Here is a Dr. Strange inspired portal I created with particles. All that is needed to to press bake all dynamics to bake the particles. (Messing with the size of the portal messes up the sim by the way.) To change when it starts, change the particle system start and offset the first keyframes in the dope sheet.
Это самый Лучший портал, который я когда либо видел!!!! Благодарю)))