I have been using OSG for a number of years for a commercial product. Our
product loads various models and earth views as the user requires them (for
security monitoring – buildings and campuses mostly). I have a problem
with 3.6.3/4 that wasn't there in 3.4.0.
I have an OpenFlight model (sample/demo model) that uses textures for
terrain and on buildings. The first time I load it all is fine. However,
if I load another model (or another graphics file – the application
supports AutoCAD, raster, OSG Earth, and ArcGIS formats as well) then
reload the model the terrain is black and the textures are corrupted if
they are not black. This worked fine with 3.4.0 and 3.4.1 but does not
work with 3.6.3 or 3.6.4.
I have debugged into the code and it appears that the model and textures
are always reloaded from the cache and I cannot override this (setting
Options::CACHE_NONE doesn’t affect it - in 3.4.0 the model always loaded
from files with Options set to CACHE_NONE). If I look at the model graph
in memory (after the first load), the textures appear to be erased or
over-written during the traversals in one of the classes called in
ViewerBase::runOperations() (though it’s a little confusing to me at that
point, it appears to be when GlobalObjectVisitor::compile() calls
node.accept(*this)). During the traversals where the textures appear to be
over-written, I noticed the context ID is always 0, so the textures appear
to be reloaded, over-writing the original data in the process (though I
could be quite confused as to what I am seeing and it may all be irrelevant
to the issue).
Below is a short snippet from my initialization and cleanup code between
model loads. I load the model, add a clip node to peel down through the
models vertically. I also add other nodes to hold embedded bitmaps
(Billboards) representing security devices – cameras, doors, alarm points,
etc. Those details are omitted from the code below. After the model is
loaded I set up the graphics context and render the image to an offscreen
window (which is then copied to a memory bitmap). The application is a
Windows console app (with hidden window) that streams bitmap images to the
client app via named pipe on the same machine (I know, it’s complicated,
but it’s a complex environment, including live video windows).
As I said, it has worked fine with previous versions of OSG (back to 3.0.1,
if not earlier). This may be specific to Open Flight models, as I can load
FBX models, OSG earth files, or the cessnafire.osg model and the textures
appear correct.
Any help would be appreciated. If the model would always be loaded from
the file when Options::CACHE_NONE were set it would solve my problem.
OSGLoadResult OpenSceneGraphBitmap::LoadModel(std::string fileName, osgDB::
Options* dbOptions)
{
CleanupModel();
if (m_Root == nullptr)
m_Root = new osg::Group; // Init the main Root
Node/Group
// Load the Model from the model name
osg::Group* model = dynamic_cast<osg::Group*>(osgDB::readNodeFile(
fileName, dbOptions));
if (model != nullptr)
{
// Optimize the model
osgUtil::Optimizer optimizer;
optimizer.optimize(model);
optimizer.reset();
// Create the clip node and add to scene
osg::ComputeBoundsVisitor cbbv;
model->accept(cbbv);
osg::BoundingBox bb = cbbv.getBoundingBox();
osg::ref_ptr<osg::ClipPlane> clipPlane = new osg::ClipPlane;
clipPlane->setClipPlane(0.0, 0.0, -1.0, bb.zMin() +
(bb.zMax() - bb.zMin()));
clipPlane->setClipPlaneNum(0);
osg::ref_ptr<osg::ClipNode> clipNode = new osg::ClipNode;
clipNode->setName("CLIP_NODE");
clipNode->addClipPlane(clipPlane.get());
clipNode->setCullingActive(false);
model->setStateSet(clipNode->getStateSet());
m_Root->addChild(clipNode);
m_Root->addChild(model);
m_Root->setDataVariance(osg::Object::DYNAMIC);
return OSGLoadResult::Sucess;
}
// since load failed, reset the wait event so the render thread
resumes
return OSGLoadResult::FileLoadError;
}
void OpenSceneGraphBitmap::CleanupModel()
{
RemoveViews();
if (m_Root != nullptr) // if root already exists (already loaded
previous scene) remove children to clean up
{
m_Root->releaseGLObjects();
m_Root->removeChildren(0, m_Root->getNumChildren());
void* ptr = m_Root.release();
delete ptr;
m_Root = nullptr;
}
}
void OpenSceneGraphBitmap::RemoveViews()
{
if (m_nhiCompositeViewer != nullptr)
{
m_nhiCompositeViewer->setDone(true);
delete m_nhiCompositeViewer;
m_nhiCompositeViewer = nullptr;
}
}
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