Vehicle Damage system Assistance please

function VehicleData::onImpact(%data, %vehicleObject, %collidedObject, %vec, %vecLen, %HitBoxNum)
{
   if (%vehicleObject == %collidedObject) 
      return;

   //Our car calculations
   %objMass = %data.mass;
   %objVelocity = %vehicleObject.getVelocity();
   %objSpeed = vectorLen(%objVelocity);
   %objForce = %objSpeed * %objMass;
   %speedDamageScale = 0.025;
   
   if (%collidedObject.getType() & $TypeMasks::PlayerObjectType)
   {
      %objDamageVar = 0;
      %colDamageVar = vectorLen(%objForce) * %speedDamageScale;
      %objDamageType = 0;
      %colDamageType = 11;
   }
   else if (%collidedObject.getType() & $TypeMasks::InteriorObjectType)
   {
      %objDamageVar = %objForce * %speedDamageScale;
      %colDamageVar = 0;
      %objDamageType = 13;
      %colDamageType = 0;
   }
   else if (%collidedObject.getType() & $TypeMasks::TerrainObjectType)
   {
      %zval = getWord( %vec, 2 );
      if(%zval > 12)
      {
         %objForce = %objSpeed * %objMass;
         %objDamageVar = %objForce * %speedDamageScale;
         %colDamageVar = 0;
         %objDamageType = 12;
         %colDamageType = 0;
      }
      else
      {
         %objForce = %objSpeed * %objMass;
         %objDamageVar = 0;
         %colDamageVar = 0;
         %objDamageType = 0;
         %colDamageType = 0;
      }
   }
   else if (%collidedObject.getType() & $TypeMasks::VehicleObjectType)
   {
      //Collided object calculations
      %colMass = %collidedObject.getDataBlock().mass;
      %colVelocity = %collidedObject.getVelocity();
      %colSpeed = vectorLen(%colVelocity);
      %colForce = %colSpeed * %colMass;
      
      %objSub = (%objMass/(%objMass + %colMass)) * %objVelocity;
      %colSub = (%colMass/(%objMass + %colMass)) * %colVelocity;
      
      %impactVelocity = VectorAdd(%objSub, %colSub);
      
      %impactSpeed = vectorLen(%impactVelocity);
       
      %objImpactForce = (%objSpeed/%impactSpeed) * %objForce;
      %colImpactForce = (%colSpeed/%impactSpeed) * %colForce;

      %colDamageVar = %objImpactForce * %speedDamageScale;
      %objDamageVar = %colImpactForce * %speedDamageScale;
      
      %objDamageType = 15;
      %colDamageType = 15;
   }
   else if (%collidedObject.getType() & $TypeMasks::RigidShapeObjectType)
   {
      //Collided object calculations
      %colVelocity = %collidedObject.getVelocity();
      %colSpeed = vectorLen(%colVelocity);
      %colForce = %colVelocity * %collidedObject.getDataBlock().mass;

      %objToCol = (%objForce + (%objForce - %colForce)) * %speedDamageScale;
      %colToObj = (%colForce + (%colForce - %objForce)) * %speedDamageScale;

      %objDamageVar = %colToObj;
      %colDamageVar = %objToCol;

      %objDamageType = 15;
      %colDamageType = 15;
   }
   else
   {
      %objDamageVar = vectorLen(%objForce) * %speedDamageScale;
      %colDamageVar = 0;
      %objDamageType = 14;
      %colDamageType = 14;
   }


   if(%objDamageVar > 0)
      %vehicleObject.damage(%collidedObject, %pos, %objDamageVar, %objDamageType, %HitBoxNum);
   if(%colDamageVar > 0)
      %collidedObject.damage(%vehicleObject, %pos, %colDamageVar, %colDamageType, %HitBoxNum);

   // associated "crash" sounds
   if(%vecLen > %data.hardImpactSpeed)
      %vehicleObject.playAudio(0, %data.hardImpactSound);
   else if(%vecLen > %data.softImpactSpeed)
      %vehicleObject.playAudio(0, %data.softImpactSound);
}