[osg-users] Texture projection on terrain and gl_TextureMatrix[0...7]

[Sebastian Messerschmidt]

Hello Ekaterinam,

> Thank you very much for your answers!
>
> Sebastian, according to your last answer, does it mean that it is also possible to project a texture on top of an object which has some other textures in it? Which unit for a texture should then I use?
>
> What I want to realize, is to mark on the terrain a specific area.
> The terrain was build with VPB and seems it has alredy some properties and textures in it.
> The way how I see it I should project a texture on it ( which will mark an area). But in all small examples I didn´t find and didn´t manage to have a texture on another texture ( that it is still possbile to see both of them).

You might consider using a visitor to check which texture units are 
already bound, but I guess if the Database is build with VPB, unit 2 is 
okay for starting. Using a shader you are less bound to which 
fixed-function texture matrix/coordinates are used.

Cheers
Sebastian

>
>
> Thank you!
>
> Cheers,
> Ekaterina
>
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> http://forum.openscenegraph.org/viewtopic.php?p=70072#70072
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