ogl实现一个webgl等高线动画效果代码-html代码-BFW代码库

代码语言：html

所属分类：动画

代码描述：ogl实现一个webgl等高线动画效果代码

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>
.gui {
  box-sizing: border-box;
}
.gui input,
.gui textarea,
.gui select,
.gui button,
.gui label {
  display: block;
  width: 100%;
  margin: 0px;
  border: none;
  border-radius: 0px;
}

.root.gui {
  position: absolute;
  display: flex;
  flex-direction: column;
  top: 0px;
  left: 0px;
  width: 250px;
  max-height: 100vh;
  padding: 0px;
  background: rgba(20, 20, 20, 0.5);
  transition: top 300ms ease-in-out;
}

.options-container.gui {
  flex: 1 1 auto;
  overflow: auto;
  padding: 15px;
  padding-bottom: 0px;
}

.expand-button.gui {
  display: flex;
  align-items: center;
  justify-content: center;
  flex: 0 0 auto;
  margin: 0px;
  height: 35px;
  margin-top: 10px;
  background: none !important;
  font-family: monospace;
  color: #fff;
  font-size: 15px;
}
.expand-button.gui:hover {
  text-decoration: underline;
}
.expand-button.gui::before {
  content: "";
  display: block;
  position: absolute;
  bottom: 35px;
  left: 30px;
  right: 30px;
  height: 1px;
  background: #ddd;
}

.input-container.gui {
  margin-bottom: 15px;
}

input.gui {
  padding: 5px;
  font-family: monospace;
}

textarea.gui {
  resize: vertical;
  min-width: 100%;
  font-family: monospace;
  white-space: pre;
}

.checkbox-container.gui {
  display: flex;
  align-items: center;
  margin-bottom: 8px;
}
.checkbox-container.gui input[type=checkbox].gui {
  width: 16px;
  height: 16px;
  flex: 0 0 auto;
}
.checkbox-container.gui label.gui {
  flex: 1 1 auto;
  margin-bottom: 0px;
  margin-left: 7px;
}

.slider-value.gui {
  margin-left: 4px;
  font-size: 15px;
}

select.gui {
  padding: 5px;
}

button.gui {
  color: #000;
  background: #d4a20b;
  border-radius: 1px;
  padding: 8px;
  margin-bottom: 12px;
  cursor: pointer;
}
button.gui:hover {
  background: #b58902;
}

label.gui {
  margin-bottom: 5px;
  font-weight: bold;
}

.text.gui {
  font-family: monospace;
  color: #fff;
  font-size: 15px;
  line-height: 1.1;
}

.text-block.gui {
  margin-bottom: 5px;
}

hr.gui {
  color: #ddd;
}

.spacer.gui {
  width: 100%;
  background: none;
}

body {
  margin: 0;
  padding: 0;
  width: 100vw;
  height: 100vh;
  background: #000;
}

#scene {
  width: 100%;
  height: 100%;
  overflow: hidden;
}
</style>


</head>

<body  >
  <div id="scene"></div>


<script id="vertex-shader" type="x-shader/x-vertex">
  precision highp float;
  
  attribute vec3 position;
  
  void main() {
    gl_Position = vec4(position, 1.0);
  }
</script>
<script id="fragment-shader" type="x-shader/x-fragment">
  precision highp float;
  
  const float AA_SAMPLES = 4.0;
  const float AA_TOTAL_PASSES = AA_SAMPLES * AA_SAMPLES;
  
  uniform float time;
  uniform vec2 mouse_pos;
  uniform bool mouse_active;
  uniform vec2 resolution;
  
  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);
  }
  
  vec2 rand2(vec2 p) {
    vec2 a = vec2(
      dot(p, vec2(12.9898, 78.233)),
      dot(p, vec2(127.1, 311.7))
    );
    return fract(sin(mod(a, 3.1415926535)) * 43758.5453);
  }
  
  float sdf(in vec2 uv) {
    float a = 2.0 * sin(time);
    float b = -2.0;
    float c = 3.0 * cos(time);
    float d = 1.5;
    float e = 2.0 * sin(0.5 * time) - 2.0;
    float f = 2.0;
    return a * uv.x * uv.x * uv.x
      + b * uv.y * uv.y * uv.y
      + c * uv.x * uv.x
      + d * uv.y * uv.y
      + e * uv.x
      + f * uv.y;
  }
  
  vec3 pass(vec2 fragCoord) {
    vec2 uv = 2.0 * (fragCoord.xy / resolution.xy) - 1.0;
    uv.x *= resolution.x / resolution.y;
    uv *= 1.3;
    uv.y += 0.5;
    
    float d = sdf(uv);
    float dMod = mod(0.5 * d, 1.0);
    vec3 color;
    
    if (abs(d) < 12.0) {
      if (dMod < 0.05) {
        color = vec3(1.0, 1.0, 1.0);
      } else {
        vec3 hsv = vec3(
          0.6,
          0.7,
          dMod
        );
        color = hsv2rgb(hsv);
      }
    }
    
    return color;
  }
  
  void main() {
    vec3 color = pass(gl_FragCoord.xy);
    for (float i = 0.0; i < AA_SAMPLES; i++) {
      for (float j =.........完整代码请登录后点击上方下载按钮下载查看