webgl实现草原上的七星瓢虫三维爬行效果代码-html代码-BFW代码库

代码语言：html

所属分类：三维

代码描述：webgl实现草原上的七星瓢虫三维爬行效果代码

下面为部分代码预览，完整代码请点击下载或在bfwstudio webide中打开


<!DOCTYPE html>
<html lang="en" >

<head>

  <meta charset="UTF-8">
 
  
  
  
<style>
html {
  height: 100%;
}
body {
  background: #286870;
  background: -moz-linear-gradient(180deg, #286870 0%, #0b232b 62%, #588849 100%);
  background: -webkit-linear-gradient(180deg, #286870 0%, #0b232b 62%, #588849 100%);
  background: linear-gradient(180deg, #286870 0%, #0b232b 62%, #588849 100%);
  overflow: hidden;
  padding: 0;
  margin: 0;
  width: 100%;
  height: 100%;
  min-height: 100vh;
  display: flex;
  align-items: center;
  position: relative;
}
canvas {
  box-sizing: border-box;
  padding: 0;
  margin: 0;
  outline: none;
  box-shadow: 2px 20px 13px rgba(0, 0, 0, 0.75);
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 800px;
  height: 450px;
  z-index: 0;
}
</style>



</head>

<body >
  <!-- VertexShader code here -->
<script id="vertexShader" type="x-shader/x-vertex">#version 300 es
precision highp float;
in vec4 vPosition;
void main() {
        gl_Position = vPosition;
}
</script>
<!-- FragmentShader code here -->
<script id="fragmentShader" type="x-shader/x-fragment">#version 300 es
precision highp float;
out vec4 fragColor;
  
uniform vec4 mouse;
uniform vec2 resolution;
uniform float time;

#define R           resolution
#define T           time
#define M           mouse

#define PI  3.14159265359
#define PI2 6.28318530718

#define MAX_DIST    120.
#define MIN_DIST    .0005

float hash21(vec2 p) { return fract(sin(dot(p,vec2(23.86,48.32)))*4374.432); }
vec2  hash2( vec2 p) { return fract(sin(vec2(dot(p,vec2(127.1,311.7)),dot(p,vec2(269.5,183.3))))*43758.5453); }
vec3  hash3( vec2 p) {
    vec3 q = vec3( dot(p,vec2(127.1,311.7)), dot(p,vec2(269.5,183.3)), dot(p,vec2(419.2,371.9)) );
        return fract(sin(q)*43758.5453);
}

mat2 rot(float a) { return mat2(cos(a),sin(a),-sin(a),cos(a)); }
vec3 noised( in vec2 x ){
    vec2 f = fract(x);
    vec2 u = f*f*(3.0-2.0*f);
    vec2 p = vec2(floor(x));
    float a = hash21( p+vec2(0,0) );
        float b = hash21( p+vec2(1,0) );
        float c = hash21( p+vec2(0,1) );
        float d = hash21( p+vec2(1,1) );
        return vec3(a+(b-a)*u.x+(c-a)*u.y+(a-b-c+d)*u.x*u.y,
                   6.0*f*(1.0-f)*(vec2(b-a,c-a)+(a-b-c+d)*u.yx));
}

float fbm( vec2 p, float freq ) {       
        float h = -1.,w = 2.6,m = .35;
        for (float i = 0.; i < freq; i++) {
                h += w * noised((p * m)).x;
                w *= .5;
                m *= 2.;
        }
        return h;
}

vec2 truchet(vec2 uv, float scale) {
    uv *= scale;   
    vec2 grid = fract(uv)-.5;
    vec2 id = floor(uv);
    float hs = hash21(id);
    if(hs>.5) grid.x*=-1.;
    vec2 d2 = vec2(length(grid-.5), length(grid+.5));
    vec2 gx = d2.x<d2.y? vec2(grid-.5) : vec2(grid+.5);
    float circle = length(gx)-.5;
    circle=abs(circle)-.095;
    return vec2(clamp(circle,0.,1.),hs);
}

