Hi Andrew,
I guess that the nodes you have disabled small feature culling on is
deep in the scene graph and I suspect that a node higher up in the scene
graph is getting culled by small feature culling. I know of two ways to
get around that problem. One is to disable culling on the node you have
set the callback on, i.e. setCullingActive(false), this will make sure
that the cullvisitor will always visit your node. This might of course
cause a performance penalty if the scene graph is big and deep. The
second approach is to reverse the situation, instead of disabling small
feature culling for specific nodes you disable it globally (i.e. do not
turn small feature culling on) and then you enable it for the subgraphs
that needs it. I wound up doing the later since it was pretty straight
forward for my scene graph and it felt like the best way to do it.
Regards
/Per
Andrew Burnett-Thompson wrote:
Hi Per,
Great example, thanks for taking the time to post this.
Ok I created a class SmallFeatureCullExcluder (inherits NodeCallBack)
and added the code you put in the () operator. I also changed the mask to
cullingSet.setCullingMask(cullingSetMask &
~osg::CullSettings::SMALL_FEATURE_CULLING);
Then I added this as a cull-callback on the Geode I want to exclude.
I'm afraid to say it didn't work, it still gets small feature culled.
Also I tried adding it on the parent (PositionAttitudeTransform) and
as an UpdateCallBack instead of CullCallBack, still no luck.
The code is being reached (I set a breakpoint) but when you zoom out
enough the object gets small-feature culled and the code is not reached.
Any ideas what I may be doing wrong?
Thank you,
Andrew
On Tue, Sep 8, 2009 at 8:07 PM, Per Fahlberg <[email protected]
<mailto:[email protected]>> wrote:
Hi Andrew,
I was trying to accomplish exactly the same and finally found a
solution, if you search the mailing list for "Disabling small
feature culling for a subgraph" you will find the email thread
when I discussed this with Robert. I've pasted the final solution
below for your convinienc.
Regards
/Per
Hi,
For the record I've found a way to get things working the way I
want it, by changing the culling mask of the culling set at the
back of the projection culling stack, small feature culling can
now be both enabled and disabled for subgraphs. The code for my
callback looks like this now (the code is for enabling small
feature culling, change the "|" to "& ~" to disable small feature
culling):
virtual void operator() (osg::Node *node, osg::NodeVisitor *nv)
{
osgUtil::CullVisitor *cv = dynamic_cast<osgUtil::CullVisitor*>(nv);
if(cv){
osg::CullStack::CullingStack &projCullStack =
cv->getProjectionCullingStack();
if(!projCullStack.empty()){
osg::CullingSet& cullingSet = projCullStack.back();
osg::CullingSet::Mask cullingSetMask =
cullingSet.getCullingMask();
cullingSet.setCullingMask(cullingSetMask |
osg::CullSettings::SMALL_FEATURE_CULLING);
traverse(node,nv);
cullingSet.setCullingMask(cullingSetMask);
}else
// Do not really now what to do if it is empty
traverse(node,nv);
}else
traverse(node,nv);
}
Andrew Thompson wrote:
Hi there, and thanks for your response,
well I am using small feature culling in my application to
improve performance. Its a CAD-style app and I have hundreds
of thousands of Geodes on the screen at any one time. Many are
really small so I am throttling small-feature culling to
maintain a decent framerate when moving around. When static
the scene re-draws everything.
But - there are certain objects, markers around the scene, I'd
like to exclude from the small feature cull if possible.
If its not possible, no matter, just was hoping there was a
simple solution to this.
Thank you, Andrew
------------------
Read this topic online here:
http://forum.openscenegraph.org/viewtopic.php?p=17154#17154
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