three+webgl实现晶莹剔透的茶杯旋转效果代码-html代码-BFW代码库

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所属分类：三维

代码描述：three+webgl实现晶莹剔透的茶杯旋转效果代码

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>
body {
  margin: 0;
  padding: 0;
}

#container {
  position: fixed;
  touch-action: none;
}
</style>




</head>

<body >
<script type="text/javascript" src="//repo.bfw.wiki/bfwrepo/js/three.88.js"></script>
<script id="vertexShader" type="x-shader/x-vertex">
    void main() {
        gl_Position = vec4( position, 1.0 );
    }
</script>
<script id="fragmentShader" type="x-shader/x-fragment">
    uniform vec2 u_resolution;
    uniform float u_time;
    uniform vec2 u_mouse;
  uniform sampler2D u_noise;
  
    const int octaves = 2;
    const float seed = 43758.5453123;
    const float seed2 = 73156.8473192;
    // Epsilon value
    const float eps = 0.05;
  
    const vec3 ambientLight = 0.99 * vec3(1.0, 1.0, 1.0);
    const vec3 light1Pos = vec3(10., 5.0, -25.0);
    const vec3 light1Intensity = vec3(0.35);
    const vec3 light2Pos = vec3(-20., -25.0, 85.0);
    const vec3 light2Intensity = vec3(0.2);
  
    // movement variables
    vec3 movement = vec3(.0);

    // Gloable variables for the raymarching algorithm.
    const int maxIterations = 256;
    const int maxIterationsShad = 16;
    const float stepScale = .7;
    const float stopThreshold = 0.001;
  
  vec3 hash33(vec3 p){ 
    return texture2D(u_noise, p.xy * p.z * 256.).rgb;
  }

  float pn( in vec3 p ) {
    vec3 i = floor(p); p -= i; p *= p*(3. - 2.*p);
    p.xy = texture2D(u_noise, (p.xy + i.xy + vec2(37, 17)*i.z + .5)/256., -100.).yx;
    return mix(p.x, p.y, p.z);
  }
  
  // Thanks to Shane for this one.
  // Basic low quality noise consisting of three layers of rotated, mutated 
  // trigonometric functions. Needs work, but sufficient for this example.
  float trigNoise3D(in vec3 p){


      float res = 0., sum = 0.;

      // IQ's cheap, texture-lookup noise function. Very efficient, but still 
      // a little too processor intensive for multiple layer usage in a largish 
      // "for loop" setup. Therefore, just one layer is being used here.
      float n = pn(p*8. + u_time*.5);


      // Two sinusoidal layers. I'm pretty sure you could get rid of one of 
      // the swizzles (I have a feeling the GPU doesn't like them as much), 
      // which I'll try to do later.

      vec3 t = sin(p.yzx*3.14159265 + cos(p.zxy*3.14159265+1.57/2.))*0.5 + 0.5;
      p = p*1.5 + (t - 1.5); //  + u_time*0.1
      res += (dot(t, vec3(0.333)));

      t = sin(p.yzx*3.14159265 + cos(p.zxy*3.14159265+1.57/2.))*0.5 + 0.5;
      res += (dot(t, vec3(0.333)))*0.7071;    

    return ((res/1.7071))*0.85 + n*0.15;
  }
  
  mat4 rotationMatrix(vec3 axis, float angle)
  {
      axis = normalize(axis);
      float s = sin(angle);
      float c = cos(angle);
      float oc = 1.0 - c;

      return mat4(oc * axis.x * axis.x + c,           oc * axis.x * axis.y - axis.z * s,  oc * axis.z * axis.x + axis.y * s,  0.0,
                  oc * axis.x * axis.y + axis.z * s,  oc * axis.y * axis.y + c,           oc * axis.y * axis.z - axis.x * s,  0.0,
                  oc * axis.z * axis.x - axis.y * s,  oc * axis.y * axis.z + axis.x * s,  oc * axis.z * axis.z + c,           0.0,
                  0.0,                                0.0,                                0.0,                                1.0);
  }
  
  
  float length2( vec2 p )
  {
    return sqrt( p.x*p.x + p.y*p.y );
  }

  float length6( vec2 p )
  {
    p = p*p*p; p = p*p;
    return pow( p.x + p.y, 1.0/6.0 );
  }

  float length8( vec2 p )
  {
    p = p*p; p = p*p; p = p*p;
    return pow( p.x + p.y, 1.0/8.0 );
  }
  
  // Distance function primitives
  // Reference: http://iquilezles.org/www/articles/distfunctions/distfunctions.htm
  float sdBox( vec3 p, vec3 b )
  {
    vec3 d = abs(p) - b;
    return min(max(d.x,max(d.y,d.z)),0.0) + length(max(d,0.0));
  }
  float udBox( vec3 p, vec3 b )
  {
    return length(max(abs(p)-b,0.0));
  }
  float udRoundBox( vec3 p, vec3 b, float r )
  {
    return length(max(abs(p)-b,0.0))-r;
  }
  float sdSphere( vec3 p, float s )
  {
    return length(p)-s;
  }
  float sdCylinder( vec3 p, vec3 c )
  {
    return length(p.xz-c.xy)-c.z;
  }
  float sdCappedCylinder( vec3 p, vec2 h )
  {
    vec2 d = abs(vec2(length(p.xz),p.y)) - h;
    return min(max(d.x,d.y),0.0) + length(max(d,0.0));
  }
  float sdTorus82( vec3 p, vec2 t )
  {
    vec2 q = vec2(length2(p.xz)-t.x,p.y);
    return length8(q)-t.y;
  }
  float sdPlane( vec3 p)
  {
    return p.y;
  }
  float sdTorus( vec3 p, vec2 t )
{
  vec2 q = vec2(length(p.xz)-t.x,p.y);
  return length(q)-t.y;
}
  
