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PencilBrush (Read 2291 times)
david lu
PencilBrush
Sep 13th, 2005, 5:33am  
PencilBrush is a custom drawing instrument. Imagined as a brush whose hairs leave delicate, pencil-like marks on screen, it grows additional hairs to render quick, broad strokes, and abandons hairs for smaller, slower strokes.

http://david-lu.net/sketches/programs/PencilBrush/
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mflux
Re: PencilBrush
Reply #1 - Sep 13th, 2005, 12:27pm  
It's pretty neat. Will we see a color changing version?
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watz
Re: PencilBrush
Reply #2 - Sep 13th, 2005, 1:29pm  
Nice. I blogged it over on Generator.x.

I like it even better with divisor_per_sec set to a higher number...
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marius watz // unlekker // code & form // Generator.x
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david lu
Re: PencilBrush
Reply #3 - Sep 15th, 2005, 2:00am  
Thanks for the kind words. And blogging. I haven't given much thought to colors. Perhaps, perhaps.

Mmmm, divisor_per_sec is meant to be a constant; it's a number tuned for my recent model Powerbook and Tablet PC. The variable to play with is the second parameter in the calls to the Interpolator constructor. This value is the number of seconds intended to elapse while interpolating from one value to another. At the moment, it is hardcoded as 1, indicating that the pen takes one second to 'follow' the mouse.

Your way works too, Marius. Just documenting here, as I didn't comment very well.
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watz
Re: PencilBrush
Reply #4 - Sep 15th, 2005, 3:30pm  
No worries, when playing with other people's code I usually just grab the first variable I see and bend it around a little. There is invariably a "better" way, of course.

I like the groovy, wavy motion it gets when the interpolation takes longer.
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marius watz // unlekker // code & form // Generator.x
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david lu
Re: PencilBrush
Reply #5 - Oct 6th, 2005, 4:32am  
two more iterations:

http://david-lu.net/sketches/programs/BranchyBrush/

http://david-lu.net/sketches/programs/ScreenBrush/
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david lu
Re: PencilBrush
Reply #6 - Dec 24th, 2005, 12:06pm  
two more iterations, using color:
http://david-lu.net/sketches/programs/NicePen/

and some early color studies:
http://flickr.com/photos/dahveed/sets/1199793/
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david lu
Re: PencilBrush
Reply #7 - Dec 25th, 2005, 3:00am  
and even more:

http://david-lu.net/sketches/programs/NicePenBundle/

http://flickr.com/photos/dahveed/sets/1650781/
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david lu
Re: PencilBrush
Reply #8 - Dec 27th, 2005, 6:45am  
snippets from an animated version:
http://david-lu.net/sketches/animation/
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« Last Edit: Dec 28th, 2005, 3:30am by david lu »  
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Ira
Re: PencilBrush
Reply #9 - Dec 27th, 2005, 4:56pm  
really, really beautiful and sensitive work! I suspect you're a Jared Tarbell fan as well.

I developed a series of pieces some time ago that you might find interesting. http://iragreenberg.com/ira_greenberg_data/code/protobytes/index.html
This is a on-going project, waiting for me to find some time. You've provided some wonderful inspriation. Thanks.
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david lu
Re: PencilBrush
Reply #10 - Jan 6th, 2006, 4:01am  
ira, thank you for the kind words! you know, your studies remind me of something mike davis worked on a while back:
http://www.lightcycle.org/2004/11/index.php#000341

i fooled around with his algorithm a bit and was able to tease out some results that resemble some of your sketches. i'll poke around and see if i have documentation... there were some good ones....
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