There are the following steps to create visible particles:
- Particle system: extra>Particles>Create Part System
- Particle type: Create Particle
- Tips: particles are created randomly between maxsize and minsize, size increment can be positive or negative (should be kept low for a nice effect)
- Additional: you can set Particle Color, Life, Speed, Gravity and Secondary - just play around with it
- Particle emitter: Create Emitter
- the 4 coordinates are simply the size of your emitter (whole room: xmin: 0, xmax: room_width, ymin: 0, ymax: room_height)
- Show particles: Burst from Emitter/Stream from Emitter
- set the id and number (negative numbers: -5 means a 1/5-chance to spawn a particle)
- burst: release a load of particles
- stream: this number of particles will be spawned each step until the emitter is destroyed
Use Destroy actions to destroy emitters or part systems.