It looks like vista will have a more integrated 3-d and vector graphics API built into the system, this is probably some kind of incarnation of directX. Vista will have Windows Graphics Foundation as part of the OS. This should allow for much better graphics capabilities in future releases of Windows based Labview. If you are planning to port your graphics to multiple OS platforms, OpenGL is much less platform dependent. It the current state of things, 3-d graphics are not a common feature of labview applications but this might all be changing. I would love to see a graphics toolkit similar to many gaming engines which could be added to labview in the future (including physics models as well as rendering capabilities). I found openGL to be a more comprehensible API and still have not understood the DirectX interface yet. For the present OpenGl might be easier to use within Labview but this could change with the release of longhorn/Vista (don't expect to be mainstream until 2007 in my estimation). Good luck with the 3D graphics,
Paul