Hi Clay, I don't have any object to making computeIntersections() virtual. The only sticking point is there are a collection of different computerIntersections() methods with different parameters, you'd need to override all of these. What may be a better solution would be to change the underlying intersection method - they effectively all currently use the LineSegmentIntersector. I don't know how you are changing the intersection order, so really don't know if this side of things should be abstracted away.
Robert. On 7 March 2014 14:25, Clay Alberty <[email protected]> wrote: > My main View class (extending osgViewer::View indirectly) uses a custom > ordering to determine how objects in the scene are selected when a user > e.g. clicks a mouse button. I'm using one of the osg Draggers in a scene, > and in its handle method it invokes View::computeIntersections to determine > which node was clicked first, but this does not always agree with the > custom selection routine. As a result, clicking on the dragger when it is > behind an object with a lower-priority selection order does not select the > dragger and so does not work as intended. > > My first thought was to override the base View::computeIntersections > method to reflect the custom logic elsewhere in the View class, but it is a > non-virtual method. Is there a particular reason this is so? As a > work-around, I overrode the handle method in the dragger, copied most of > the code from the original implementation, and changed the selection order > there to reflect the custom View logic, but this feels like an ugly > solution. Is there a better way of approaching a universal implementation > of a custom selection order, or can View::computeIntersections be marked > virtual? > > I'm using osg version 2.9.7, but I see the method is still non-virtual in > the 3.3.0 branch. > > Thanks! > > -- > Clay Alberty > Stellar Science > 443-550-1151 > > > _______________________________________________ > osg-users mailing list > [email protected] > http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org >
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