Lorenz94 6 Posted June 16, 2019 Hello guys, I'm trying to draw on screen an icon that represents the "path" a projectile will follow once fired from a moving chopper (NO BALLISTIC!). This function appears to be called "G/C Steering", and from what I can understand, is the drift caused by g-force on projectiles fired from a moving object. To be more clear, you can have a look at this HUD picture (top most write). I've done some tests, and maybe I am close to the final code, but I have no more ideas, so I would like some hints from the forum: Spoiler //Tests conducted on a "RHS_MELB_AH6M" helicopter addMissionEventHandler ["Draw3D", { _aircraft = objectParent player; _camera = AGLtoASL positionCameraToWorld [0,0.09,1000]; _rocket = AGLtoASL (_aircraft modelToWorld [0,0,-1.275]); //Rocket launcher height in modelSpace _diff = _camera vectorDiff _rocket; _gforce = (velocity _aircraft) vectorAdd [0,0,9.81]; _xhair = (_diff vectorAdd _gforce) vectorAdd (getPosATL _aircraft); drawIcon3D ["", [1,0,0,1], ASLToAGL _xhair, 0, 0, 0, "•", 0, 0.0405, "PuristaBold"]; }]; As always, thank you. Share this post Link to post Share on other sites
pierremgi 4852 Posted June 16, 2019 I'm not sure the Arma engine calculates the Coriolis effect (C) for the trajectory (depending on direction, latitude,... and asset movements)... Tell me if I'm wrong and then describe the parameters used in this calculation. Share this post Link to post Share on other sites
Lorenz94 6 Posted June 16, 2019 26 minutes ago, pierremgi said: I'm not sure the Arma engine calculates the Coriolis effect (C) for the trajectory (depending on direction, latitude,... and asset movements)... Tell me if I'm wrong and then describe the parameters used in this calculation. Hello pierremgi, from what I remember, even the ACE team dropped the idea of implementing the Coriolis effect, and since that developing team is far more experienced than me (lol) I think that part is negligible. Regarding what I tried to do, in the first place I calculated the average position between the camera' sight and the position of the rocket launcher, so that perspective should be ok. Then I added the gforce and what lacked to have the icon correctly displayed was to add the current position of the aircraft. I also tried to "scale" these vectors, but the icon doesn't move perfectly where it should, so probably I'm missing something little! I'm not very good at physics, sorry ;( Share this post Link to post Share on other sites
Dedmen 2700 Posted June 18, 2019 On 6/16/2019 at 10:55 PM, pierremgi said: I'm not sure the Arma engine calculates the Coriolis effect (C) for the trajectory doesn't. On 6/16/2019 at 11:31 PM, Lorenz94 said: even the ACE team dropped the idea of implementing the Coriolis effect No we didn't. It's implemented. Share this post Link to post Share on other sites