Hi Kyle

i attached my vadsr version. additional to A D S R it has a "hold" parameter. just omit it if you think it doesn't make sense. at this point vadsr~ doesn't supply any arguments, unlike adsr~. if anybody want to make a proper abstraction, feel free... :-)

cheerio

On Jul 23, 2006, at 7:06 AM, Kyle Klipowicz wrote:

This is right on topic with something I've been trying to tinker with to no avail yet. I'm trying to implement the recent posts for the vad~ abstraction that fbar and others have been shooting around, and turning it into a vadsr~ abstraction by using the template from the adsr~ example patch.

The problem lies with the different algorithms for attack and decay, and getting a nice transition between them. I'm too tired to explain it or dig up the patch right now, but it would be cool to have an eadsr~ abstraction, and it seems within reach.

Any takers?

~Kyle

Do you have any documentation of the installation? Sounds interesting.

Note IR cameras do not see people, but the image from the projection should not emit much (if any) IR light. So you need to project on a surface (the floor) that absorbs IR light (so it looks black) and reflects visible light. Then you just light the floor with IR lights (you may need many many, and the people may not reflect much back...)

Note almost all CCD camera are actually sensative to IR light, they sometimes have IR filters so that IR light (EG from remote controls) does not show up in the image. So to make an "IR" camera, any CCD camera (webcam works but could be very noisy) will work, you just need to add a filter that passes IR light, but blocks visible light.

A black negative (fully exposed, processed film) will do the trick. Or it may be an unexposed (black) slide film... I think the latter actually.

Anyhow that should help, there are some DIY projects online for converting webcams to IR.

..b.

On Sun, July 23, 2006 1:25 am, yukio said:

Hi, Do anybody have tried infrared cameras with pd/gem? i made an installation for public spaces. using a web cam i tracked the positions of people in a space(with pix_multiblob) then i send the resulting coordinates to a processing program that create a graphic representation of the people in a alife system, allowing people interact with the creatures. In the first version of the installation i projected the processing interface to a wall so people can see theirself in the projection and can modify their positions in the real space to control their visual representation.

What i want to do now is to project the processing interface to the floor, so people can interact with the creatures in more direct way. The problem with this is that it generates a feedback , because if i project the interface in the same space that is being tracked , the system is gonna track the projected images (retroalimentation) and it doesnt work fine. A friend of mine recommended to use infrared cameras , because they just track the humans bodys and not the projections. do anybody have tried infrared cameras with pd/gem?

which one do u recommend me? any hint?

many thanx for the answers

yuk

yukio yukio_mishima@fastmail.fm

-- http://www.fastmail.fm - Does exactly what it says on the tin

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There is also a way to make an IR camera froam a black and white IR security camera. these are usually less than USD $100, though low-rez, often they will have a ring of IR LED's around the lens and will switch to IR mode in low light.

The trick is to filter out white light (visible light) You can use regular stage light gels (I've used the ones from a roscolux sample pack and they work just fine). This dude explains it:

http://members.misty.com/don/irfilter.html

Cheers, -Joe

professional IR cameras start at USD 8000. (hi quality infrared chips are still very expensive). I donŽt think this will work with any low budget product, although I did not try, and would be happy if someone found a solution for that... marius.

yukio schrieb:

...

Hi, Do anybody have tried infrared cameras with pd/gem? i made an installation for public spaces. using a web cam i tracked the positions of people in a space(with pix_multiblob) then i send the resulting coordinates to a processing program that create a graphic representation of the people in a alife system, allowing people interact with the creatures. In the first version of the installation i projected the processing interface to a wall so people can see theirself in the projection and can modify their positions in the real space to control their visual representation.

What i want to do now is to project the processing interface to the floor, so people can interact with the creatures in more direct way. The problem with this is that it generates a feedback , because if i project the interface in the same space that is being tracked , the system is gonna track the projected images (retroalimentation) and it doesnt work fine. A friend of mine recommended to use infrared cameras , because they just track the humans bodys and not the projections. do anybody have tried infrared cameras with pd/gem?

which one do u recommend me? any hint?

many thanx for the answers

yuk

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