Hello, i cant figure out a good way to measure how much a object rotates around his own axis.

I tryed with reading the object.roll parameter and divide it by 360 but it didn't work out right..

There must be an easy way to do this..

All help is welcome..

measure the angle difference between now and the last frame(store in variable)
now you can calculate the rpm with time_step

Thanks for pointing me in the right direction but can you give me a sample code?

I tryed but something go's wrong, i use gamestudio A7 and it counts roll from 0 to 180 and then from -180 to 0 again. This is fifferent than what is described in the manuel i use. This is the reason why it didn't work for me.

Now i need to figure out how to fix it.

then you have to check if the value jumps from 180 to -180 and calculate your distance

How can i easy check if the value jumps from '-' to '+' ?

Its my firsttime i program this.

some other question:
in which way do you rotate your object?
maybe you can get your rpm without measuring it...

Well its a car wheel, so i aply the motor torque on the wheels. Then i want to measure the wheel rotation so i know how the motor rpm's are influenced

did you create the code yourself or do you use the physic engine?