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Index › Discussion › Exhibition › Interactive Snow

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Interactive Snow (Read 3560 times)

Johnny Ow

Interactive Snow
Feb 15^th, 2009, 7:40am

I made a sketch around Christmas time that takes a web cam input, draws a bunch of falling snow, and let's a user interact with the snow. This is by no means original, as I copied the idea from an article I read about Charles Forman.

I used GSVideo to get fast web cam captures. The particle system and motion analysis were implemented in GLSL thanks to GLGraphics. I was easily getting 30fps on a NVidia 8800GT video card with 8192 particles running at 960x540.

http://vimeo.com/2633447

Jack Perkins Junior Member Offline Posts: 99	Re: Interactive Snow Reply #1 - Feb 16^th, 2009, 10:09am This is great, the swirls really sell it

andreaG

Re: Interactive Snow
Reply #2 - Feb 17^th, 2009, 10:06pm

Johnny,
taht's really cool (hehehe). 2 things:
1. How about sharing the source code?
2. I noticed you'd like to change dots with snowflakes: well don't do it, dots are much more evocative than blatant snowflakes. To have an idea have a look at the great snow created by Julian Vidal, it's here http://julianvidal.com/X/processing/snow5/

It might be more interesting if you'd let snow accumulate un the bottom of the screen and progressively hide the video image.
Andrea

Johnny Ow

Re: Interactive Snow
Reply #3 - Feb 19^th, 2009, 6:27am

Andrea,

1. Source code: http://bigpixel.com/projects/sketch_081221a_Snow.rar. This version doesn't use GLSL for the particle system or draw calls, but it might be easier to read. You'll need to d/l gsvideo, glgraphics, and traer physics libraries.

2. I haven't worked on this in a couple of months as I'm currently engrossed with other projects. When I get back to it, I'll have to revisit the snow vs. snowflake question. The accumulation idea might work depending on which direction I take this eventually.

« Last Edit: Mar 19^th, 2009, 3:59pm by Johnny Ow »

vuhec

Re: Interactive Snow
Reply #4 - Feb 23^rd, 2009, 9:03pm

thanks for posting this! video looks great! have you seen setpixel snow is fun: http://www.setpixel.com/content/?ID=snow

i just tried to run the source code and have an

"unsatisfiederrorlink: can't load library oil-0.3"

this is the section that is highlighted:
cam= new GSCapture(this, camWidth, camHeight, fps);

i have gsvideo folder sitting in my libraries folder in sketches.

Johnny Ow

Re: Interactive Snow
Reply #5 - Feb 24^th, 2009, 1:45am

Vuhec,

yes, I've seen that article--it's what inspired me to make this sketch, a shameless clone.

I believe the error you are getting is related to a GStreamer configuration or installation issue. Make sure the example GSVideo sketches are working on your system. Checkout this string of posts for further info:

http://codeanticode.wordpress.com/tag/gstreamer/

vuhec

Re: Interactive Snow
Reply #6 - Feb 25^th, 2009, 6:41am

Thansk for the codeanticode link...i am running OSX10.5 and apparently i have open precessing through terminal to access the gsvideo libs.

i tried to run it now and lots of the libs are loading, but i am getting the following error:

Exception in thread "Animation Thread" java.lang.

IllegalArgumentException: No such Gstreamer factory: osxvideosrc

Any thoughts? Thanks Johnny!!!!

vuhec

Re: Interactive Snow
Reply #7 - Feb 25^th, 2009, 10:04pm

Update: my latest error has been addressed by codeanticode forum. quote:

"As for the problem with GSCapture class, it is not functional yet. I still have to manage to include the required underlying OSX GStreamer plugin for capture, osxvideosrc, in gsvideo-mac."

Bummer for me. I really want to give this a try and learn from this project. Hopefully soon...

Johnny Ow YaBB Newbies Offline Posts: 49	Re: Interactive Snow Reply #8 - Feb 26^th, 2009, 3:14am Ah, sorry to hear that.

vuhec

Re: Interactive Snow
Reply #9 - Mar 13^th, 2009, 5:13pm

i've got the sketch to work for a few seconds with particle flowing and starting to be affected by movement, but it freezes and i am getting this error message:

highlighted: particles[p].addVelocity(velMult*bufOpticalFlow[b], velMult*bufOpticalFlow[b+1], 0.0);

error:
ArrayIndexOutOfBoundsException: 1758

I did have to change the resolution of the sketch to 640x480...mayeb that is my hang-up?
i changed the following to 640x480
int camWidth & Height
int cropWidth & Height
int sketchWidth & Height

i wasn't sure why the cam, crop and sketch ratios were all set differently?

thanks jow!

vuhec YaBB Newbies Offline Posts: 13	Re: Interactive Snow Reply #10 - Mar 15^th, 2009, 6:32pm nevermind. i figured out my problem...sketch needed to be bigger than cam. i am digging in and learning. i am curious your thoughts on using the color capture vs. black filter? this is cool. thanks again...

Johnny Ow

Re: Interactive Snow
Reply #11 - Mar 17^th, 2009, 7:09pm

Glad you figured it out. I believe I do the odd cropping because I wanted a 16:9 aspect ratio output but the camera captures 4:3.

I some times get bored of the colored capture, so I use the bw filter. The ultimate goal is to make a custom shader that incorporates some of the colors from the color capture in a more interesting and non-photo real way.

« Last Edit: Mar 19^th, 2009, 4:04pm by Johnny Ow »

micron YaBB Newbies Offline Posts: 9	Re: Interactive Snow Reply #12 - Mar 18^th, 2009, 3:49pm oh no!!! the link to the source is broken!!! Anyone can share the code of interactive snow... it is beautifull and i like to develop for interactive dance performance... Thanks Micron

andreaG YaBB Newbies Offline Posts: 14	Re: Interactive Snow Reply #13 - Mar 18^th, 2009, 5:00pm Micron, I have a copy with me, where should I send it?

micron YaBB Newbies Offline Posts: 9	Re: Interactive Snow Reply #14 - Mar 18^th, 2009, 5:03pm WOW !!! micron@processing.it this is my mail thanks so much guy!!!

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