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
------------------------------------------------------------------------------
Live Security Virtual Conference
Exclusive live event will cover all the ways today's security and
threat landscape has changed and how IT managers can respond. Discussions
will include endpoint security, mobile security and the latest in malware
threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/
_______________________________________________
Opensg-users mailing list
Opensg-users@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/opensg-users
