Waypoint Stop-Turn-Hold Script

[Sertica 18]

I need to have a helicopter gunship move to a waypoint, then turn to face a specific direction and engage with turret without vehicle motion.  I'm stuck on how to block pilot engagement flight so the gunner can fire from a static position.  I tried hold waypoint with setdir in statement, but it never happens, presumably because hold waypoints never complete.

[johnnyboy 3797]

For stopping the heli, you can use a Talk waypoint (which does nothing), and put this in its activation code box:

this lockWp true;

The helicopter will now not move to next waypoint until you unlock the waypoint like this:

group heli1 lockWP false;

The above assumes your helicopter is named heli1.  What you are trying to do is difficult with helicopter AI.  The most sure way to get the heli in the exact spot is to pre-record a heli flight and play it back based on a trigger or script when you want it to happen, using:

 

BIS_fnc_unitCapture

BIS_fnc_unitPlay

 

 

[Sertica 18]

24 minutes ago, johnnyboy said:

What you are trying to do is difficult with helicopter AI.  The most sure way to get the heli in the exact spot is to pre-record a heli flight and play it back based on a trigger or script when you want it to happen, using:

It's for a mod that makes ai drivers and gunners play like human player.  All actions are run time generated, so I would have to generate the play data, which will look wonky because it is not going through physics calcs.  😬

[Sertica 18]

Code for the turn animation:

#define FRAMES_PS 25
#define DEGREES_PS 60
genTurnAnim = {
	_targetPos = param[0,nil,[]];
	_gunshipPos = getPos gunship;
	_gunshipDir = vectorDir gunship;
	_gunshipUp = vectorUp gunship;
	_gunshipVel = velocity gunship;
	// angle of turn
	_targetVector = _targetPos vectorDiff _gunshipPos;
	_vecDotProduct = [_gunshipDir select 0, _gunshipDir select 1, 0] vectorDotProduct [_targetVector select 0, _targetVector select 1];
	_vecMag = vectorMagnitude _gunshipDir;
	_tgtVecMag = vectorMagnitude _targetVector;
	_vecMagProduct = _vecMag * _tgtVecMag;
	_turnAngleAbs =  acos (_vecDotProduct / _vecMagProduct);
	// angular direction of turn
	_zCrossProduct = (_gunshipDir select 0) * (_targetVector select 1) - (_gunshipDir select 1) * (_targetVector select 0);
	_angDirSign = _zCrossProduct / (abs _zCrossProduct); // vec1 counter-clockwise of vec2 -> counter-clockwise direction
	// generate vectors
	_animTimeSec = (floor _turnAngleAbs) / DEGREES_PS;
	_frames = _animTimeSec * FRAMES_PS;
	_frameTimeDelta = _animTimeSec / _frames;
	_angPerFrame = _turnAngleAbs / _frames;
	_motionRecord = []; // 0:time s, 1:position, 2:dir, 3:up, 4:velocity
	_motionRecord resize _frames;
	_frameTime = 0;
	_angle = _angPerFrame * _angDirSign;
	for "_idx" from 0 to _frames-1 step 1 do {
		_frameArray = [nil,nil,nil,nil,nil];
		// frame time
		_frameTime = _frameTime + _frameTimeDelta;
		_frameArray set[0,_frameTime];
		// position
		_frameArray set[1,_gunshipPos];
		// direction vector
		_frameDirX = (_gunshipDir select 0) * (cos _angle) - (_gunshipDir select 1) * (sin _angle);
		_frameDirY = (_gunshipDir select 0) * (sin _angle) + (_gunshipDir select 1) * (cos _angle);
		_frameArray set[2,[_frameDirX,_frameDirY,0]];
		// up vector
		_frameUpX = (_gunshipUp select 0) * (cos _angle) - (_gunshipUp select 1) * (sin _angle);
		_frameUpY = (_gunshipUp select 0) * (sin _angle) + (_gunshipUp select 1) * (cos _angle);
		_frameArray set[3,[_frameUpX,_frameUpY,_gunshipUp select 2]];
		// velocity vector
		_frameArray set[4,_gunshipVel];
		_motionRecord set[_idx,_frameArray];
		_angle = _angle + _angPerFrame * _angDirSign;
	};
	_motionRecord
};

Now I can put that animation in completion statement for a MOVE waypoint and test fire from static position.

[Sertica 18]

The returned data format is broken for unitPlay, but I have not determined what the problem is. 🤔

Quote

18:47:16 Error in expression <ityTransformation];
};

_stepProgress = linearConversion [_currentTime,_nextTime>
18:47:16   Error position: <linearConversion [_currentTime,_nextTime>
18:47:16   Error Type Any, expected Number
18:47:16 File A3\functions_f\scenes\fn_UnitPlay.sqf..., line 114

 

[Sertica 18]

I had to truncate the nulls out of  _motionRecord.  The above code now works, except the rotation amount seems to be 2x.  I'll check the math and edit that post later.

[Sertica 18]

This seems to prevent the pilot from moving when I reveal targets:

gunshipD disableAI "TARGET";

A "MOVE" way point is fine with that set.