[x3d-public] value_changed event if value does not change

[Leonard Daly]

Andreas,

> Any takers for below ?
>
> To sharpen the question a bit: Would any (known) scene break if 
> interpolators would not generate a value_changed event if the key 
> values stayed the same ? As in the central intervals of keyValue='0 1 
> 1 1 1 0' ?

The only situation I can think of is someone using an interpolator as a 
timed locking switch. For example, a motion sensor that leaves a light 
on in a room for N seconds after the last motion detected. If the value 
of "1" is light on, "0" for off, and the time intervals are the 
beginning and end are very short this would work. However, this is not a 
good solution. It would be better to capture the end of the interval and 
act on that.

I cannot think of a well-designed solution that would depend on an event 
when there is no change in value.


Leonard Daly


>
> -Andreas
>
> On Wed, Jan 30, 2019 at 9:05 AM Andreas Plesch 
> <andreasplesch at gmail.com <mailto:andreasplesch at gmail.com>> wrote:
>
>     x3dom may want to introduce an optimization which would skip
>     generating a value_changed event for interpolators if the output
>     value actually did not change. I do not know the background but
>     one could imagine an automatically generated keyValue array with a
>     lot of constant sequential values, or just a long interval with
>     constant values.
>
>     It is clear that the spec. requires generating a value_changed
>     event for each set_fraction input event, even if the value does
>     not actually change. But what would be a real world scenario where
>     skipping this generation of constant value_changed event would
>     functionally break an event chain ? Perhaps there is even an
>     example somewhere ? Normally, keep feeding in a constant value
>     would not be expected to change an output.
>
>
>     -- 
>     Andreas Plesch
>     Waltham, MA 02453
>
>
>
> -- 
> Andreas Plesch
> Waltham, MA 02453
>
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-- 
*Leonard Daly*
3D Systems & Cloud Consultant
LA ACM SIGGRAPH Past Chair
President, Daly Realism - /Creating the Future/
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