Particle Anatomy - Emitters

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There is an invisible emitter at the center of every prim.

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The emitter will point at the top of its prim by default, (or it will rotate after every burst of particles)

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How to turn an Emitter OFF:

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    You must use llParticleSystem() to turn off an emitter.

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    Simply deleting the particle script is not enough!

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    The default setting for an emitter is off, so all you need
    to do is send an empty list of to llParticleSystem(), like this:

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How to turn an Emitter ON:

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    You must override the default setting for PATTERN to turn on an Emitter.  

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Pattern types are DROPµÎÂä, ANGLE½Ç, ANGLE_CONE ׶and EXPLODE.±¬Õ¨  For example, the absolute minimum you need to start creating particles is this script:

default {
        state_entry() {
            llParticleSystem(  [
                    PSYS_SRC_PATTERN,  PSYS_SRC_PATTERN_EXPLODE
                ]  );
        }
}