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The black lines are the directions I set the emitter by using "Magic_SetEmitterDirection".I get directions of NO.1 and NO.3 by using "Magic_GetEmitterDirection". They change all the time and are not same with the direction I give.

The emitter will turn to the direction as in the Magic Particles software.i.e the emitter in the Pic_2 will turn to -Z at last.
Waiting for your answer!

Unfortunately, I understood a little.

They change all the time and are not same with the direction I give.

Currently API allows to change the axes directions. Therefore quaternion is converted to the "API format" during Magic_SetEmitterDirection and quaternion is converted to the back during Magic_GetEmitterDirection. But the converting influences the result slightly.

It's my fault.The API works well!

It's my fault.The API works well!

Thank you for info! It is important for me.