Air Control

Owke, i've struggled with this subject very long, since i needed it for my bunny game,
and now i found out, i will share it with the rest of the world!

so here we go,
first open up player.h and find the lines

ParticleEmitterData* splashEmitterList[NUM_SPLASH_EMITTERS];
   S32 splashEmitterIDList[NUM_SPLASH_EMITTERS];

inside the struct PlayerData: public ShapeBaseData
then after that, or somewhere else in there add the following line:

F32 airControl;

Ok, thats enough for player.h,
lets open player.cc and add some code!
Inside PlayerData::PlayerData() after

groundImpactShakeDuration = 1.0;
   groundImpactShakeFalloff = 10.0;

add

airControl=0.0f;

then look for void PlayerData::initPersistFields() and after

addField("groundImpactShakeFalloff",   TypeF32,       Offset(groundImpactShakeFalloff,    PlayerData));

add

addField("airControl", TypeF32, Offset(airControl,PlayerData));

then we need to make sure that it is sent and retreived on multiplayer connections so find void PlayerData::packData(BitStream* stream) and after

stream->write(groundImpactShakeDuration);
   stream->write(groundImpactShakeFalloff);

add

stream->write(airControl);

then find void PlayerData::unpackData(BitStream* stream) and after

stream->read(&groundImpactShakeDuration);
   stream->read(&groundImpactShakeFalloff);

add

stream->read(&airControl);

ok now we got the variable, lets do some real work!
find void Player::updateMove(const Move* move)
and replace

else
      mContactTimer++;

with this:

else {
      mContactTimer++;
	  //--- by DJMystic ---
      if (!inLiquid && mDataBlock->airControl > 0.0f) {
		  VectorF pv;
		  pv = moveVec;

		  F32 pvl = pv.len();

		  if (pvl)
			 pv *= moveSpeed / pvl;
		  VectorF runAcc = pv - acc;
		  runAcc.z = 0;
		  runAcc.x = runAcc.x * mDataBlock->airControl;
		  runAcc.y = runAcc.y * mDataBlock->airControl;
		  F32 runSpeed = runAcc.len();

		  F32 maxAcc = (mDataBlock->runForce / mMass) * TickSec * mDataBlock->airControl;
		  if (runSpeed > maxAcc)
			 runAcc *= maxAcc / runSpeed;
		  acc += runAcc;
	  }
	  //--- end by DJMystic ---
   }

then all we need to do is tweak one little thing to make sure the player will still fall so find (still in that same function)

if (mBuoyancy > 1.0 || !mVelocity.isZero() || !runSurface)

and change it to

if (mBuoyancy > 1.0 || !runSurface)

(Yes, i have removed the || !mVelocity.isZero() part :P)

then we need to define how much the player should get control in the air, so open up fps/server/scripts/player.cs and in

datablock PlayerData(LightMaleHumanArmor)

somewhere in the end add

airControl=0.3;

(0.3 works fine with me, 0 means NO air control, 1 means equal air control as ground control)

then you should be able to steer in mid-air :)

YEAH!

if someone finds bugs or errors in this code, please inform me,
if you think i've done something wrong, please inform me too :P

feedback is a must!