Hi Robert, I'm starting to suspect maybe the osga loader or maybe OSG (cvs). As I mentioned before the database appears correct when generated and viewed from OSG v1.0 but when I try to view the v1.0 database in OSG (cvs) I get the same result of blackness wherever alpha < 1.0.
I'll keep poking around, but feel free to let me know if I'm on a wild goose chase ;) . Thanks, Brad --- RSC BDC > -----Original Message----- > From: [EMAIL PROTECTED] [mailto:osg-users- > [EMAIL PROTECTED] On Behalf Of Robert Osfield > Sent: Wednesday, September 06, 2006 12:40 PM > To: osg users > Subject: Re: [osg-users] OSGDEM database is black where alpha < 1.0 > > Hi Brad, > > Its a while since I did any RGBA work with osgdem as almost all the data I > have to push through it is simple RGB. I do think once I had RGBA working > though... Anyway you'll be on a "not heavily used/tested path" of > osgdem/osgTerrain so there may be gotcha's out there. > > I don't think it'll be the compression that is the problem, but perhaps it > could be.. Compression is used by default, but you can turn it off, for > instance try using the --RGBA option. > > If this doesn't solve the problem then we'll need to dig a little deeper. > > Robert. > > > On 9/6/06, Brad Colbert <[EMAIL PROTECTED]> wrote: > > Hi Folks, > > Has anyone else out there run into this problem: > > I am generating an .osga database using OSGDEM. The imagery has > four > components (Red, Green, Blue, Alpha) but my database is black > wherever > the alpha is < 1.0. What would cause this? Is it texture > compression, > which I hope isn't being used? > > When I use a shader to just show the alpha layer, it's all white. > Showing just one of the color layers shows that they are black where > the > imagery has alphas of < 0.0. > > When I use the same imagery to build a database in OSG 1.0 I get the > alpha values, but loading that database into an application I have > built > against CVS OSG, I get the same black behavior. Strange. Any > ideas? > > -B > > --- > Renaissance Sciences Corporation > O/M: 480 290-3997 > F: 425 675-8044 > > _______________________________________________ > osg-users mailing list > osg-users@openscenegraph.net <mailto:osg-users@openscenegraph.net> > http://openscenegraph.net/mailman/listinfo/osg-users > http://www.openscenegraph.org/ > > _______________________________________________ osg-users mailing list osg-users@openscenegraph.net http://openscenegraph.net/mailman/listinfo/osg-users http://www.openscenegraph.org/
