Editing ROAM

{{short description|Continuous level of detail algorithm}}
{{other uses|Roam (disambiguation)}}
'''Real-time optimally adapting mesh''' ('''ROAM''') is a continuous [[Level of detail (computer graphics)|level of detail]] [[algorithm]] that optimizes terrain [[Polygon mesh|mesh]]es. On modern computers, sometimes it is more effective to send a small amount of unneeded polygons to the [[Graphics processing unit|GPU]], rather than burden the [[central processing unit|CPU]] with LOD (Level of Detail) calculations&mdash;making algorithms like geomipmapping more effective than ROAM. This technique is used by graphics programmers
in order to produce high quality displays while being able to maintain real-time frame rates. Algorithms such as ROAM exist to provide a control over scene quality versus performance in order to provide HQ scenes while retaining real-time frame rates on hardware. ROAM largely aims toward terrain visualization, but various elements from ROAM are difficult to place within a game system.<ref>[http://www.hindawi.com/journals/ijcgt/2008/753584/ White, M. (2008). Real-Time Optimally Adapting Meshes: Terrain Visualization in Games. Retrieved from]</ref>

To assist regional geological mapping, more abundant and visualized expression forms are highly needs. Thus, the 3D terrain model is adopted as the carrier for the demands in many correlative fields. Based on the regular grid DEM (Digital Elevation Model) in DRGS, ROAM algorithm is applied to create a more dynamic model, which will give consideration to the importance of different features and select correspondence level of detail.

==Original Paper== 
The algorithm was introduced in the paper " ROAMing Terrain: Real-time Optimally Adapting Meshes" appearing in the Proceedings of IEEE Visualization 1997. The authors are
*Mark Duchaineau
*Murray Wolinsky
*David E. Sigeti
*Mark C. Miller
*Charles Aldrich
*Mark B. Mineev-Weinstein

== See also ==
* Geomipmapping

==References==
{{reflist}}

==External links==
*[http://www.hindawi.com/journals/ijcgt/2008/753584/ ROAM:Terrain Visualization in Games]
*[http://www.llnl.gov/graphics/ROAM/ ROAM homepage]
*[http://www.llnl.gov/graphics/ROAM/roam.pdf ROAM white paper (PDF)]
*[https://www.flipcode.com/archives/article_geomipmaps.pdf Fast Terrain Rendering using Geometrical Mipmapping] Willem H. de Boer

[[Category:Computer graphics algorithms]]


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