Hi Thorsten, No, I don't think gl_Vertex.z will give you the cloud altitude. That's just the vertex position relative to the sprite center. glColor is used to pass in the sprite location relative to the cloud center, and the Model Matrix places the cloud relative to the rest of the scene.
I don't think the Model matrix will help you much either, as IIRC (0,0,0) is the center of the earth spheroid. What do you need it for? sunrise/sunset lighting? As it happens, the Impostor changes will reduce the number of variables required by the shader significantly, so I could add it in as an additional variable if it would be useful. -Stuart On Mon, Jan 9, 2012 at 8:08 AM, <thorsten.i.r...@jyu.fi> wrote: > > Hi Stuart, > > is gl_Vertex.z a reasonably approximate guess for the altitude in which > the cloud finally appears or do I have to look elsewhere? There's lots of > reshuffling of the vertex coordinates going on in the shader, and I've > kind of lost track a bit... > > * Thorsten > > > ------------------------------------------------------------------------------ > Ridiculously easy VDI. With Citrix VDI-in-a-Box, you don't need a complex > infrastructure or vast IT resources to deliver seamless, secure access to > virtual desktops. With this all-in-one solution, easily deploy virtual > desktops for less than the cost of PCs and save 60% on VDI infrastructure > costs. Try it free! http://p.sf.net/sfu/Citrix-VDIinabox > _______________________________________________ > Flightgear-devel mailing list > Flightgear-devel@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/flightgear-devel ------------------------------------------------------------------------------ Ridiculously easy VDI. With Citrix VDI-in-a-Box, you don't need a complex infrastructure or vast IT resources to deliver seamless, secure access to virtual desktops. With this all-in-one solution, easily deploy virtual desktops for less than the cost of PCs and save 60% on VDI infrastructure costs. Try it free! http://p.sf.net/sfu/Citrix-VDIinabox _______________________________________________ Flightgear-devel mailing list Flightgear-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/flightgear-devel
