So i have a jet.

I make a force that moves it. but when i set it to 0 (this force) the jet stops, but it shouldn't, it should at least move with this force(because i didn't include drag force )

but i have no idea how to implement intertia there.

lets assume i got drag force (lets call it drag_force)

all forces are vectors with length of acting force and its direction in my case ;]

if this helps you here is the code

void __fastcall TVehicle::ProcessFrame() { Gather_All_INFO(); AIRLIERON_LEFT->Frame_tick(); AIRLIERON_RIGHT->Frame_tick(); ELEVATOR_LEFT->Frame_tick(); ELEVATOR_RIGHT->Frame_tick(); RUDDER_LEFT->Frame_tick(); RUDDER_RIGHT->Frame_tick(); //~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ double l; timin->stopTimer(); l = timin->getElapsedTime(); float dt = float(l); timin->startTimer(); if (dt <=0 ) return; float Front_force = Throttle_to_force( Throttle ); //thrust force val float Q = eGForce * mass; // gravity force val ThrustForce_vec = YPRangle.rf; //thrust force direction pos_from_plane_to_planet_center = vectorAB(pos, zero); GForce_vec = Normalize( pos_from_plane_to_planet_center ); //g force direction GForce_vec = vector_multiple(GForce_vec, Q); ThrustForce_vec = vector_multiple(ThrustForce_vec, Front_force); result_force = vectors_add(GForce_vec, ThrustForce_vec);//add forces //divide vector by float Acceleration = result_force / mass; // a = F / m dk = ( dt*dt ); accvel = Normalize( Acceleration ); Translation = vector_multiple(Acceleration, dk); Translation = vector_multiple(Translation, 0.50f); //(a * t^2 )/ 2 s = V * dt; accvel = vector_multiple(accvel, s); // V0 * t => convert it to vector Translation = vectors_add(Translation, accvel); //add vectors v0t + (at^2)/2 => s= v0t + at^2 / 2 t3dpoint rp = vectors_add(pos, Translation ); //move to new position if ( rp.y < 0 ) rp.y = 0.0f; pos = rp; // v = s / t V = n3ddistance(pos,old) / dt; // s = V * t v=s/t old = pos; //save position }

as you can see i use **result_force**

this need to be changed to intertia but how? ;x

like always i attach a video

by the way i have problems with calculation velocity properly but as soon i will deal with this problem and add some things i will make a new post ;P

**Edited by ___, 23 May 2013 - 01:55 PM.**