[osg-users] VPB and terrain normals

Robert Osfield robert.osfield at gmail.com
Thu Nov 24 07:49:59 PST 2016

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.


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