Re: [Algorithms] Tangential Curvature of terrain

[Pai-Hung C. <pa...@ac...>]

----- Original Message -----
From: Klaus Hartmann <k_h...@os...>
To: <gda...@li...>
Sent: Tuesday, August 22, 2000 4:34 PM
Subject: Re: [Algorithms] Tangential Curvature of terrain


> Pierre,
>
> I think it's better if you look for yourself, because people tend to show
> the nicest screenshot they can find, and so do I :)
>
> (Win95/98/2K, 108 KB)
> http://www.thecore.de/TheCore/gdhighlands.zip
>
> Some instructions...
>
> First run the program Highlands.exe. It'll then take a while before you
see
> some terrain, because the program needs to generate the height field and
> textures.
> If you have enough video memory, then try to maximize the window now,
> because that looks better... after all you want to judge the quality of
the
> texture, and not of quality of the LOD algorithm. So it doesn't matter if
> things run a bit slower.
> Now press and hold the <4> key, until the status bar at the top reads
"MRes:
> 15". Note, that the status bar will not update while you hold the key, so
> just hold it long enough. Next step is to enable geomorphing by pressing
the
> <g> key once. Now you can walk around (press <h> for help).
>
> Some more info...
> [1] The sample is work-in-progress, so there are a couple of flaws. For
> example, there are situations, where popping occurs, even though
geomorphing
> is enabled. Also, I don't free all memory, so don't use the <r> key too
> much. In addition, the rendering code is slow (the OpenGL specific
pieces).
>
> [2] The terrain is 1025x1025, and the texture is 1024x1024 (divided into
> sixteen 256x256 patches). Thus, there's less than 1 texel per data point.
>
> [3] I didn't use any image files to create the surface texture. It is
> color-based only. In fact there are seven different colors. 3 of these
> colors are green, 2 are sand, and 2 are gray. The noise-like
> ground-structure was done by adding a small random value to he
illumination
> factors.
>
> [4] There are two light sources. The first one is a direct sun-light that
> shines from the east, and the second is an anit-sunlight source that
shines
> from the west. The lighting is sort of bad, and that's why darker places
> look much better than bright places.
>
> [5] There's no additional noise used to break up the transitions between
the
> ecosystems. It's purely based on the height field.
>
> [6] As I said... some places look good, which does not mean all places :)
So
> you'll have to walk a bit, and maybe try a couple of other terrain (see
> help). Most of the time, things look good, if you are not too close to the
> sight (there's no detail mapping or something like that).
>
> Niki
>
> ----- Original Message -----
> From: Pierre Terdiman <p.t...@wa...>
> To: <gda...@li...>
> Sent: Tuesday, August 22, 2000 4:29 PM
> Subject: Re: [Algorithms] Tangential Curvature of terrain
>
>
> > > There are places in my terrain that look almost real, and I could
> further
> > > enhance this by casting shadows.
> >
> > What about a new snapshot...?   :)
> >
> > Pierre
> >
> >
> >
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> >
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>
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