The black dots represent unpainted background due to a mismatch between the (for latitude: for longitude:) iteration over the grain of the original map with the projected coordinates of the viewport. In other words, no cell on the original map reprojected right on that pixel. Adding a tilt or twist seems to make this problem worse. Cheap fixes include post-processing to smooth away black pixels within the disk, or chopping up the original map into more identically colored adjacent pixels to give a finer grain and higher likelihood of painting all the pixels in the disk.
The right thing to do is probably to code up a reverse projection from "disk view" space back to "map" space and iterate over pixels within the disk so that nothing in the disk view remains unpainted. --- According to the web site note, the maps are individually available for re-use according to various terms -- probably a "credit given" , but I haven't written to the site owner yet. Let me do that tomorrow (after I sleep and collect my wits, before I go out of town again for part 2 of my vacation week). "Most of these maps below are slightly "tweaked" from public domain maps; some are based on maps/data which should also be credited to the original authors (even if public domain, they deserve credit), so please contact me regarding redistribution, commercial use, etc." -- Wm. Robert Johnson. So in some cases I could go back to William Robert Johnson's sources, or I could just see if some kind of credit is appropriate. Does Thousand Parsec have an official "About" or "Credits" section? -- Jeff On Mon, Aug 18, 2008 at 7:04 PM, Tim Ansell <[EMAIL PROTECTED]> wrote: > Hey jsmiller, > > That looks pretty cool. Where are the black dots coming from? > > Do you know what license these files are under? If they are public > domain it would be good to add them to our repository. > > Tim > > On Wed, 2008-08-13 at 22:48 -0700, Jeffrey Miller wrote: > > Follow-up: I found some cylindrical projection planetary maps here: > > > > http://www.johnstonsarchive.net/spaceart/cylmaps.html > > > > which seem to work well as textures, allowing for some missing data. > > Attached is an example of a reprojected Jupiter disk. > > > > _______________________________________________ > tp-devel mailing list > [email protected] > http://www.thousandparsec.net/tp/mailman.php/listinfo/tp-devel >
_______________________________________________ tp-devel mailing list [email protected] http://www.thousandparsec.net/tp/mailman.php/listinfo/tp-devel
