Hi Brad, On Tue, Mar 2, 2010 at 9:03 PM, Brad Colbert <[email protected]> wrote:
> Robert, > > I just upgraded everything to 2.9.6. In the process I built one of our > sensor capable databases which relies on data that is in the alpha > channel of the terrain imagery. To my surprise, the terrain was no > translucent. I found that in GeometryTechnique that a stateset is set > for each PagedLOD that enables blending if the image is RGBA. > > I guess my question is if this is absolutely necessary? This is a bit > of a big hammer solution, I think. > Can't the user just enable blending on the osg::Node* that represents > the entire database? > osgTerrain doesn't know that your alpha is not a real alpha, it is simply trying to do the right thing by your data. The fact that you are interpreting alpha in a non standard way, I presume in a shader, suggests that osgTerrain needs extra controls for specifying whether it should require blending or not, or be automatic - i.e. RGB no blending, RGBA to enable blending. VirtualPlanetBuilder would need this option as well. Adding an enum hint into osgTerrain::Terrain would probably be the best way to tackle this, and then add support for this into GeometryTechnique and VirtualPlanetBuilder. Feel free to dive in and implement it :-) Robert.
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