Hi,
I have discovered a piece of missing functionality in the new serializer for
osgTerrain::ImageLayers. The issue is that all optional layers are loaded when
an osgb file is loaded regardless of weather they should be or not.
The relevant piece of code for the the .ive format is in (in osgDB_ive) "void
ImageLayer::read(DataInputStream* in)" at line 64:
bool deferExternalLayerLoading =
osgTerrain::TerrainTile::getTileLoadedCallback().valid() ?
osgTerrain::TerrainTile::getTileLoadedCallback()->deferExternalLayerLoading() :
false;
// Should we read image data from stream
IncludeImageMode includeImg = (IncludeImageMode)in->readChar();
if (includeImg==IMAGE_REFERENCE_FILE && deferExternalLayerLoading)
{
setFileName(in->readString());
}
else
{
setImage(in->readImage(includeImg));
}
The new serializer simple adds an image serializer for an ImageLayer with no
similar checks.
I have had a quick look at coding a fix but have to admit I still dont fully
understand how the new system works in such cases. If anyone can give me some
pointers on how to go about adding this functionality that would be greatly
apprecaited as at the momment I am having to covert my terrain databases back
to .ive.
For reference, I discovered the issue as my osgb databses where laoding alot
slower than my ive based ones. The reason was that all optional layers were
being loaded even if they weren't active.
Cheers,
Brad
------------------
Read this topic online here:
http://forum.openscenegraph.org/viewtopic.php?p=34231#34231
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