the current LDEM ( moon topo) -- dead

Tips for creating and manipulating planet textures for Celestia.
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John Van Vliet
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the current LDEM ( moon topo) -- dead

Post #1by John Van Vliet » 03.07.2011, 04:05

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Last edited by John Van Vliet on 19.10.2013, 01:48, edited 1 time in total.

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t00fri
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Re: the current LDEM ( moon topo)

Post #2by t00fri » 03.07.2011, 11:17

John,

hopefully, you don't apply cleaning-up manipulations to the normal map itself. This would surely destroy the required texel normalization constraint: r*r + g*g + b*b = 1! If this constraint is violated, the color-encoded gradient vector ceases to be normal to the surface...

Therefore, any such cleaning-up action has to be done before the normalmap has been calculated. I.e. at the (input) level of the 16bit elevation gray-map.

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Re: the current LDEM ( moon topo)

Post #3by John Van Vliet » 03.07.2011, 19:33

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Last edited by John Van Vliet on 19.10.2013, 01:48, edited 1 time in total.

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t00fri
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Re: the current LDEM ( moon topo)

Post #4by t00fri » 03.07.2011, 21:48

( takes 5 sec to run the 32k , gmic bug for running a 8 gig 64k tiff - causes a crash)

I rather guess that the gmic code is not made for such big textures (unlike my tools), and you are seing merely a lack of memory here in case of the 8 GB texture. I can easily work with 32k textures even on GIMP, but for 64k textures I need to optimize GIMP's cache tile size. Anyway, for >= 64k GIMP is dead slow (because it mainly uses the HD cache instead of RAM) and sometimes it crashes. I suspect that gmic suffers from the same general memory architecture and corresponding problems...

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Re: the current LDEM ( moon topo)

Post #5by John Van Vliet » 20.07.2011, 03:05

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Last edited by John Van Vliet on 19.10.2013, 01:48, edited 1 time in total.

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Re: the current LDEM ( moon topo)

Post #6by CAP-Team » 20.07.2011, 08:37

Can't wait to download that.

Great work, John.
Windows 7 Ultimate x64, Intel Core i7 2600K 3.4 Ghz, 4 GB RAM, 120 GB SSD + 1 TB hdd, nVidia GTX460 1 GB, Celestia 1.6.0.xxxx
Download my latest SVN Build

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Re: the current LDEM ( moon topo)

Post #7by abramson » 21.07.2011, 02:43

Just in time for a Moon celebration! Thanks, John!

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Re: the current LDEM ( moon topo)

Post #8by John Van Vliet » 21.07.2011, 04:13

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Last edited by John Van Vliet on 19.10.2013, 01:48, edited 1 time in total.

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Re: the current LDEM ( moon topo)

Post #9by abramson » 21.07.2011, 14:31

Indeed. I checked the new normalmap quickly, and it's a good improvement. Besides what you showed, for example Schoedinger and other polar regions get benefitted. Also do straight shapes like Rupes Recta. Excellent normalmap.

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Re: the current LDEM ( moon topo)

Post #10by John Van Vliet » 19.11.2011, 05:52

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