Measuring a wheel rotations???

I'll try keep it simple,

I have a bike wheel and I want to add a sound effect for each 36degrees of rotation but I cant find a way to measure the wheel rotations, or how to distinguish it to add events. everything is physics in the game.

any help much appreciated <img src="smileys/smiley4.gif" border="0" align="middle" />

Even though its Physics...The 'Angle' of the Object wheel would be still registered as normal..

So you could place a Variable or two on the wheel that for example is

something like...

'Wheel_initial_Angle'

&

'Wheel_updated_Angle'

or similiar

Do a Every tick function

Every Tick-> set 'Wheel_initial_Angle' to Wheel Angle

Then then compare the Values every x seconds..dependant on the maximum required level of sensitivity..say every 0.5 secs.would need testing of course

{System->Every 0.5s->

Compare two values ->

[Wheel_updated_Angle > (greater than)Wheel_initial_Angle Action Play your sfx or anything else.. or you could set it up any number of ways Boolean Variable" Wheel Rotate 36 degrees" Is 'Wheel_updated_Angle 36 degrees greater than 'Wheel_Initial_Angle' -> Set Boolean Variable" Wheel Rotate 36 degrees" TRUE -> FIRE SFX -> Reset variables..specifically up date the Initial and updated variables There would be plenty of ways to do what you what its just a matter of finding the BEST idea for you This may take considerable testing phase ..but you would learn alot..:) work for you? first value would be the WHEEL angle and

Even though its Physics...The 'Angle' of the Object wheel would be still registered as normal..

So you could place a Variable or two on the wheel that for example is

something like...

'Wheel_initial_Angle'

&

'Wheel_updated_Angle'

or similiar

Do a Every tick function

Every Tick-> set 'Wheel_initial_Angle' to Wheel Angle

Then then compare the Values every x seconds..dependant on the maximum required level of sensitivity..say every 0.5 secs.would need testing of course

{System->Every 0.5s->

Compare two values ->

[Wheel_updated_Angle > (greater than)Wheel_initial_Angle > > Action Play your sfx or anything else.. > > or > > you could set it up any number of ways > > Boolean Variable" Wheel Rotate 36 degrees" > > Is 'Wheel_updated_Angle 36 degrees greater than 'Wheel_Initial_Angle' > -> > Set Boolean Variable" Wheel Rotate 36 degrees" TRUE > -> FIRE SFX > -> Reset variables..specifically up date the Initial and updated variables > > There would be plenty of ways to do what you what > > its just a matter of finding the BEST idea for you > > This may take considerable testing phase ..but you would learn alot..:) > > work for you? > first value would be the WHEEL angle and Hi thanks for your reply, your ideas sound interesting and I am going to definitely test them I figured out a way last night, its very basic and mundane but does the trick I pinned invisible circles to every spoke of the wheel and 1 circle to the bike frame and set a sound for ever collision between the frame circle and spoke circle, I got the desired effect of a slow ticking of the chain when rolling slow and a fast ticking when up to speed. Time to try your ideas so I get to grips with more of the maths and physics equations. It will surely shorten my code atleast.

Yeah, always avoid invisible objects when you can. You can do what you are after with just a bit of math ;)