wrong in control direction

[tall_tree]

Pic_1

Pic_1.jpg (151.18 KiB) Viewed 42267 times

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.

Pic_2

Pic_2.jpg (48.13 KiB) Viewed 42272 times

Pic_3

Pic_3.jpg (74.31 KiB) Viewed 42265 times

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!

[Odin_KG]

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.

[tall_tree]

It's my fault.The API works well!

[Odin_KG]

It's my fault.The API works well!

Thank you for info! It is important for me.