Sci-Fi Door Transition

HOW IT'S MADE

Sci-Fi Door Transition stacks 6 particle emitters, each with its own job. Techniques worth a look: collisions, particles stretched along their motion, keyframed parameters and post filters (bloom).

It loops seamlessly every 2.4 s, and 6 of its layers fire in bursts, so it pulses instead of flowing evenly. Start times are staggered from 0.5 s to 1.42 s, so the layers arrive one after another. To change its colour, select "Seam flash" in the studio and edit Colour A and Colour B. Size on the same layer sets how big its particles are. The colour swatches by the downloads recolour every layer at once.

Layers, in draw order

1. Door left, Door rightspriteA placed image. Extras: keyframed motion.
2. Lock lamp, Lock lampsprite / additiveA placed shape. Extras: keyframed motion.
3. Lamp glow, Lamp glowsprite / additiveA placed glow. Extras: keyframed motion.
4. Seam flashparticles / additiveA single particle at 0.5 s. Colour: pale orange.
5. Slam sparksparticles / additiveOne burst of 70 streaks along a line at 0.5 s. They fall under gravity and bounce when they hit something. Colour runs from white to orange over each life.
6. Steam, SteamparticlesOne burst of 9 smoke puffs from a disc at 0.52 s. They grow as they age, spin and slow down with drag. Colours range between blue and pale blue.
7. Steam, SteamparticlesOne burst of 9 smoke puffs from a disc at 1.42 s. They grow as they age, spin and slow down with drag. Colours range between blue and pale blue.