On Tue, Dec 22, 2009 at 8:10 PM, Duncan Murdoch <murd...@stats.uwo.ca>wrote:
> On 22/12/2009 12:49 PM, Mark Knecht wrote: > >> On Mon, Dec 21, 2009 at 4:42 AM, Duncan Murdoch <murd...@stats.uwo.ca> >> wrote: >> > I've just posted a demo made with the rgl package to Youtube, visible >> here: >> > http://www.youtube.com/watch?v=prdZWQD7L5c >> > >> > For future reference, here are the steps I used: >> > >> > 1. Design a shape to be displayed, and then play with the animation >> > functions to make it change over time. Use play3d to do it live in R, >> > movie3d to write the individual frames of the movie to .png files. >> > >> > 2. Use the ffmpeg package (not an R package, a separate project at >> > http://ffmpeg.org) to convert the .png files to an .mp4 file. The >> > individual frames totalled about 1 GB; the compressed movie is about 45 >> MB. >> > Could you please post the command line options you used for ffmpeg? I remember I wanted to do an animation, also from .png, and I struggled a lot. Rainer > > 3. Upload to Youtube. I'm not a musician, so I had to use one of their >> > licensed background tracks, I couldn't write my own. I spent a lot of >> time >> > picking one and then adjusting the timing of the video to compensate. >> Each >> > render/upload cycle at full resolution took about an hour and a half. >> It's >> > a lot faster to render in a smaller window with fewer frames per second, >> but >> > it's still tedious. It's easier to synchronize if you actually have a >> copy >> > of the music locally, but Youtube doesn't let you download their music. >> So >> > the timing isn't perfect, but it's good enough for me! >> > >> > Duncan Murdoch >> > >> >> Cool enough video. Thanks for sharing. >> >> I'm curious - did you do the equations for the knot in R? If so what >> did they look like, assuming there's no reason you cannot share it. >> >> > > The knot has equation > > cbind(sin(theta)+2*sin(2*theta), 2*sin(3*theta), cos(theta)-2*cos(2*theta)) > > The threads in the braid have equation > > cbind(sin(theta) + sin(2*theta)/2, sin(theta-pi) + sin(2*theta)/2, theta) > > in the local coordinates of the knot. > > Overall it's about 100 lines of R code, too ugly to post. > > Duncan Murdoch > > > ______________________________________________ > R-help@r-project.org mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide > http://www.R-project.org/posting-guide.html > and provide commented, minimal, self-contained, reproducible code. > -- NEW GERMAN FAX NUMBER!!! Rainer M. Krug, PhD (Conservation Ecology, SUN), MSc (Conservation Biology, UCT), Dipl. Phys. (Germany) Centre of Excellence for Invasion Biology Natural Sciences Building Office Suite 2039 Stellenbosch University Main Campus, Merriman Avenue Stellenbosch South Africa Cell: +27 - (0)83 9479 042 Fax: +27 - (0)86 516 2782 Fax: +49 - (0)321 2125 2244 email: rai...@krugs.de Skype: RMkrug Google: r.m.k...@gmail.com [[alternative HTML version deleted]] ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
