3 hsv2rgb(vec3 c)
{
vec4 K = vec4(1.0, 2.0 / 3.0, 1.0 / 3.0, 3.0);
vec3 p = abs(fract(c.xxx + K.xyz) * 6.0 - K.www);
return c.z * mix(K.xxx, clamp(p - K.xxx, 0.0, 1.0), c.y);
}
void mainImage( out vec4 fragColor, in vec2 fragCoord ) {
vec2 p = fragCoord.xy / iResolution.xy;
ltime = iTime;
float ctime = iTime + fbm(p/8.)*40.;
float ftime = fract(ctime/6.);
ltime = floor(ctime/6.) + (1.-cos(ftime*3.1415)/2.);
ltime = ltime*6.;
vec2 q;
vec2 r;
float f = pattern(p, q, r);
vec3 col = hsv2rgb(vec3(q.x/10. + ltime/100. + .4, abs(r.y)*3. + .1, r.x + f));
float vig = 1. - pow(4.*(p.x - .5)*(p.x - .5), 10.);
vig *= 1. - pow(4.*(p.y - .5)*(p.y - .5), 10.);
fragColor = vec4(col*vig,1.);
}
void main() {
mainImage(gl_FragColor, gl_FragCoord.xy);
}
`;
const uniforms = {
iTime: { value: 0 },
iResolution: { value: new THREE.Vector3() },
};
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.heigth, 1);
uniforms.iTime.value = time;
renderer.render(scene, camera);
requestAnimationFrame(render);
}
requestAnimationFrame(render);
}
main();```
【问题讨论】：
标签： javascript three.js glsl shader fragment-shader