webgl+canvas实现可配置参数的道路旅途行驶三维景色动画效果代码-html代码-BFW代码库

代码语言：html

所属分类：三维

代码描述：webgl+canvas实现可配置参数的道路旅途行驶三维景色动画效果代码，可调节三峰大小远近、视角的位置。

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 {
  height: 100vh;
  margin: 0;
}
body, html, #glcanvas {
overflow: hidden
}
canvas {
  display: block;
  width: 100vw;
  height: 100vh;
}
</style>

  
  
  
</head>

<body translate="no">
  <canvas id="glcanvas"></canvas>
  <script id="vertex-shader" type="x-shader/x-vertex">
    attribute vec2 a_position;
    void main() {
      gl_Position = vec4(a_position, 0.0, 1.0);
    }
  </script>
<script id="fragment-shader" type="x-shader/x-fragment">
#ifdef GL_ES
precision mediump float;
#endif

uniform vec2 u_resolution;
uniform vec2 u_mouse;
uniform float u_time;
uniform float u_terrainHeight;
uniform float u_terrainNoise;
uniform float u_camPosY;
uniform float u_lookAtY;
uniform float u_speedZ;

vec3 palette( float t ) {
    vec3 a = vec3(0.5, 0.5, 0.0);
    vec3 b = vec3(0.5, 0.5, 0.5);
    vec3 c = vec3(1.0, 1.0, 1.0);
    vec3 d = vec3(0.25,0.4,0.55);

    return a + b*cos( 6.28318*(c*t+d) );
}
vec3 palette2( float t ) {
    vec3 a = vec3(0.5, 0.5, 0.5);
    vec3 b = vec3(0.5, 0.5, 0.5);
    vec3 c = vec3(1.0, 1.0, 1.0);
    vec3 d = vec3(0.25,0.4,0.55);

    return a + b*cos( 6.28318*(c*t+d) );
}
float hash(vec3 p) {
    p = 50.0 * fract(p * 0.3183099 + vec3(0.71, 0.113, 0.5));
    return -1.0 + 2.0 * fract(p.x * p.y * p.z * (p.x + p.y + p.z));
}

float noiseF(vec3 p) {
    vec3 i = floor(p);
    vec3 f = fract(p);
    float a = hash(i);
    float b = hash(i + vec3(1.0, 0.0, 0.0));
    float c = hash(i + vec3(0.0, 1.0, 0.0));
    float d = hash(i + vec3(1.0, 1.0, 0.0));
    float e = hash(i + vec3(0.0, 0.0, 1.0));
    float f1 = hash(i + vec3(1.0, 0.0, 1.0));
    float g = hash(i + vec3(0.0, 1.0, 1.0));
    float h = hash(i + vec3(1.0, 1.0, 1.0));
    vec3 u = f * f * (3.0 - 2.0 * f);
    return mix(mix(mix(a, b, u.x), mix(c, d, u.x), u.y), mix(mix(e, f1, u.x), mix(g, h, u.x), u.y), u.z);
}
vec3 warp(vec3 p) {
    vec3 offset = vec3(noiseF(p + u_time));
    return p + offset;
}
vec2 rotate(vec2 pos, float angle) {
    float cosAngle = cos(angle);
    float sinAngle = sin(angle);
    mat2 rotationMatrix = mat2(cosAngle, -sinAngle, sinAngle, cosAngle);
    return rotationMatrix * pos;
}

vec3 getRayDirection(vec2 uv, vec3 camPos, vec3 camForward, vec3 camRight, vec3 camUp, float fov) {
    vec3 dir = camForward + uv.x * camRight * fov + uv.y * camUp * fov;
    return normalize(dir);
}
float oscillate(float time, float minVal, float maxVal) {
    float sineWave = sin(time);
    float normalizedSine = (sineWave + 1.0) / 2.0;
    return mix(minVal, maxVal, normalizedSine);
}
float waveX(float z){
    return sin((z + u_time) * 0.1) * 10.0;
}
float waveXOffset(float z, float zOffset) {
    return sin((z + zOffset + u_time) * 0.1) * 10.0;
}

