Thursday, April 06, 2006

gravitational lensing - iSight geeks


Matt Turk has written a hack to illustrate gravtiational lensing with video input from iSight through a Mac. Just singular isothermal sphere lens, hack it yourself for other geometries, eh?


see here for lensing project page

and for powers of four blog entry

I will note that the possibilities here are endless, for people wanting realistic multiple magnified images...


Blogger mjt said...

Thanks for the link, Steinn. I've got some neat ideas to add on to it, for when I have some more time to play with it more extensively.

4:18 PM  
Blogger Chris said...

Don't know if either of you guys have heard of Photo Booth (this link takes you to the iMac iSight page -- Photo Booth doesn't have its own page -- weird).

Anyway, it is an app packaged with Macs with built-in iSights (can be used on any Mac with an iSight, as long as you don't see anything morally wrong getting the app via BitTorrent), and it is just a fun little app for taking stills with your camera, but you can apply effects like mirroring, fake sepia tone, fake thermal camera, etc. Matt's hack looks a lot like one of the Photo Booth effects. I wonder if they will ever allow plugins or some other way to add your own effects, like say a gravitational lens!

12:50 AM  
Anonymous Anonymous said...

The new built-in iSight with Photo Booth is great. It allowed me to take a picture of what happened to my new laptop the day after I got it in the mail. Such shoddy workmanship! Darn you, Chris, for convincing me to purchase one of these blasted machines!


10:04 PM  
Blogger mjt said...


The prof who "commissioned" this hack was looking into getting a MacBook Pro if this could be done. And it did get done, so he bought one. ;-) I haven't played with PhotoBooth enough to see if a plugin could be hacked into it or not -- but right now, the way its packaged works very well for presentations. The quicktime movie can be dragged into keynote and used directly in a presentation.

I'd really like to figure out a better way to pre-record video with these quartz composer hacks -- I recorded the demo in iMovie, and it didn't have a live display showing me what I looked like when it was recording. Thus, the idiocy.

1:55 PM  
Blogger mjt said...

As an update, I have posted a new, interactive version of this to my website. It's entitled GLOYD and it enables fiddling with parameters, as well as adding a second lens.

10:50 PM  

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