The Speed property determines the random range of velocities that newly emit particles may have. It is measured in studs per second using a
DataType/NumberRange. The velocity is chosen upon emission, and is applied in the
ParticleEmitter/EmissionDirection. Negative speed values will cause particles to travel in reverse.
Below is an animation of two default
ParticleEmitters; the left has the default Speed of 5. The right one has the Speed range set to [20, 20], so its particles emit at a constant speed of 20.
ParticleEmitter/Drag will affect a particle’s speed over its lifetime. Changing Speed will not affect already existing particles - they will retain whatever speed they have already.
Creating a Particle Emitter from Scratch
This rather lengthy code sample shows how every property of a
ParticleEmitter can be set, including
DataType/ColorSequence properties. Below is how the ParticleEmitter should after every property is set. Try playing around with the different properties to customize how the effect looks!