GetVehicleRotationQuat, What is what?

GetVehicleRotationQuat, What is what? - Printable Version

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+--- Thread: GetVehicleRotationQuat, What is what? (/showthread.php?tid=368189)

GetVehicleRotationQuat, What is what? - milanosie - 12.08.2012

Quick question, never used GetVehicleRotationQuat before so want to be sure.

pawn Code:

GetVehicleRotationQuat(vehicleid, &Float:w, &Float:x, &Float:y, &Float:z)

What is the Float:w value in here?

Re: GetVehicleRotationQuat, What is what? - Vince - 12.08.2012

Not sure. You need to convert it to Euler angles if you want to get yaw, pitch, roll.

Re: GetVehicleRotationQuat, What is what? - milanosie - 12.08.2012

Quote:

Originally Posted by Vince

Not sure. You need to convert it to Euler angles if you want to get yaw, pitch, roll.

And what would I do to do that? Not really familiar with it,

Re: GetVehicleRotationQuat, What is what? - Babul - 12.08.2012

iam using it to check if a vehicles "horizon" got flipped:

pawn Code:

forward OnPlayerKeyStateChange(playerid, newkeys, oldkeys);                                                             public OnPlayerKeyStateChange(playerid, newkeys, oldkeys){
    if ((newkeys & KEY_CROUCH) && !(oldkeys & KEY_CROUCH))
    {
        if(IsPlayerInAnyVehicle(playerid))
        {
            new VehID,Float:VehPosX,Float:VehPosY,Float:VehPosZ,Float:VehSpdX,Float:VehSpdY,Float:VehSpdZ,Float:VehAngle,Float:VehSpeed,Float:Q[4];
            //new Float:heading,Float:attitide,Float:bank;
            VehID=GetPlayerVehicleID(playerid);
            GetVehiclePos(VehID,VehPosX,VehPosY,VehPosZ);
            GetVehicleZAngle(VehID,VehAngle);
            GetVehicleVelocity(VehID,VehSpdX,VehSpdY,VehSpdZ);
            VehSpeed=floatsqroot(VehSpdX*VehSpdX+VehSpdY*VehSpdY+VehSpdZ*VehSpdZ);
            GetVehicleRotationQuat(VehID,Q[0],Q[1],Q[2],Q[3]);
            new Float:sqw=Q[0]*Q[0];
            new Float:sqx=Q[1]*Q[1];
            new Float:sqy=Q[2]*Q[2];
            new Float:sqz=Q[3]*Q[3];
            new Float:bank=atan2(2*(Q[2]*Q[3]+Q[1]*Q[0]),-sqx-sqy+sqz+sqw);
            if(floatabs(bank)>160 && VehSpeed<0.01)
            {
                SetVehiclePos(VehID,VehPosX,VehPosY,VehPosZ);
                SetVehicleZAngle(VehID,VehAngle);
                GameTextForPlayer(playerid,"~w~vehicle ~g~fl~h~ip~h~pe~h~d",2000,4);
            }
            return 1;
        }
    }
    return 1;
}

it wont flip/stop you flying in a dodo while being flipped, due to the speed check - its' precision: one-hundert-percent. (iam not using 180 degrees but 160, in case my car stops on a hill, where it slips off anyways when moving too fast, thats why 160°. the speed check is not sensible enougn, multiply it by 10 for "less strict" behavior: speed-slipping slower than walking is ok?)

Re: GetVehicleRotationQuat, What is what? - milanosie - 12.08.2012

I am trying to check if a vehicle is driving on a hill, would this work while using this?

Re: GetVehicleRotationQuat, What is what? - Babul - 12.08.2012

yep. bank will be an angle of 0.0 when youre on flat ground, and when driving up a wall it will return 90.0, regardless if your car is tilted on its x/y axis, so you can detect if youre driving on a hanging curve (45 degrees) aswell. surprise yourself with a GameText showing the bank value in OnPlayerUpdate. enjoy!