On 4/9/2011 2:44 PM, Rusty Shackleford wrote: > Hi, > I'm working on a tool that visualizes a spacecraft in orbit around a > planetary body. As it is set up now, the position of that spacecraft is given > relative to the center of the body as an x,y,z coordinate. What I'm trying to > do right now is set up a simple altimeter that looks essentially like a ruler > reaching from the planetary surface up to a little past the spacecraft. That > is, a straight line with perpendicular lines crossing it at regular intervals.
Is this a 3D thing that lives in the world with the spacecraft, or a 2D thing on screen? If it's 2D, there's an example called osgScalarBar that might be a starting point to gain inspiration from. > I'm VERY new at OSG (two weeks in) so I could be going about this completely > wrong, please let me know if so. What needs to happen is for the altimeter to > follow the spacecraft (position given by "end" in the code) such that the > central line always intersects it and the origin stays at the center of the > planet (given by "start"). You can turn off lighting as a stateset to make it always remain fully lit. Osg Text has Autotransform capabilities built in to keep it always facing the camera. -- Chris 'Xenon' Hanson, omo sanza lettere. [email protected] http://www.alphapixel.com/ Digital Imaging. OpenGL. Scene Graphs. GIS. GPS. Training. Consulting. Contracting. "There is no Truth. There is only Perception. To Perceive is to Exist." - Xen _______________________________________________ osg-users mailing list [email protected] http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
