Interactive GUI Patch/Tessellation
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I'm trying to design a GUI where the user is able to draw a series of connected patches (a tessellation) over a background image and then assign a value to each of them.
I'm trying to figure out which is the best way to achieve this.
I found the impoly function that is very close to what I need for the first patch. However, when I draw the second polygon I would like to be able to "attach" it to the previous one without having to repeat the shared edges. Moreover I would like to be able to "snap" to the existing vertices in order to avoid nasty holes in the tessellation.
I was thinking to a couple of solutions:
- modify the impoly function to introduce this behavior, but this isn't very easy.
- define some objects that exploit the impoly function when edited and then "freeze" in a patch object.
Do you have suggestions/ideas?
Thank you very much regards Luca