MADE HERE : TECHNOLOGYTuesday, September 28 · 6:30pm - 8:30pmCAVE: 58 GRAND STREET (Btwn Wythe Ave. and Kent Ave.)Brooklyn, NYPlease join us for a screening, refreshments and lively conversation about artists and TECHNOLOGY. Event co-hosted by HERE and CAVE.

a new experiment in environmentally responsive architectural projection.
Manhattan Bridge Archway.
The sound of the subway trains crossing the Manhattan Bridge cause the holes and cracks in the archway to appear to expand and contract with vibrating light.

http://dumboartsfestival.com/2010/09/24/ed-purver-daf-juried-outdoor/

MADE HERE is a project which examines the challenging and eclectic lives of performing artists in New York City. Our latest issue 'Technology' examines the ways that artists can embrace the digital in their work. See the latest episode and more here: http://bit.ly/99hDTn

I think that is a common misunderstanding of the inverse square law, I've heard it before. People ask if they get a short throw lens if it will make the image brighter because it's closer.
The answer is NO, it's not the distance it's the size of the image which the brightness is proportional to.

I see where the confusion happens, if you have two matching projectors (with the same lens) and one is 5ft away from the screen and the other is 10ft away from the screen: then the one that is 10ft way will be twice and high and twice as wide, therefore 4x the sq feet of image surface.
The same amount of light is spread over 4x the area making it 1/4 as bright.

It's the increased area that makes it dimmer, but it's the distance that makes the area larger, thus the mistaken connection.

So lets clear that up, by taking one of those projectors and putting in a wide angle lens, one that makes the image 5ft wide from 5ft away. The other has a long throw lens that makes the image 5ft wide from 10ft away.
Now both images are 5ft wide, from the same lumen projector and ... both images are the same brightness.

We move the short throw projector back to 10ft away, and it's now got a 10ft wide image, and is 4x the area and 1/4 as bright.

so we can change distance, or the beam spread of the lens, and both things change the area of the projection. Now distance is decoupled from area, but we see that it's area that is proportional to brightness not distance.

Now just for fun in case anyone needs it lets look at the inverse sq law and how it is about Area.So far that was nice and easy with 5ft and 10ft, lets put the long throw lens back in both projectors and put one at 5ft and one at 15ft. Away from the screen.
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I've mentioned that I love Isadora, and I have a lot of patches that might be useful so I'm going to try and share a few here.   If you have any problems or questions about Isadora feel free to ask me, and I'll see if I know or can figure out how to help.

You will have to have "the newest" or close to newest version of Isadora to open my example files (1.2.9 on the Mac, or 9b51 on the PC)

One of the things I love the most about Isadora is the Quad Distort Actor.   I had been using my own cobbled together software in which this was the primary feature, and when I started using Isadora I though that it was so much better than everything I had tried, if only it had this one more feature.  Well Mark added the feature and I was hooked.

The simple explanation is that a Quad Distortion actor is just Like a Projector but you can control it's corner points to correct for even radical keystone distortions.

I think this is obviously useful, but I want to point out some of the great things that it makes possible.
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