Thread: Re: [Celestia-developers] Mask textures
Real-time 3D visualization of space
Status: Beta
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From: Grant H. <gra...@bl...> - 2003-06-11 15:32:34
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> If you have the time, could you resize and check the rest of your > masks to the lores directory? If you do, make sure that you add them as > binary files :) Done - Mercury, Mimas, Miranda, Oberon, Titania, Umbriel and Triton. I think they're all that need masked - the other Saturnians are pretty good LOK textures as they are. *I haven't modified solarsys.ssc since there's no way I can check that my modifications work.* Grant |
From: Grant H. <gra...@bl...> - 2003-06-11 19:43:20
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Chris: > I've compiled a new EXE that you can try Many thanks. Working fine for me - I've checked in a new solarsys.ssc with the LOK masks for Mercury, Mimas, the major Uranians and Triton added. The colours look good to my eye, but let me know if you think they're wrong. Grant |
From: Fridger S. <t0...@ma...> - 2003-06-11 20:48:07
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Grant Hutchison wrote: > > Chris: > > I've compiled a new EXE that you can try > Many thanks. Working fine for me - I've checked in a new solarsys.ssc with > the LOK masks for Mercury, Mimas, the major Uranians and Triton added. The > colours look good to my eye, but let me know if you think they're wrong. > > Grant > Grant: I have looked at your new -lok- masks and wonder why you have chosen such an /abrupt/ transition from known to unknown. One could easily make the masks to come more gradually into action and also match the mask color (by computer) to the color of 'last knowledge'...Altogether this would provide a much more pleasing view without sacrificing much of scientific rigor;-) Just a suggestion... Bye Fridger |
From: Grant H. <gra...@bl...> - 2003-06-11 21:03:32
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Fridger: > One could easily make the masks to > come more gradually into action and also match the mask color (by computer) to > the color of 'last knowledge'... I'm sure one could, but this one certainly couldn't ... ;-) My texture manipulation skills are rudimentary at best - please feel free to improve on my efforts. Grant |
From: Fridger S. <t0...@ma...> - 2003-06-11 22:16:48
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Grant Hutchison wrote: > > Fridger: > > One could easily make the masks to > > come more gradually into action and also match the mask color (by > computer) to > > the color of 'last knowledge'... > I'm sure one could, but this one certainly couldn't ... ;-) > My texture manipulation skills are rudimentary at best - please feel free to > improve on my efforts. > > Grant ;-) Here is a 3 minute hack of what I typically had in mind (the left image is with your original mask) http://www.shatters.net/~t00fri/images/mercury-lok-mask.jpg Incidentally, with the mask switched ON, the mercury bump-map is deactivated?? Is this a 'feature'? Bye Fridger |
From: Chris L. <cl...@ww...> - 2003-06-11 22:29:57
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On Thu, 12 Jun 2003, Fridger Schrempp wrote: > Grant Hutchison wrote: > > > > Fridger: > > > One could easily make the masks to > > > come more gradually into action and also match the mask color (by > > computer) to > > > the color of 'last knowledge'... > > I'm sure one could, but this one certainly couldn't ... ;-) > > My texture manipulation skills are rudimentary at best - please feel free to > > improve on my efforts. > > > > Grant > > ;-) > > Here is a 3 minute hack of what I typically had in mind (the left image is with > your original mask) > > http://www.shatters.net/~t00fri/images/mercury-lok-mask.jpg > > > Incidentally, with the mask switched ON, the mercury bump-map is deactivated?? > Is this a 'feature'? You have to modify the AltSurface for Mercury to use the bump map. Whether or not the current bumpless AltSurface is a 'feature' depends on how you feel about using the rather dubious bump map in a scientifically accurate rendering of Mercury. I'd be satisfied with it as is, or with the bump map reenabled. While we're discussing the topic of a realistic Mercury, perhaps it's time to remove that fake orange-yellow hue. In reality, shouldn't Mercury be about the same color as the Moon? Perhaps not though . . . it's denser, presumably because it's more iron rich, and it's proximity to the Sun might affect the surface coloration. Is there a better guess than the current color? --Chris |
From: Grant H. <gra...@bl...> - 2003-06-11 23:37:02
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> While we're discussing the topic of a realistic Mercury, perhaps it's time > to remove that fake orange-yellow hue. In reality, shouldn't Mercury be > about the same color as the Moon? Perhaps not though . . . it's denser, > presumably because it's more iron rich, and it's proximity to the Sun > might affect the surface coloration. Is there a better guess than the > current color? The artist Don Davis, who has given a fair bit of thought to this, feels Mercury should be moon-coloured, for what it's worth. See his rendering at: http://www.donaldedavis.com/2002_addons/SSYCOLRS.html I'd certainly be much happier with something like. Grant |
From: Fridger S. <t0...@ma...> - 2003-06-12 08:10:31
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I have downloaded Don's latest 2k 'interpreted' Pluto texture and examined whether it reproduces the correctly aligned HST-FOC surface markings and color, if compared with a Gaussian blur kernel of 16deg FWHM (corresponding to the HST-FOC resolution). My results are here (resized to 1k): http://www.shatters.net/~t00fri/images/pluto1k-concept4-comp.jpg 1)Apparently Don's texture needs a wrapped offset of width/2, otherwise the subCharon hemisphere is NOT centered at 180 degrees and the corresponding markings are /bright/ instead of dark, contradicting general consensus... 2) The texture color does not agree well with the recently measured color profile that I have /computer/ mapped onto the original HST-FOC grayscale data in the center image. I wonder what makes it so difficult to produce an 'interpreted' texture with Triton surface map and a few craters, satisfying /all/ known boundary conditions under poor resolution views? Bye Fridger |
From: Grant H. <gra...@bl...> - 2003-06-11 23:28:27
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> Here is a 3 minute hack of what I typically had in mind (the left image is with > your original mask) > > http://www.shatters.net/~t00fri/images/mercury-lok-mask.jpg While accepting it's a quick job, I guess I have to say I prefer mine at present. ;-) The limits to knowledge are pretty sharply drawn in the usual USGS map of Mercury - a very small version for reference is here: http://www.solarviews.com/browse/merc/mercurycyl1.jpg I'd guess that there might be lo-res data available to fill the drop-out in the visible hemisphere, but the cut-off meridians most likely represent an abrupt end to sunlight and knowledge. BTW: I think at present (and I know you're likely planning to improve this) the narrow strip of absent data is sufficiently transparent so as to appear like an albedo feature to the uninformed eye. Similarly with the Uranians - see an example here http://www.solarviews.com/raw/uranus/oberoncyl1.jpg Triton, though, certainly has a lo-res margin to its data which would very much profit from your approach - see here http://www.star.ucl.ac.uk/~apod/solarsys/raw/nep/trimap1.jpg Grant |
From: Chris L. <cl...@ww...> - 2003-06-12 21:45:05
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On Wed, 11 Jun 2003, Grant Hutchison wrote: > Fridger: > > One could easily make the masks to > > come more gradually into action and also match the mask color (by > computer) to > > the color of 'last knowledge'... > I'm sure one could, but this one certainly couldn't ... ;-) > My texture manipulation skills are rudimentary at best - please feel free to > improve on my efforts. Grant, Thanks again for taking care of the limit of knowledge masks. I noted one apparent omission though . . . There's an AltSurface referencing a mimas-lok-mask.png texture, but it doesn't appear to be in CVS. --Chris |
From: Grant H. <gra...@bl...> - 2003-06-12 21:53:39
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> There's an AltSurface referencing a > mimas-lok-mask.png texture, but it doesn't appear to be in CVS. Oops. It is now. Grant |