使用 Three.js 实现**雷达着色器**，具体要求：

【核心特效】
- 多层雷达圆环叠加
- 动态扫描线和十字标记
- 三角形方向标记
- 动态圆点标记

【场景与光照】
- 深色背景
- 俯视视角 (相机 y=800)
- OrbitControls 轨道控制器
- 自定义着色器实现复杂图案

【交互与控制】
- OrbitControls 鼠标拖拽旋转
- 鼠标滚轮缩放
- 自动播放动画

【技术要求】
- Three.js 版本 (ES Module)
- 自定义 ShaderMaterial 实现多种图形
- GLSL 距离函数和图案组合
- 实时动画更新

float circle(vec2 uv, vec2 center, float radius, float width)
{
  float r = length(uv - center);
  return SMOOTH(r-width/2.0,radius)-SMOOTH(r+width/2.0,radius);
}

float triangles(vec2 uv, vec2 center, float radius)
{
  vec2 d = uv - center;
  return RS(-8.0, 0.0, d.x-radius) * (1.0-smoothstep( 7.0+d.x-radius,9.0+d.x-radius, abs(d.y)))
      + RS( 0.0, 8.0, d.x+radius) * (1.0-smoothstep( 7.0-d.x-radius,9.0-d.x-radius, abs(d.y)))
      + RS(-8.0, 0.0, d.y-radius) * (1.0-smoothstep( 7.0+d.y-radius,9.0+d.y-radius, abs(d.x)))
      + RS( 0.0, 8.0, d.y+radius) * (1.0-smoothstep( 7.0-d.y-radius,9.0-d.y-radius, abs(d.x)));
}

float bip1(vec2 uv, vec2 center)
{
  return SMOOTH(length(uv - center),3.0);
}

float bip2(vec2 uv, vec2 center)
{
  float r = length(uv - center);
  float R = 8.0+mod(87.0*iTime, 80.0);
  return (0.5-0.5*cos(30.0*iTime)) * SMOOTH(r,5.0)
      + SMOOTH(6.0,r)-SMOOTH(8.0,r)
      + smoothstep(max(8.0,R-20.0),R,r)-SMOOTH(R,r);
}

#define MOV(a,b,c,d,t) (vec2(a*cos(t)+b*cos(0.1*(t)), c*sin(t)+d*cos(0.1*(t))))

void main() {
  vec2 c = vec2(iResolution.x / 2.0, iResolution.y / 2.0);
  vec3 finalColor;
  finalColor = vec3( 0.3*_cross(uv, c, 240.0) );
  finalColor += ( circle(uv, c, 100.0, 1.0)
              + circle(uv, c, 165.0, 1.0) ) * blue1;
  finalColor += circle3(uv, c, 313.0, 4.0) * blue1;
  finalColor += triangles(uv, c, 315.0 + 30.0*sin(iTime)) * blue2;

  if( length(uv-c) < 240.0 )
  {
    vec2 p = 130.0*MOV(1.3,1.0,1.0,1.4,3.0+0.1*iTime);
    finalColor += bip1(uv, c+p) * vec3(1,1,1);
    p = 130.0*MOV(0.9,-1.1,1.7,0.8,-2.0+sin(0.1*iTime)+0.15*iTime);
    finalColor += bip1(uv, c+p) * vec3(1,1,1);
    p = 50.0*MOV(1.54,1.7,1.37,1.8,sin(0.1*iTime+7.0)+0.2*iTime);
    finalColor += bip2(uv,c+p) * red;
  }

  gl_FragColor = vec4( finalColor, 1.0 );
}