float boxSDF(vec3 p, vec3 bsize) {
    p.x += waveX(p.z);
    vec3 d = vec3(mod(p.x, 3.0) - 1.5, p.y * 2.0, mod(p.z, 3.0) - 1.5);
    d = abs(d) - bsize;
        if (p.x < -3.0 || p.x > 3.0) {
        return 100.0;
    }
    return length(max(d, 0.0)) + min(max(d.x, max(d.y, d.z)), 0.0);
}
float roadSDF(vec3 p, vec3 bsize) {
    p.x += waveX(p.z);
    vec3 repeatedPos = vec3(p.x, p.y, mod(p.z, 6.0) - 3.0);
    vec3 d = abs(repeatedPos) - bsize;
    return length(max(d, 0.0)) + min(max(d.x, max(d.y, d.z)), 0.0);
}
float sphereSDF( vec3 p, float size )
{
  float noise = noiseF(p + u_time);
  p = mod(p + noise, 100.0) - 50.0 * 0.5;
  return length(p)-size;
}
float terrainSDF(vec3 p) {
    float scale = u_terrainNoise;
    float height = u_terrainHeight;
    p.x += waveX(p.z);
    float baseTerrainHeight = max(0.0, noiseF(vec3(p.x * scale, 0.0, p.z * scale)) * height);
    float detailNoise1 = max(0.0, noiseF(vec3(p.x * scale * 2.0, 0.0, p.z * scale * 2.0)) * height * 0.5);
    float detailNoise2 = max(0.0, noiseF(vec3(p.x * scale * 4.0, 0.0, p.z * scale * 4.0)) * height * 0.25);
    float detailNoise3 = max(0.0, noiseF(vec3(p.x * scale * 6.0, 0.0, p.z * scale * 6.0)) * height * 0.1);
    float totalHeight = baseTerrainHeight + detailNoise1 + detailNoise2 + detailNoise3;
    float distanceFromCenter = abs(p.x) - 20.0;
    float terrain = p.y - totalHeight;
    return max(terrain, -distanceFromCenter);
}
vec3 sky(vec2 uv) {
    uv.x += noiseF(vec3(uv.x * 0.5, uv.y * 0.5, uv.y * 0.5));
    uv.y += noiseF(vec3(uv.x * 0.5, uv.y * 0.5, uv.y * 0.5));
    float angle = atan(uv.y, uv.x);
    float radius = length(uv);
    float spiral = sin(radius * u_time * 0.001 - u_time * 2.0 + angle * 4.0);
    float t = 5.0 + 0.1 * spiral + u_time * 0.1 + radius * 0.4;
    vec3 color = palette2(t + u_time/200.0) * 0.2;
    return color;
}

float sceneSDF(vec3 p, vec3 camPos) {
    float road = roadSDF(p, vec3(20.0, 0.0, 10.0));
    float stripes = boxSDF(p, vec3(0.2, 0.0, 1.0)); 
    float terrain = terrainSDF(p);
    return min(road, min(terrain, stripes));
}
vec3 getColor(vec3 worldPos, vec3 camPos) {
    float roadDist = roadSDF(worldPos, vec3(10.0, 0.0, 10.0));
    float stripeDist = boxSDF(worldPos, vec3(0.2, 1.0, 1.0));
    float reverseWave = waveXOffset(camPos.z, -25.0);
    float terrainDist = terrainSDF(worldPos);
    float closestDist = min(terrainDist, min(roadDist, stripeDist));
    if(closestDist == terrainDist){
        return palette(exp(length((worldPos.y)* 0.02)) + u_time/50.0);
    }
	if (closestDist == roadDist) {
        worldPos.x += waveX(worldPos.z);
        return palette(exp(-length((worldPos.x )* 0.011)) + u_time/20.0);
    } else if (closestDist == stripeDist) {
        worldPos.x += waveX(worldPos.z);
        return palette(exp(length((worldPos.x )* 0.11)) + u_time/20.0);
    }
    return vec3(0.0);
}

float rayMarch(vec3 ro, vec3 rd) {
    float t = 0.0;
    float maxDist = 400.0;
    float hitThreshold = 0.003;
    
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