  // smooth min
  // reference: http://iquilezles.org/www/articles/smin/smin.htm
  float smin(float a, float b, float k) {
      float res = exp(-k*a) + exp(-k*b);
      return -log(res)/k;
  }

  float smax(float a,float b, float k)
  {
      return -smin(-a,-b,k);
  }
  
  vec3 random3( vec3 p ) {
      return fract(sin(vec3(dot(p,vec3(127.1,311.7,319.8)),dot(p,vec3(269.5,183.3, 415.2)),dot(p,vec3(362.9,201.5,134.7))))*43758.5453);
  }
  vec2 random2( vec2 p ) {
      return fract(sin(vec2(dot(p,vec2(127.1,311.7)),dot(p,vec2(269.5,183.3))))*43758.5453);
  }
  float tri( float x ){ 
  return abs( fract(x) - .5 );
}

vec3 tri3( vec3 p ){
 
  return vec3( 
      tri( p.z + tri( p.y * 1. ) ), 
      tri( p.z + tri( p.x * 1. ) ), 
      tri( p.y + tri( p.x * 1. ) )
  );

}
                                 

float triNoise3D( vec3 p, float spd , float time){
  
  float z  = 1.4;
	float rz =  0.;
  vec3  bp =   p;

	for( float i = 0.; i <= 3.; i++ ){
   
    vec3 dg = tri3( bp * 2. );
    p += ( dg + time * .1 * spd );

    bp *= 1.8;
		z  *= 1.5;
		p  *= 1.2; 
      
    float t = tri( p.z + tri( p.x + tri( p.y )));
    rz += t / z;
    bp += 0.14;

	}

	return rz;

}
  mat4 rotmat;
  
  // The world!
  float world_sdf(in vec3 p, inout int id) {
    float world = 10.;
    
    p = (vec4(p, 1.) * rotmat).xyz;
    
    vec3 _p = p;
    
    _p.y *= .8;
    float ctime = cos(u_time*.5);
    _p.xz += sin(p.y * 25. + 5.5 + ctime * 4.) * p.xz * .05;
    _p.xz += smoothstep(-.5, .2, _p.y) * p.xz * .5;
    float ymod = sin(p.y * 80. + ctime * 10.) * .002;
    _p += ymod + sin(p.x * 50.) * .2 * sin(p.z * 20.) * ymod;
    // p.xz *= 1. + sin(p.y * 1.5 + .1) * 5.;
    
    world = sdSphere(_p, .5);
    world = smax(p.y - .5, world, 10.);
    world = smax(-sdSphere(_p - vec3(0., .2, 0.), .33), world, 10.);
    world = max(-p.y - .5, world);
    
    float table = sdCappedCylinder(p+vec3(0., .53, 0.), vec2(.7, .03));
    
    if(table < world) {
      id = 2;
      return table;
    } else {
      id = 1;
      return world;
    }
    
    return world;
  }
  float world_sdf(in vec3 p) {
    int id;
    return world_sdf(p, id);
  }
  
  
  // Fuck yeah, normals!
  vec3 calculate_normal(in vec3 p)
  {
    const vec3 small_step = vec3(0.0001, 0.0, 0.0);
    
    float gradient_x = world_sdf(vec3(p.x + eps, p.y, p.z)) - world_sdf(vec3(p.x - eps, p.y, p.z));
    float gradient_y = world_sdf(vec3(p.x, p.y + eps, p.z)) - world_sdf(vec3(p.x, p.y - eps, p.z));
    float gradient_z = world_sdf(vec3(p.x, p.y, p.z  + eps)) - world_sdf(vec3(p.x, p.y, p.z - eps));
    
    vec3 normal = vec3(gradient_x, gradient_y, gradient_z);

    return normalize(normal);
  }

  // Raymarching.
  float rayMarching( vec3 origin, vec3 dir, float start, float end, inout float field, inout int id ) {
    
    float sceneDist = 1e4;
    float rayDepth = start;
    for ( int i = 0; i < maxIterations; i++ ) {
      sceneDist = world_sdf( origin + dir * rayDepth, id ); // Distance from the point along the ray to the nearest surface point in the scene.

      if (( sceneDist < stopThreshold ) || (rayDepth >= end)) {        
        break;
      }
      // We haven't hit anything, so increase the depth by a scaled factor of the minimum scene distance.
      rayDepth += sceneDist * stepScale;
    }
  
    if ( sceneDist >= stopThreshold ) rayDepth = end;
    else rayDepth += sceneDist;
      
    // We've used up our maximum iterations. Return the maximum distance.
    return rayDepth;
  }
  

  // Shadows
  // Reference at: http://www.iquilezles.org/www/articles/rmshadows/rmshadows.htm
  float softShadow(vec3 ro, vec3 lightPos, float start, float k){
    
      vec3 rd = lightPos - ro;
      float end = length(rd);

      float shade = 1.0;

      float dist = start;
      .........完整代码请登录后点击上方下载按钮下载查看