Digital Elevation Models + Aven

Mark Shinwell Mark.Shinwell at
Wed Apr 20 12:46:03 BST 2005

On Wed, Apr 20, 2005 at 12:26:37PM +0100, Olly Betts wrote:
> > and the colour depth-profile is rather useful to see where abouts our
> > mythical 'walk in entrance at -700m' is going to appear, so I may look
> > into creating a seperate 'flag' in the .3d files for 'DEM data'
> Is there any benefit in converting the DEM data into .3d rather than
> just allowing aven to read it directly?  Most DEM data will be in one
> of a small number of formats, so aven just needs to know how to read
> those.

One of the issues which halted my work on this was the issue concerning
the file formats.  It is not totally trivial---for example, one might
end up with .3d files depending on other DEM files.

> Mark wrote some code to render surface terrain already.  It's not been
> folded into the current development version yet, but I'd suggest at
> least looking at it, and probably reusing much of it.  He rendered the
> terrain as translucent on top, but opaque when viewed from below,
> which was pretty effective.

I'll see if I can dig out some screenshots, and the code...

Mark Shinwell -- email: Mark.Shinwell at
Theory and Semantics Group, University of Cambridge Computer Laboratory

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