//@iq Voronoi Distances
//https://www.shadertoy.com/view/ldl3W8
vec4 voronoi( in vec2 x){
    vec2 n = floor(x);
    vec2 f = fract(x);
    float ox = 0.;
        float wave = 323.23123;
        vec2 mg, mr;

    float md = 8.;
    for( float j=-1.; j<=1.; j++ )
    for( float i=-1.; i<=1.; i++ )
    {
        vec2 g = vec2(i,j);
                vec2 o = hash2( n + g );

                o = .35 + .35 *sin(o * wave + PI2);
        vec2 r = g + o - f;
        float d = dot(r,r);
        if( d<md ){
            md = d;
            mr = r;
            mg = g;
        }
    }

    md = 8.;
    for( float j=-2.; j<=2.; j++ )
    for( float i=-2.; i<=2.; i++ )
    {
        vec2 g = mg + vec2(i,j);
                vec2 o = hash2( n + g );
        ox = o.x;
                o = .35 + .35 *sin(o * wave + PI2);
        vec2 r = g + o - f;
        if( dot(mr-r,mr-r)>.00001 )
        md = min( md, dot( .5*(mr+r), normalize(r-mr) ) );
    }
    return vec4( md, mr, ox );
}

//globals
vec3 hitPoint,hit;
mat2 rotA,rotB,rotC;

float box(vec3 p,vec3 s) {
    p=abs(p)-s; return max(p.x,max(p.y,p.z));
}

float box(vec2 p, vec2 b) {
    vec2 d = abs(p)-b; return length(max(d,0.0)) + min(max(d.x,d.y),0.0);
}

// Field created watching @nusans shader livestream
// with some improvisations on some things

float blade(vec3 p, float sc) {
    p/=sc; p.y-=1.5;
    p.zx+= abs(p.xz)*.1;
    float wd = sin((p.y+1.5)*1.5)*.1;
    float d = box(p,vec3(wd,1.5,wd));
    return d*sc*.8;
}

vec2 field(vec3 p, float rp) {
    vec2 res=vec2(1e5,0);
    vec2 id=floor(p.xz/rp-.5);
    float hs = hash21(id);
    p.xz=(fract(p.xz/rp-.5)-.5)*rp;

    p.xz*=rot(hs*PI2);
    float fs = hash21(id+3.4);
    float sc = .5+hs*.8;
    float b = blade(p,sc);
    if(b<res.x) res =vec2(b,1.);
    
    if(fs>.9) {
        float fb=length(p-vec3(0,sc*2.,0))-(sc*.075);
        if(fb<res.x) res =vec2(fb,6.);
    }
    return res;
}

vec2 grass(vec3 p) {
    vec2 res = vec2(1e5,0),d;
    
    p.xz +=sin(p.zx*.15+p.y*.1+T*3.)*.3*max(0.,p.y)*.5;
    d = field(p,1.75);
    if(d.x<res.x) res = d;
    
    p.xz*=rotA;
    p.x+=45.35;
    d = field(p,1.15);
    if(d.x<res.x) res = d;
  
    p.xz*=rotB;
    p.x+=141.5;
    d = field(p,.75);
    if(d.x<res.x) res = d;
 
    return res;
}

float specks(vec3 p,float rp) {
    p.z+=T*5.+abs(sin(T*.5-p.z*.01))*10.;
    p.xyz+=sin(p.zxy*vec3(.02,0,.07)+vec3(.1,.07,.05)*T)*5.5;
    p = (fract(p/rp-.5)-.5)*rp;   
    return length(p)-.05;
}

float mst=0.;
float mist(vec3 p) {  
    vec3 q = p;
    float d = specks(p,11.);
    p.xz*=rotC;
    p.yz*=rotB;
    d = min(specks(p,7.),d);
    
    d += max(.0,-(6.-q.y)*.025);
    return d; 
}

// The truchet path is something I made up, however I haven't
// found a good way of implimenting yet - tried some other 
// multi-tap systems so prevent the cutoff but not smart enough
// mathwise to know what I'm trying to do.
// well its not perfect but looks ok if you squint.

float gid,sid;
vec2 map(vec3 p, float sd) {
          vec2 res = vec2(1e5,0.);
    p.x+=T;
    vec3 pbk = p;
    float gnd = fbm(p.xz*.15,.1)*1.95;
    p.y+=gnd;
    
    vec2 uv = p.xz*.05;
    float py = p.y+.5;
    vec2 tc = truchet(p.xz,.05);
    float cc = tc.x;
    vec2 dx = grass(p);
    if(dx.x<res.x) {
        if(cc<.03){
           dx.x += max(.1,.15-cc*.25);
        }
       res = vec2(dx.x,dx.y);
       hit=p;
    }
   
    float mt3 = mist(p);

    if(mt3<res.x && sd>0.) {
       res = vec2(mt3,3.);
       mst +=clamp(.0025/(.00025+mt3*mt3) ,.0, max(.0, (gnd)*.015) );
       //mst += .0025/(.00025+mt3*mt3);
    }
    
    vec2 id = floor(p.xz*.05);
    vec2 guv= fract(p.xz*.05)-.5;
    
    float hs .........完整代码请登录后点击上方下载按钮下载查看