virtual ViewDependentShadowTechnique::ViewData * initViewDependentData \
( osgUtil::CullVisitor *cv, ViewDependentShadowTechnique::ViewData * vd ) \
{ \
TechniqueData* td = dynamic_cast<TechniqueData*>( vd ); \
if ( !td ) td = new TechniqueData; \
td->init( this, cv ); \
return td; \
}
META_ViewDependentShadowTechniqueData macro defines initViewDependentData method used by derived shadow techniques to initialize their specific ViewData objects. initViewDependentData will be called from ViewDependentShadowTechnique base class to init derived class