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Collision avoidance

by gamer · in Torque Game Engine · 09/17/2007 (6:50 pm) · 3 replies

I need to simulate crowd/mob behavior where people might run into each other, get stuck on the wall/curb/other obstacle. What's the best way of doing this kind of collision avoidance?
any advise is welcome.
thanks
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Torque 3D Owner Caylo Gypsyblood
#1
09/17/2007 (7:32 pm)
Inside your PLAYER::onImpact(%this, %obj, %collidedObject, %vec, %vecLen) function do something like this...

%HITCLASS = %collidedObject.getclassname();
     %HITOBJ   = %collidedObject;
//!NO! BOUNCE OFF for.......
 if ( %HITCLASS $= "TerrainBlock") return;
 if ( %HITCLASS $= "RigidShape")   return;
 if ( %HITCLASS $= "Player" )      return;
 
  //Figure in a BOUNCE OFF direction 
   %kickBack = -1500 ; // How much to BOUNCE OFF  might try to scale with%vecLen
   %dir = %obj.getForwardVector();
   %position = getWords(%obj.getTransform(), 0, 2);
   %x1 = getWord(%dir, 0) * %kickBack;
   %y1 = getWord(%dir, 1) * %kickBack;
   %z1 = getWord(%dir, 2) * %kickBack;
   %impulseVec = %x1 SPC %y1 SPC %z1;
   %obj.applyImpulse(%position, %impulseVec);


You can setup situation for any number of %HITCLASS objects, or even an specific %HITOBJ.

Torque Owner gamer
#2
09/17/2007 (9:17 pm)
Great source, thanks!
this bounces when they collide, what about avoid collision?

Torque 3D Owner Caylo Gypsyblood
#3
09/17/2007 (9:24 pm)
You mean, as in NO collision at all? There is a resource here that allows one to turn off collision mesh by script.

If you need AI that is smart enough to NOT run into things, thats a more difficult problem...

EDIT:

Ok, here is a good start on AI script/programing;

www.garagegames.com/index.php?sec=mg&mod=resource&page=view&qid=3782

www.garagegames.com/index.php?sec=mg&mod=resource&page=view&qid=6773

www.garagegames.com/index.php?sec=mg&mod=resource&page=view&qid=6742

You would need to study the above, and fit it into what you need, but most of it is already there for you.