Hi Peter, I would try attaching a single colour entry to the osg::Geometry to see if that makes any difference. Also try toggling lighting on/off to see if that makes any difference.
The only other thing I can think of that might be an issue is mip mapping - are the problem geometries texture mapped? Is so could it be that mip mapping is doing something odd? Try switching off mipmapping for the textures to see. Some OpenGL drivers have bugging mipmapping implementations. Robert. On Wed, Mar 18, 2009 at 4:05 PM, Peter Amstutz <[email protected]>wrote: > It's not erratic, it's pretty strongly correlated to the projection matrix > settings (determining the zoom level), camera distance and size of the icon. > > I looked at the icon model, from inspecting the .osg file (converted from > .ive with osgconv) it appears that the relevant state settings are: > > GL_CULL_FACE ON > GL_LIGHTING ON > GL_NORMALIZE ON > Material { > DataVariance STATIC > ColorMode OFF > ambientColor 1 0 0 1 > diffuseColor 1 0 0 1 > specularColor 0 0 0 1 > emissionColor 0 0 0 1 > shininess 0 > } > From what I can tell from reading the OpenGL documentation and looking at > the OSG code, this means it should ignore any per-vertex colors and just use > the material settings, correct? Does it still need a color array? > > The normals looks fine: > NormalBinding PER_VERTEX > NormalArray Vec3Array 6 > { > 0 0 1 > 0 0 1 > 0 0 1 > 0 0 1 > 0 0 1 > 0 0 1 > } > > The original .ive file was produced using OSGExp with 3D Studio Max 2008 > (the plugin is still using OSG 1.2, though.) I don't have much control > over whether it outputs materials or per-vertex colors, unless I go and > noodle around with the nodes in code after loading them. I suppose I could > modify a file by hand to see if it makes a difference. > > Another thing I noticed is that all the icons go black just before the > camera zooms far enough that the icons are too small to render -- although > in that case, it isn't very noticeable because the icons are already only a > few pixels across on screen. > > Also, I forgot to mention in my previous email but I'm using Open Scene > Graph 2.6.1. > > Thanks, > - Peter > > Robert Osfield wrote: > >> Hi Peter, >> >> Irratic changes of lighting + colour of objects in the scene as your move >> the camera is typically due missing normals or colour arrays on the geometry >> in the scene that is behaving oddly, as these missing arrays will mean that >> their settings will be inherited from geometries that just happen to be >> rendered before them. Have a look at the problem geometry to see if that it >> have any normal or colour arrays, and if they don't add them in. >> >> Robert. >> _____________________________________ >> 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 >
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