[osg-users] VPB & osgTerrain basic functionality

Dario Filipovic tarqe39 at hotmail.com
Fri Mar 20 13:42:50 PDT 2009


Hi all!

I was wondering can someone give me a few hints on what
to look for in VPB in sense of its functionality. I not sure for
instance what happens when you push a image file trough osgdem. From
what i see as a result it seems that heightmap image and texture get
fragmented and put into hierarchical structure of nodes with different
LOD(TerrainTiles). Files with different LOD are then used in paging
mechanism to dynamicly load generated terrain fragments at runtime.Is
this so? Does it mean that there are no algorithms such as ROAM used?
ALso,
i would like to be sure of what does osgTerrain do. Ive tried to read
sources (Im not an experienced programmer ;)) and from what i see
TerrainTechnique is used as an interface for real culling and updating
functionality of terrain node, Locator is used as a coordinate system
manager. osgTerrain seems to be a wrapper around a HeightField, and
what ive seen from osgTerrain example it does not include any LOD
functionality.

Im sorry for swamping with questions and toughts,
but there is little or no documentation about this, and understanding
things by reading sources is very time-consuming. Im generaly
interested in abstract models that are used in osgTerrain and VPB, more
precisely in basic functionality guidelines, so i could at least make
my way trough sources faster. 

Many thanks! :)

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