Subject:
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Re: The World according to Harshbarger, Lambrecht, and Lowell
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Newsgroups:
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lugnet.build.sculpture
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Date:
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Tue, 22 Nov 2005 13:58:46 GMT
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Viewed:
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4959 times
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I'm impressed with the calculations you did there. Maybe someone will
build physical model based on these instructions and then one day we can
get my globe together with that one and see how close I was to reality
[grin].
eric
David Winkler wrote:
> In lugnet.build.sculpture, Bram Lambrecht wrote:
>
> > In lugnet.build.sculpture, David Winkler wrote:
> >
> > > I saw this and thought it was the greatest thing ever. I did my own virtual
> > > version with
> > > <http://www.brickshelf.com/gallery/happyfrosh/EarthLowellSphere/earth.mpd
> > > instructions>.
> > >
> > > <http://www.brickshelf.com/gallery/happyfrosh/EarthLowellSphere/
> > > Plate Lowell Globe>
> > >
> > > I followed Mr. Harshbarger's lead and based it on a 48 stud diameter Lowell
> > > Sphere. The land masses come from the
> > > <http://www.ngdc.noaa.gov/mgg/global/etopo5.HTML Etopo5> database provided
> > > by the <http://www.noaa.gov/ NOAA>.
> >
> > Would you mind sharing what software or code you used to map the image to the
> > sphere? I'm wondering how the globe would look with
> > <http://flatplanet.sourceforge.net/maps/natural.html one of these images>
> > mapped to the Lego palette.¬ --Bram
>
>
> The mapping from these images to a sphere is a conversion to Ldraw coordinates,
> then a rotation based on which panel we are rendering, then a conversion from
> these to polar coordinates, then interpreting phi to be latitude, and theta to
> be longitude. (Or vice versa, I always get them confused.) The polar
> coordinate equations are in most calculus books.
>
> My mapping is hand rolled code, generally as follows:
>
> foreach iX, iY, iZ
...
> |
>
> Then place a blue plate if iE is less than 0 (below sea level) and a green plate
> if iE is greater than or equal to 0 (at or above sea level).
>
> The results of this are then fed into the filling software (described in the
> bunny document).
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