viewerparticle.js

this.plane = new PlaneBufferGeometry(1, 1, 1, 1);
this.viewerMaterial = new RawShaderMaterial({
  blending: AdditiveBlending,
  vertexShader: `
  precision highp float;
  uniform mat4 modelViewMatrix;
  uniform mat4 projectionMatrix;

  attribute vec2 uv;
  attribute vec3 position;

  varying vec2 vUv;

  void main() {
    vUv = uv;
    gl_Position = projectionMatrix * modelViewMatrix * vec4(position, 1.0);
  }
  `,
  fragmentShader: `precision highp float;
  uniform sampler2D uTexture;
  uniform float uTime;
  varying vec2 vUv;

  void main() {
    gl_FragColor = texture2D(uTexture, vUv);
    gl_FragColor.a *= 0.07;
    gl_FragColor.a *= 1.0 + ((sin(uTime * 0.3 + vUv.x * 14.0) + 1.0) / 2.0) * 2.0;
  }
  `,
  transparent: true,
  depthWrite: false,
  uniforms: {
    uTexture: { value: this.buffer.target },
    uTime: { value: 0 },
  },
});
this.viewer = new Mesh(this.plane, this.viewerMaterial);

this.add(this.viewer);