RE: [Algorithms] CLOD on TINs?? Any pointers

[Dirk R. <ri...@ph...>]

If your TINs have static geometry, then i would advice the following:

1. Partition your terrain in grid cells of a fixed size (32m x 32m or
something like, just that you get reasonable tri counts)
2. Run VIPM over each cell leaving the border tris full tesselated to avoid
cracking
3. Adjust your VIPM parameters for each cell based on distance
4. Render the whole bunch

Should be easy going if you have a VIPM solution at hand that is tweakable
enough to respect grid cell borders.

Some care has to be taken for edges that cross grid borders. Either adjust
the grid borderlines to run along these edges or just put any triangles that
touch these edges in both cells and mark them as fixed.

Charles Bloom has written a tech note about it, it's at
http://www.cbloom.com/3d/techdocs/vipm.txt


Dirk

-----Original Message-----
From: gda...@li...
[mailto:gda...@li...]On Behalf Of Phil
Scadden
Sent: Wednesday, April 10, 2002 12:45 AM
To: gda...@li...
Subject: [Algorithms] CLOD on TINs?? Any pointers


General advice is don't use TINs but I am dealing with dynamic terrain
defined by control points and creating a regular grid from them is an
expensive middle step. The number of points is always considerably less than
number of gridcells so it looks like its an approach to consider. It seems
very few people have attempted this. Any live pointers that people know
about?

----------------------------------------------------------
Phil Scadden, Institute of Geological and Nuclear Sciences
41 Bell Rd South, PO Box 30368, Lower Hutt, New Zealand
Ph +64 4 5704821, fax +64 4 5704603


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