[osg-users] Generate geometry from a digital elevation model

Sebastian Messerschmidt sebastian.messerschmidt at gmx.de
Thu May 21 00:26:30 PDT 2015

Hi Christian,

Have you checked if osgdem supports it? I think it will happily convert 
anything into osgTerrain which can be interpreted as height data by gdal ...

> Hi,
> I am currently wondering which is the better way to go from a simple 
> digital elevation model (ESRI ASCII Grid format) to a geometry. The 
> model has a very limited area and resolution.
> These are the two methods I find feasible with stock OSG features:
> Either I could feed all the 3D points on the grid into the 
> osgUtil::DelaunayTriangulator. However I noticed this class generates 
> normals that require a BIND_PER_PRIMITIVE - possibly causing a 
> fallback to the slow rendering path.
> Alternatively I could put the data into an osg::HeightField and use a 
> ShapeDrawable to display it.
> Which of the two methods is perferable from a performance standpoint? 
> What I would like to get is a bit of a simplification of the geometry, 
> where larger triangles are used in areas with less surface features. 
> Which of the two methods can provide this?
> I do not want to use osgEarth, as it is a bit too big in scope for my 
> purpose and it has a lot of extra dependencies.
> Christian
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