[osg-users] VPB and terrain normals

Trajce Nikolov NICK trajce.nikolov.nick at gmail.com
Thu Nov 24 09:49:34 PST 2016

Thanks Robert for the good explanation (as always ;-) ). I was looking for
the piece of the code in VPB that generates the normals, was curious about
the algo. But found it in the osgUtil::SmoothingVisitor .. This one is
actually generating very nice results.

Thanks again!


On Thu, Nov 24, 2016 at 4:49 PM, Robert Osfield <robert.osfield at gmail.com>

> On 24 November 2016 at 14:32, Trajce Nikolov NICK
> <trajce.nikolov.nick at gmail.com> wrote:
> > anyone with a knowledge if VPB is generating normals for the terrain skin
> > and can point me to the code snippet where these normals are being
> > calculated?
> By default VirtualPlanetBuilder creates paged databases that use
> osgTerrain::TerrainTile for the representation and rendering of the
> individual terrain tiles. The height field component
> (HeightFieldLayer) is uses an osg::HeightField internally to store all
> the heights, no normals are stored.
> The normals used for rendering at created by the TerrainTechnique, if
> you use the default osgTerrain::GeometryTechnhique then it'll create
> an osg::Geometry with vertices, normals and texcoords to do the
> rendering.  If you use the DisplacementMappingTechnique then it'll be
> the shaders that that will compute the normals in the vertex shader.
> Robert.
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trajce nikolov nick
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