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start the emitter in one direction it's right.then set the state to stop.change the direction,start the emitter to update,the emitter always repeat the fist time start direction
first:

second:

then set the state to stop.

I assume this question about the wrapper.
Magic_Stop (or MAGIC_STATE_STOP) stops and cleans up the emitter. Use MAGIC_STATE_VISIBLE to render the emitter without updating.