I wrote a plugin which draws the B747-400. The Model Object (.obj) has been created from Plane Maker by taking the .acf from the Laminar Research base folder.
I would like to animate the aircraft by deploying the gear, firing the engines, turning on the landing lights, moving flaps and so on. For doing this, I used the XPLMInstance Library and modified the dataref "im/flightmodel2/gear/deploy_ratio" with the method XPLMInstanceSetPosition but it didn't work.
I include here my plugin and the .obj generated from Plane Maker for more details.
Thanks for the attention.