[PD] selecting based on vectors

[Menno van der Woude]

Hello,

using [pdp_mgrid] I am trying to get a geometric form on a GEM window
to follow the movement the camera sees. This is fairly easy, cause
[pdp_mgrid] outputs int numbers for x and y coordinates, which I can
use to have gem draw a circle/square on the appropriate place.  So far
so good.

Now, I wish to have a movement be 'followed' by white squares, that
quickly fade in and then slowly fade out. Using a grid of 7 by 7, this
means I need to create 49 squares, that, when triggered, will fade in
to white, and the fade to black, each in a separate place. I do not
knwo a better way to do this. Although inconvenient, it's fine for
this relatively low number of objects. My problem is with using the
vector info from [pdp_mgrid] to choose from 49 options.
Adding/multiplying, etc, x and y is problematic, cause it results in
identical numbers for positions that should be unique.

Any ideas on how to use vector info (meaning, in this case, x and y
info) to select unique objects?
Or is there a more efficient way to achieve the desired effect? Maybe
it is even a bad idea to combine pdp and gem?
See attached patch for an impression of what this should become like.
I have not yet completed building this, since I ran into these
troubles.

Bye! Menno.

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