Hello Christoph,
On 04/25/2012 04:09 AM, "Christoph Fünfzig" wrote:
> I am wondering if separating a ChunkMaterial into two parts might be possible:
> The first containing a SimpleSHLChunk for several childs:
> OSG::SimpleSHLChunkUnrecPtr shl = OSG::SimpleSHLChunk::create();
> shl->setVertexProgram (_vp_program);
> shl->setFragmentProgram(_fp_program);
> // common parameters:
> shl->addUniformVariable("texScale0",
> OSG::Vec2f(1.0f/OSG::Real32(numTiles), 1.0f/OSG::Real32(numTiles)));
> shl->addUniformVariable("texScale1", OSG::Vec2f(1.0f, 1.0f));
> // uniform sampler2D
> shl->addUniformVariable("tex_alpha", 0);
> shl->addUniformVariable("tex_ground", 1);
> shl->addUniformVariable("tex_detail1", 2);
> shl->addUniformVariable("tex_height", 3);
> shl->addUniformVariable("tex_gradient", 4);
>
> and a second containing special variables (scalings, coords) for a specific
> child node:
> OSG::SimpleSHLVariableChunkUnrecPtr shlparam =
> OSG::SimpleSHLVariableChunk::create();
> shlparam->addUniformVariable("texOrigin0",
> OSG::Vec2f(tx/OSG::Real32(numTiles),ty/OSG::Real32(numTiles)));
> shlparam->addUniformVariable("tileCoord", OSG::Pnt2f(tx, ty));
> shlparam->addUniformVariable("tileOrigin", OSG::Pnt2f(-skySize,
> -skySize));
> shlparam->addUniformVariable("decimate", 10.0f);
>
> Is this possible or intended with an ChunkOverrideGroup containing the first?
the shader chunks can be composed with ChunkOverrideGroups (so they
behave a bit odd in the sense that they are not really overridden, but
aggregated instead). I'm not 100% sure if that works with SimpleSHLChunk
or if you need to use ShaderProgramChunk and ShaderProgramVariableChunk.
Gerrit: Can you help out here?
> Does it have benefits to do so?
Your application has to keep track of only one place to change uniform
values for groups of objects.
Cheers,
Carsten
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