how to make a text become a particle, and that they are texture layers (emoji for example)? Because with the CC Particle System effect you can use an alpha source, but not define a texture layer, and with the CC Particle World effect you can customize a particle but not define an alpha source. Thanks for your help
That's not possible with these effects. What you want can only be doen with Particle Playground or third-party plug-ins like Trapcode Particular or Stardust using shape emitters and/ or sticky collisions based on the text.