Hi Sebastian,
Thanks for the detailed explanation and the hints regarding texture/world
coordinates. I've tried binding at the tile level as you suggested, but
apparently the additional data source is not fast enough to be used at
real-time.
At this point, I'm going to have the original terrain model regenerated with
two textures for each tile, instead of constructing the second texture on the
fly. As far as I understand, binding a second texture should be possible with
the OSG and TXP formats.
So thanks again for attempting to help with issue.
Best,
Shahar
Sebastian Messerschmidt wrote:
> You don't really need to bind at a level this deep. Usually if the
> "terrain tile" is loaded and represent a LOD you want to work with, you
> can simple add your data texture(s) as uniform to the stateset of the tile.
> Given you have a texture with the data-image called "texture" you can do
> it this way in your callback:
>
> osg::StateSet* state_set = node->getOrCreateStateSet();
> osg::Uniform* sampler = new osg::Uniform("MyDataSamper", 2
> /*texture unit*/);
>
> state_set->setTextureAttribute(unit, texture ,osg::StateAttribute::ON);
> state_set->addUniform(sampler);
>
> With this you bind the texture to a sampler for your shader, at the
> texture unit 2. Depending on how many textures are already bound you
> might need to modify the unit.
> In the fragment shader you can now access the texture via:
>
> uniform sampler2D MyDataSampler
> ..
> ..
>
> main()
> {
> vec2 tex_coord = gl_TexCoord[0].st;
> vec4 data = texture2D(MyDataSampler, tex_coord);
> }
>
------------------
Read this topic online here:
http://forum.openscenegraph.org/viewtopic.php?p=55008#55008
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