getLinearVelocity() not working?

Game Engine Game Engine Support and Discussion
1

For some reason the getLinearVelocity() is not working… the way I want it to. I think it may be my this < this(): but idk…

# get the controller
cont = GameLogic.getCurrentController()
own = cont.getOwner()

# get the object actuator named act
actMotion = cont.getActuator("act")

# get velocity
speed = own.getLinearVelocity()
equal = 2

if speed &gt; 1():
    own.linv = equal
2

.getLinearVelocity() get an array (or list?) of 3 elements, not only 1 (separated XYZ velocities).

In other words you should do:

totalSpeed= sqrt (pow(speed[0],2)+pow(speed[1],2)+pow(speed[2],2))

if totalspeed<1:
…

Or something like that.

sqrt and pow are used to calculate trigonometrically the speed.

3

sqrt means square root, and pow means power (number, exponent). Square roots and powers are only basic algebra, not trig. and that’s just a simple formula, so don’t feel overwhelmed.

4

Remember to import math module for using those functions!
You can use ** for replacing pow without the math module in Python.

5

I’ve used get linear velocity before, i don’t need math. I just need to see if the y value is higher than a certain value.

6

oh, well you should have mentioned the Y value part.

# get the controller
cont = GameLogic.getCurrentController()
own = cont.getOwner()

# get the object actuator named act
actMotion = cont.getActuator("act")

# get velocity
speed = own.getLinearVelocity()
equal = 2

if speed[1] &gt; :
    own.linv = equal

there. I changed speed to speed[1], and took away the parentheses, because that is not a function.

7

I’ll try that.