Hi,
I have geocentric dataset (which is already compiled with osgDEM) and
I'm facing an issue.
In my shaders I rely on valid texture coordinates for tangentSpace
generation and various other effects like detail-splatting.
Unfortunately (and quite obvious due to performance restrictions) the
GeometryTechnique will not create texture coordinates for Terrain tiles
without textures.
Due to missing LandSat-data at this areas, there are no images for those
areas.
(see around line 484 in GeometryTechnique.cpp)
I wonder if there are any other options than
a) modifying the VertexNormalGenerator::populateCenter function to
create texture coordinates anyways
b) Overriding the GeometryTechnique to use a custom
VertexNormalGenerator which clones the functionality of the original one
+ adding texture coordinates for tiles without ImageLayer.
Since the dataset is quite big, so recompiling it is out of the question
right now.
Also it would be a performance killer to traverse the TerrainTile
manually and re-add some fake image layer.
My idea would be to change the vertexNormalGenerator to optionally
create texture coordinates. But I don't have an idea yet how to get this
option into it.
Any hints, ideas?
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