OutlinePass色差问题

解决办法

https://github.com/mrdoob/three.js/issues/20241

关键是这个 GammaCorrectionShader

import {EffectComposer} from 'three/examples/jsm/postprocessing/EffectComposer.js';
import {RenderPass} from 'three/examples/jsm/postprocessing/RenderPass.js';
import {ShaderPass} from 'three/examples/jsm/postprocessing/ShaderPass.js';
import {OutlinePass} from 'three/examples/jsm/postprocessing/OutlinePass.js';
import {FXAAShader} from 'three/examples/jsm/shaders/FXAAShader.js';
import { GammaCorrectionShader } from 'three/examples/jsm/shaders/GammaCorrectionShader.js';

composer = new EffectComposer(renderer);
  const renderPass = new RenderPass(scene, camera);
  composer.addPass(renderPass);
  outlinePass = new OutlinePass(new THREE.Vector2(width, height), scene, camera);
  outlinePass.renderToScreen = true
  outlinePass.visibleEdgeColor.set('green');//模型描边颜色，默认白色
  outlinePass.edgeThickness = 4.0;//轮廓边缘描边厚度
  outlinePass.edgeStrength = 6.0;//边缘发光强度,数值大，更亮一些
  composer.addPass(outlinePass);
  effectFXAA = new ShaderPass(FXAAShader);
  effectFXAA.uniforms['resolution'].value.set(1 / width, 1 / height);
  composer.addPass(effectFXAA);
  const effectColorSpaceConversion = new ShaderPass( GammaCorrectionShader );
  composer.addPass( effectColorSpaceConversion );
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参考代码
https://jsfiddle.net/42juk3rq/

另外假如加了FXAAShader 锯齿还是比较严重 可以更新renderer的logarithmicDepthBuffer参数值，效果比较好。

renderer = new THREE.WebGLRenderer({
    antialias: true, //开启锯齿,
    logarithmicDepthBuffer: true,
  })
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