[x3d-public] ScreenSensor, was: LineSensor

[Andreas Plesch]

Hi Leonard,

I kept puzzling over your comment. The main function of the
dragsensors is to translate from pixel/screen units to world
units/coordinate systems which requires some kind of 2d to 3d
translation. Why would you not count this difference ? This
translation is quite difficult to do and benefits from a consistency
across scenes and systems. So screen-aligned PlaneSensor is not about
the event system and in fact does not introduce any new events. So I
am not sure how the question about events applies ? Is about the
DragSensors in general ?

-Andreas

On Thu, Apr 4, 2019 at 9:59 AM Leonard Daly <Leonard.Daly at realism.com> wrote:
>
> [Removed all but the most recent post in thread. Previous post at http://web3d.org/mailman/private/x3d-public_web3d.org/2019-April/010460.html]
>
> Andreas,
>
> Reading over the explainer (github link), this looks a lot like an HTML mousedown/mousemove or touchstart/touchmove set of events. So (when running in a browser), is there any substantial difference between the two? I am not counting differences in the output coordinate system (pixels vs. scaled units). If no, then why introduce a new node and events for something that already exists. If yes, please explain what problem this solves that HTML's event system does not.
>
> Independent of the above, how would this work in an stereo immersive environment (headset)?
>
> Leonard Daly
>
>
>
> I am working on a spec. comment on screen aligned PlaneSensor
> functionality (aka PointSensor in freeWrl or SpaceSensor in Instant)
> and developed an example, a description and suggested spec. language
> here:
>
> https://bl.ocks.org/andreasplesch/f196e98c86bc9dc9686a7e5b4acede7d
> https://gist.github.com/andreasplesch/f196e98c86bc9dc9686a7e5b4acede7d
>
> This is an important but currently not available feature which cannot
> be implemented with a Proto, at least I cannot think of a way to do.
>
> Any feedback will be welcome. Actually, I have a couple comments
> myself in a follow-up message.
>
> -Andreas
>
>
>
> --
> Leonard Daly
> 3D Systems & Cloud Consultant
> LA ACM SIGGRAPH Past Chair
> President, Daly Realism - Creating the Future



-- 
Andreas Plesch
Waltham, MA 02453