Vehicle Impulses?

#1 Been doing it like this for a few years now.. works ok.

%vel = %obj.getVelocity();
%vec = vectorDot(%vel, vectorNormalize(%vel));
%obj.applyImpulse(%obj.position, Vectorscale(VectorNormalize(%obj.getEyeVector()), %obj.getDataBlock().mass * 30));

Change the 30 to suit your needs or divide instead of multiply.

#2 Or you could just use the in built boost stuff ;) Ie, set up a button to set

$mvTriggerCount3++;

Then you have to set up the relevant datablocks variables, and voila, you have a boosting car :D

if you wanted them to move from some sort of explosion or something, then impulses are better, but I prefer this way for speed boosts, as you can define a new sound to play while boosting and energy drain in the datablocks and the engine does all the work for you.

#3 @Dylan: yes that's true, and I was doing it that way before. But I'm still undecided how it will 'feel' better so I was trying the applyImpulse too.

@Ralph: Thanks a lot. What's the dot product for though? :\

#4 Sorry, I didn't post all the code, oops. The first two lines are part of a limit. If the object is traveling to fast I do a return. This is because I want to limit, or used for a safetly net because over a certain velocity the engine crashes. Full code:

%vel = %obj.getVelocity();
      %vec = vectorDot(%vel, vectorNormalize(%vel));
      if(%vec > 75)
         return;

      %obj.applyImpulse(%obj.position, Vectorscale(Vectornormalize(%obj.getEyeVector()), %obj.getDataBlock().mass * 30));

#5 Ahhh that makes sense now :)
Thanks again, I was trying something very similar but It wasn't working, I'll try again and see what happens, maybe it was a typo or a wrong variable name or something.