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--  Function......... : updateMotor
--  Author........... : 
--  Description...... : 
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function Car.updateMotor ( )
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	local o = this.getObject ( )

    if ( this.bGoFront ( ) )
    then
        this.nMotorSpeed (   2500 )
        this.nMotorPower ( 150000 )
        
    elseif ( this.bGoBack ( ) )
    then
        local vx, vy, vz = dynamics.getLinearVelocity ( o, object.kLocalSpace )
        
        if ( vz > -0.5 )
        then
            this.nMotorSpeed (  -1000 )
            this.nMotorPower (  50000 )
        else
            this.nMotorSpeed ( 0 )-- -1500 )
            this.nMotorPower ( 0 )--150000 )
            dynamics.setAngularVelocity ( this.hWheelBL ( ), 0, 0, 0, object.kGlobalSpace )
            dynamics.setAngularVelocity ( this.hWheelBR ( ), 0, 0, 0, object.kGlobalSpace )
            dynamics.setAngularVelocity ( this.hWheelFL ( ), 0, 0, 0, object.kGlobalSpace )
            dynamics.setAngularVelocity ( this.hWheelFR ( ), 0, 0, 0, object.kGlobalSpace )
        end
    else                 
        this.nMotorSpeed ( 0 )
        this.nMotorPower ( 0 )
    end

    
    local oSpeed    = dynamics.getLinearSpeed ( o )
    local speed     = this.nMotorSpeed ( )
    local power     = this.nMotorPower ( )
    local bFactor   = 0.5 - math.min ( 40, oSpeed ) / 40 * 0.5
    local lFactor    
    local rFactor    
    
    if      ( this.bTurnLeft  ( ) ) then lFactor = 0.5 rFactor = 1.5
    elseif  ( this.bTurnRight ( ) ) then lFactor = 1.5 rFactor = 0.5
    else                                 lFactor = 1.0 rFactor = 1.0 bFactor = 0.5
    end
    
    dynamics.setHinge2JointAxis2MotorSpeedLimit     ( o, "Wheel1", speed * 1.0 )
    dynamics.setHinge2JointAxis2MotorSpeedLimit     ( o, "Wheel2", speed * 1.0 )
    dynamics.setHinge2JointAxis2MotorSpeedLimit     ( o, "Wheel3", speed * lFactor )
    dynamics.setHinge2JointAxis2MotorSpeedLimit     ( o, "Wheel4", speed * rFactor )
    dynamics.setHinge2JointAxis2MotorAcceleration   ( o, "Wheel1", power * bFactor )
    dynamics.setHinge2JointAxis2MotorAcceleration   ( o, "Wheel2", power * bFactor )
    dynamics.setHinge2JointAxis2MotorAcceleration   ( o, "Wheel3", power * lFactor )
    dynamics.setHinge2JointAxis2MotorAcceleration   ( o, "Wheel4", power * rFactor )
	
    
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end
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