[PD] polar physical model in pmpd/msd

[Nicolas Montgermont]

Hi Ben,

I'm not sur of what you want but what i've understand is you want some 
objects to be rejected when a screen is activated...?
perhaps the simpler way to do that is to have all the objects linked 
with fixed "virtual" masses m1, m2, m3 positionned behind the screens as 
follows:

+--------------------+
|      S3 / \ S1     
|  . m3  /   \   
|       /     \   . m1
|      /       \
|     /         \
|   S2-----------  
|
|         . m2
+--------------------+

You put all the rigidity (K) of these links to 0 until somebody activate 
a screen.
If somebody walk in front of S1 for example you activate the rigidity of 
the m2 and m3 links.
You have to do a 3D model for that... and to make a fine tuning on the 
length and strength of the links...to have something relevant.

Hope that helps.

Nicolas


B. Bogart a écrit :

>Hey all, (especially Nicholas and Cyrille, and the other pmpd experts)
>
>So I have a multi-screen setup (three machines generating three views of
>the same gem patch synced over OSC.) and I'd like to impliment a simple
>physical model the covers the following:
>
>The screens are arranged in a circle, so in this diagram the left edge is
>the same position as the right edge. The left edge of Screen 1 (S1) is the
>same point in space as the right edge of S3.
>
>Since they all show difference viewpoints of the same space its possible
>to have objects dispear between screens.
>
>+----+     +----+     +----+
>| S1 |     | S2 |     | S3 |
>+----+     +----+     +----+
>
>There are sensors above each screen and a bunch of objects in each image.
>When there is no one in front of a particular screen it will attract the
>objects around it. Hopefully what happens is all the objects end up being
>visible on the screens, though each screen need not have the same number
>of objects in it. I would also like these objects to float around a bit on
>these screens and not be static, probably an iAmbient.
>
>When someone steps in front of Screen 2, all the objects on that screen
>get immediatly repelled from this screen, and simultaneously attacted to
>S1 and S3, so that all the objects flee screen 2 for screen 1/3.
>
>Conversely when someone steps in front of screen S3, then the objects fly
>off screen 3 aiming for screen 1/2. Now comes the polar part, since the
>screens are in a circle the when someone activates screen 3, the closest
>screen is S1. I want the objects to go directly from S3 to Screen 1
>without passing through S2.
>
>I can get my head around a physical model that switches the direction of
>force when the corresponding screen is activated, but I don't know how it
>would connect with the polar stuff.
>
>Another option would be to consider a 3D physical model that matches my
>Gem space:
>      |-Seam between S1 and S3.
>+-----|-----+
>| S3 / \ S1 |
>|   /   \   |
>|           |
>|    S2     |
>|  -------  |
>+-----------+
>
>So at the centre of S1, S2 and S3 we would have a big iSphere3D that
>almost touch one and other (or should they overlap?). Then the objects
>would move in cartesian space, from the centre of S3, straight to S1 and
>S3, passing through the centre of the room.
>
>Anyone have any advice/suggestions or similar patches I can use as a
>starting point?
>
>Thanks all,
>
>.b.
>
>
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