Turret Rotation

[Kronos]

I have a vehicle which has a turret base attached to it which can rotate locally around its y axis. A barrel is attached to this turret base that can move locally in the x axis but has an upper and lower limit on how far it can rotate. The vehicle will be travelling over uneven terrain.

 

My question is how can I make the gun turret point towards a certain point, eg an enemy vehicle or a specific point in space.

 

When i was using Blitz3d I used Deltayaw and Deltapitch for this which worked fine, but we do not have these functions in Leadwerks. I tried using the Deltapitch/yaw functions from minib3d but they don't work.

 

I have also been trying to use PointEntity but it appears to only work using global angles and not local ones. The turret base must only rotate around its own y axis and the barrel must only rotate around its own x axis.

 

Does anybody have any suggestions as to how I can achieve the result I am after?

[Josh]

There's an example like this in the Games/Driver script. The turret will keep pointing towards the camera direction, along it's own rotation axis.

[Kronos]

This seems to do the job for horizontal and vertical aiming.

 

 Local t:TVec3=TFormPoint(Vec3(0,0,0),enemytarget.chassis,chassis)

       dYaw = -ATan2(t.x,t.z)
dPitch =-ATan2(t.y, Sqr(t.x*t.x + t.z*t.z))

mRotate(turret1,0,CurveAngle(dYaw,entityrotation(turret1).y,10.0/AppSpeed()),0)
mRotate(barrel,CurveAngle(dPitch,entityrotation(barrel).x,10.0/AppSpeed()),0,0)

 

never really understood TFormpoint and TFormVector before but its becoming clearer.

 

Thanks Josh for pointing me in the right direction.(haha unintentional pun)