Hi Brad, I've just test osgsimulation with your data and see the issue you are observing. Looking at the source data itself - its a small 100 by 100 rectangle that goes through the center of the earth. This is very much a case that OverlayNode is not designed for, and not one that it will every be able to handle as how you project this onto the sphere is rather debatable.
When working with geocentric (Earth Centered Earth Fixed) database OverlayNode is designed to project geometry that it iself in ECEF objects towards the earth center. The handling of data goes through the center of the earth is not supported, so undefined will result which is why you get two different results with slightly different data - both are invalid even the one that produces an overlay. Now there may be still be an issue with handling flat data which is sat properly on the earths surface, or projecting of a flat objects in a regular XYZ non geocentric coordinate system, but we'll need to produce new data to set this out. The output of the overlay technique to the commandline is certainly not appropriate for stable release so I've change this debug message to INFO. This is now checked into SVN and will make it into todays dev release. Robert. On 8/6/07, Christiansen, Brad <[EMAIL PROTECTED]> wrote: > Hi, > > I have just started using the OverlayNode in osg::Sim (from the 2.0 > release) and have come accorss an issue. If the items in the overlay > subgraph are purely 2D objects then nothing is rendered to the overlay > at all. My guess is that the near and far values are both being > calculated as 0. There doesn't seem to be any way to get access to the > CameraNode to fix this issue. > > The problem can be easily reproduced by running the osgsimulation > example with the attached files: > > osgsimulation --overlay FlatRect.osg (nothing appears on the 'earth') > > osgsimulation --overlay NonFlatRect.osg (works fine) > > The attached files define a simple rectangle, FlatRect has no y > component (ie is 2D) while NonFlatRect does. At the momemnt I am simply > working around the issue by adding a couple of dummy points to my > overlay scene to give it some depth. > > I havent looked in to this but neither file works if ortho mode is used. > I don't have this problem in my application however. > > As a side note, by default the Overlaynode also prints a notify to the > screen stating which mode it uses (ie OverlayNode::init() - > OBJECT_DEPENDENT_WITH_ORTHOGRAPHIC_OVERLAY). This should probbaly be > swiched off by default if it hasn't already been in the latest svn > version. > > Cheers, > > Brad > > > > DISCLAIMER:--------------------------------------------------------------------------- > This Email may contain confidential and/or privileged information and is > intended > solely for the addressee(s) named. If you have received this information in > error, or > are advised that you have been posted this Email by accident, please notify > the > sender by return Email, do not redistribute it, delete the Email and keep no > copies. > -------------------------------------------------------------------------------------- > > > _______________________________________________ > osg-users mailing list > [email protected] > http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org > > > _______________________________________________ osg-users mailing list [email protected] http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
