Andy

I'm having a play with reacTIVision but I can't seem to figure out how to discern the direction of object rotation. I am not particularly interested in the angle, more whether the object is being rotated clockwise or anti clockwise.

In the main this is very easy using the change object but problems occur when the angle changes from 360 to 1 or vice versa. I've come up with a few very messy work arounds but I'm sure there must be a very easy way to do this that I am just not seeing.

I'm having a play with reacTIVision but I can't seem to figure out how to discern the direction of object rotation. I am not particularly interested in the angle, more whether the object is being rotated clockwise or anti clockwise. 

reavtivision-rotation-direction

you can try with a modulo 360, and then look at the rest of the division : soustract two successive values to get the signe.

Be careful, the angle output is in radians with the reactivison max object.

you can try with a modulo 360, and then look at the rest of the division : soustract two successive values to get the signe.
Be careful, the angle output is in radians with the reactivison max object.

I don't know that this is an improvement, but I took the approach of

treating rotation like an endless rotary encoder. movement to the left

will subtract a 'tick' from an accumulator, movement to the right will

add a 'tick'. The problem I find with this patch is that it isn't

very responsive to fast rotations - I guess I could look at the size

of the increase in angle and adjust the number of ticks counted

accordingly. Anyway, here's the patch - hope it helps. If anyone else

has suggestions on this topics, I'd be all ears....

> I'm having a play with reacTIVision but I can't seem to figure out how to discern the direction of object rotation. I am not particularly interested in the angle, more whether the object is being rotated clockwise or anti clockwise.

> In the main this is very easy using the change object but problems occur when the angle changes from 360 to 1 or vice versa. I've come up with a few very messy work arounds but I'm sure there must be a very easy way to do this that I am just not seeing.

I don't know that this is an improvement, but I took the approach of
treating rotation like an endless rotary encoder. movement to the left
will subtract a 'tick' from an accumulator, movement to the right will
add a 'tick'.  The problem I find with this patch is that it isn't
very responsive to fast rotations - I guess I could look at the size
of the increase in angle and adjust the number of ticks counted
accordingly. Anyway, here's the patch - hope it helps. If anyone else
has suggestions on this topics, I'd be all ears....

On 10/3/07, Andy Brennan  wrote:
>
> Hi guys,
>
> I'm having a play with reacTIVision but I can't seem to figure out how to discern the direction of object rotation. I am not particularly interested in the angle, more whether the object is being rotated clockwise or anti clockwise.
>
> In the main this is very easy using the change object but problems occur when the angle changes from 360 to 1 or vice versa. I've come up with a few very messy work arounds but I'm sure there must be a very easy way to do this that I am just not seeing.
>
> Can anyone help?
>
> Cheers
>
> Andy
>


> In the main this is very easy using the change object but problems

> occur when the angle changes from 360 to 1 or vice versa. I've come

> up with a few very messy work arounds but I'm sure there must be a

> very easy way to do this that I am just not seeing.

Just watch out the big jumps, and interpret them as the opposite:

Andy Brennan schrieb:
> In the main this is very easy using the change object but problems
> occur when the angle changes from 360 to 1 or vice versa. I've come
> up with a few very messy work arounds but I'm sure there must be a
> very easy way to do this that I am just not seeing.

-- 
Stefan Tiedje------------x-------
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reavTIVision rotation direction