DistanceBasedFog.js

// Generated by CoffeeScript 2.5.1
var DistanceBasedFog;

import * as THREE from "three";

DistanceBasedFog = class DistanceBasedFog {
  constructor(options) {
    this.view = new THREE.Vector3();
    this.farnear = new THREE.Vector2();
    this.color = new THREE.Vector4();
    return;
  }

  addShaderToMaterial(material) {
    var _this;
    _this = this;
    material.onBeforeCompile = function(shader) {
      shader.uniforms.u_viewPos = {
        value: _this.view
      };
      shader.uniforms.u_fogColor = {
        value: _this.color
      };
      shader.uniforms.u_farnear = {
        value: _this.farnear
      };
      shader.fragmentShader = ["uniform vec3 u_viewPos;", "uniform vec4 u_fogColor;", "uniform vec2 u_farnear;", shader.fragmentShader].join("\n");
      shader.fragmentShader = shader.fragmentShader.replace("gl_FragColor = vec4( outgoingLight, diffuseColor.a );", ["float dist=length(u_viewPos-vViewPosition);", "float fogAmount = smoothstep(u_farnear.x, u_farnear.y, dist);", "gl_FragColor = vec4( outgoingLight, diffuseColor.a );", "gl_FragColor = mix(gl_FragColor,u_fogColor,max(0.1,fogAmount));"].join("\n"));
      shader.vertexShader = ["uniform float time;", "uniform mat4 u_worldView;", "attribute vec4 a_position;", shader.vertexShader].join("\n");
      shader.vertexShader = shader.vertexShader.replace("#include <fog_vertex>", ["vec4 vViewPosition4 = modelViewMatrix * vec4(position, 1);", "vViewPosition = vViewPosition4.xyz;"].join("\n"));
    };
  }

};

export {
  DistanceBasedFog
};