Sorry, the second block of flags in my posting should have said this:
useDisplayList FALSE
useVertexBufferObjects TRUE
2014-11-26 15:28 GMT+01:00 Christian Buchner <[email protected]>:
> Hi,
>
> I wrote the following little node visitor to switch part of a scene graph
> from using display lists to using VBOs.
>
> class VBOVisitor : public osg::NodeVisitor
> {
> public:
> VBOVisitor()
> {
> setTraversalMode(osg::NodeVisitor::TRAVERSE_ALL_CHILDREN);
> }
>
> virtual void apply(osg::Node& node)
> {
> osg::Geode *geode = node.asGeode();
> if (geode != NULL)
> {
> for (unsigned int i = 0; i < geode->getNumDrawables(); i++)
> {
> osg::Drawable &drawable = *geode->getDrawable(i);
> drawable.setUseDisplayList(false);
> drawable.setUseVertexBufferObjects(true);
> }
> }
> traverse(node);
> }
> };
>
>
>
> I use it like this before attaching the object to the Viewer and rendering
> it.
>
> osg::Node *object = osgDB::readNodeFile("some_object.osg");
> VBOVisitor vbo;
> object->accept(vbo);
>
>
>
> The OSG file in question contains a lot of Drawbles with the flags
> useDisplayList TRUE
> useVertexBufferObjects FALSE
>
> This prevents advanced rendering techniques such as hardware instancing.
> The idea was to use the VBOVisitor to get the same effect as if I had
> changed these lines to
>
> useDisplayList TRUE
> useVertexBufferObjects FALSE
>
>
> Editing the OSG file manually works, but using the VBOVisitor instead does
> not produce the desired effect (i.e. hardware instancing fails)
>
> What am I missing?
>
> Christian
>
>
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