What kind of LOD tech Ryzom used?

I found LOD tech articles/papers in internet and studied them these days, so I know DLOD, CLOD, geomipmapping, QuadTree, ROAM, ROAM2.0 now. But, after I launching Ryzom solution and read the source code, I cannot find any clue what kind of LOD tech Ryzom used. This make me feel sad, :(

So I come here for help, I want to know how Ryzom tackle the Level Of Details in landscape(or maybe zone?), thanks.

Replies (4)

RE: What kind of LOD tech Ryzom used? - Added by vl over 7 years ago

There are different type of LOD.

For the shapes like avatars, NeL is using something similar to the texture mipmapping techniques but for the geometric. With a Progressive Mesh representation, it constructs different level of detail that are then interpolated with geomorph algorithm.

For the landscape, it uses Bezier patches and the ROAM algorithm, to provide adaptive subdivision of the landscape based on distance from the camera, steepness.

RE: What kind of LOD tech Ryzom used? - Added by sambsp over 7 years ago

Can I have some details, for me，there is a gap between the ROAM algorithm and Ryzom's real code. Maybe I need you to show me which file's implementation link ROAM and the landscape, thanks.

RE: What kind of LOD tech Ryzom used? - Added by vl over 7 years ago

Hi,

Ryzom landscape was coded in 2000/2001. I think it contains a specific implementation of the ROAM algo to fit Ryzom needs. We have a very few number of very old files but they are in French, not sure it'll help.

RE: What kind of LOD tech Ryzom used? - Added by sambsp over 7 years ago

vl,

What a bad information for me!

...

I'm kidding, anyway, thank you for your original message.

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