Hallo,
Imagine I have following situation of classes:
osg::Object
/ \
/ \
Base osgText::Text
| |
| |
\ /
\ /
DerivedText
I know, this is so called diamond polymorphism, which
is sometimes not good. However in my case I need such
a structure or better to say, there is no elegant way
to go around this.
Now I have specified my own ReaderWriter to serialize
the content of the DerivedText into a file. The format
is very similar to the .osg file format, hence I
decided to use osgdb_osg plugin to write information
about osgText::Text into this file.
This is done by calling:
osgDB::ReaderWriter* rw =
osgDB::Registry::instance()->getReaderWriterForExtension("osg");
rw->writeObject(static_cast<const
osgText::Text&>(*derivedText), fout);
Using this there is no information written by the
plugin to the output stream.
The problem here is, that the call of
static_cast<const
osgText::Text&>(*derivedText).className() returns the
name, which is given back by the
DerivedText::className() method and not the one given
back by the osgText::Text::className() and therefor
the Registry::writeObject() method can not find
appropriate DotOsgWrapper for this.
One could solve this by manually retrieving the
DotOsgWrapper from the osgDB::Registry. However there
is no such method like
osgDB::Registry::getDotOsgWrapper() method defined.
The counterpart to this, namely addDotOsgWrapper,
method exist.
Is meant to be so, or is it a feature which we could
need?
Thanks in advance.
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