> As far as I can see you're creating 'approx/4' circles each > with 'approx' > vertices. This means that the vertex array contains > '(approx/4)+1 * approx' > vertices but the 'DrawArrays' only displays the first > 'approx' vertices. > > If you change that last line to: > > geom->addPrimitiveSet(new osg::DrawArrays(GL_LINE_LOOP, 0, > approx*(approx/4)+1)); > > you should start to see more what you expect.
Yeah, that's a good start. But probably not perfect as the primitive type is LINE_LOOP. Hard to tell though... When someone gives you code to "draw a sphere" that doesn't work, and there are dozens of ways to draw a sphere, it's difficult to tell what to fix. One way to draw a sphere is to imagine the sphere is a globe and draw circles to represent lines of latitude and longitude. I don't quite see an attempt at this in the code. However, assuming this is the desired end result, then you really want a separate PrimitiveSet for each LINE_LOOP. (Such a lat/long sphere suffers from low approximation near the "equator" and excessive approximation near the "poles". I prefer an alternate sphere rendering algorithm, starting from the 20 triangles of an icosahedrons and repetitively subdividing the triangles until a sufficient approximation is achieved. This type of code is somewhat more complex to write, and consumes more CPU cycles, however. Vanilla OpenGL code for this can be downloaded from www.opengldistilled.com. Maybe at some point I'll adapt it for use with OSG.) Paul Martz Skew Matrix Software LLC http://www.skew-matrix.com 303 859 9466 _______________________________________________ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
