hi guys,

I am a total beginner in PD. I would like to get some help with something which might seem very simple for you.

basically, my set up is this one :

-A camera shooting the floor from the ceiling linked by usb to PD.
-There is a pattern drawn on the floor

What I would like to achieve is this :

When someone is standing over a point X of the drawing I want PD to send Midi notes out.

Do you guys have any example of a patch which could help me? The hard part for me is the GEM part. For the MIDI I kind of know what to do.

Thank you so much.

PS :

This video is pretty close of what I want to do. Especially for the pink stickers area. Thanks.