Thank you so much for your response,
i am so sorry because of my stupid question again, but i am a bit confused.according to the tutorials for development https://dev.px4.io/en/setup/building_px4.html => in terminal : $make posix jmavsim , then i saw the 3d space, even i chould follow correctly the tutorials for write application and i did run "px4_simple_app".
BUT, my question is here; if i want to see my own controller's result that i have designed in Matlab , lets consider convert it to the c++ in correct mode, so where i should add this cpp and header file and compile up to influence on the simulation.
if i will change the file in this directory src/modules/mc_att_control, might i seen my desired result that i am seeking for?
thank you so much for your time.