uniform vec3 diffuse;
uniform float opacity;
uniform float time; // added time uniform

uniform float dashSize;
uniform float gapSize;
uniform float dotSize;
varying float vLineDistance;

void main() {
  float totalSize = dashSize + gapSize;
  float modulo =
      mod(vLineDistance - time, totalSize); // time added to vLineDistance
  float dotDistance = dashSize + (gapSize * .5) - (dotSize * .5);

  if (modulo > dashSize && mod(modulo, dotDistance) > dotSize) {
    discard;
  }

  gl_FragColor = vec4(diffuse, opacity);
}