[PD] Ray casting

[patrice colet]

  If it's about mouse binding in [gemwin], the math is really heavy, 
particulary if the camera is moving.

  It can be solved differently by rendering the polygons in an hidden 
frame or another gemwin, and set a different color for each new polygon, 
the binding will be about detecting color under mouse cursor with the 
help of [pix_snap] and [pix_data] and it will work even if the camera is 
moving.


Le 20/04/2017 à 12:26, baptiste chatel a écrit :
> I think so for point in polygon, see attached. It's an old attempt of 
> mine, with a mechanism to draw polygons in Gem and then tell in which 
> polygon your mouse pointer is.
>
> 2017-04-20 9:13 GMT+02:00 Max <abonnements at revolwear.com 
> <mailto:abonnements at revolwear.com>>:
>
>     Did someone here solve this in Pd before?
>
>     https://en.wikipedia.org/wiki/Point_in_polygon
>     <https://en.wikipedia.org/wiki/Point_in_polygon>
>     https://rosettacode.org/wiki/Ray-casting_algorithm
>     <https://rosettacode.org/wiki/Ray-casting_algorithm>
>
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