Hi,
> 5. Because the technique depends on the usage of a vertex shader I would add
> two static methods one returns a basic osg::Program with phong shading and
> another one only returns the shader code with the necessary uniforms and a
> vertex quantization function that should be used in the shader.
Maybe there's an interesting idea in osgEarth : the use pseudo-loaders to
create library-specific objects. It's possible to write a plugin which create
shaders in the following way, by mapping "popgeometry" file extension to a
pseudo-loader. The file name let you know the shader type :
Code:
osg::Shader* vertexShader = osgDB:readShaderFile("vertexShader.popgeometry")
osg::Shader* fragmentShader = osgDB:readShaderFile("fragmentShader.popgeometry")
You can create osg::Node, osg::Shader or any osg::Object subclass with a
plugin, and even add parameters, in the filename or in the "options" parameters
:
Code:
osg::Shader* vertexShader =
osgDB:readShaderFile("vertexShader.lod1.popgeometry")
osg::Shader* vertexShader =
osgDB:readShaderFile("vertexShader.lod2.popgeometry")
osg::Shader* vertexShader =
osgDB:readShaderFile("vertexShader.lod3.popgeometry")
osg::Shader* fragmentShader =
osgDB:readShaderFile("fragmentShader.phong.popgeometry", options)
osg::Shader* fragmentShader =
osgDB:readShaderFile("fragmentShader.flat.popgeometry", options)
osg::Shader* fragmentShader =
osgDB:readShaderFile("fragmentShader.debug.popgeometry", options)
Have a look here, there is a list of all "factory" methods available to plugins
:
http://trac.openscenegraph.org/documentation/OpenSceneGraphReferenceDocs/a01311.html#a78e08a10faa6c81a5c255d14f7c30cd7
And the base class for the plugins :
http://trac.openscenegraph.org/documentation/OpenSceneGraphReferenceDocs/a00658.html
To write a new plugin, an easy way is copy/paste the "ReaderWriterOBJ.cpp" file
from the "obj" plugin, in "ReaderWriterPopGeometry.cpp" and replace all the
code/parameters related to "obj" file format by code to handle "PopGeometry"
objects creation (not from actually files, but using "options" parameters and
your algorithms)
Aurelien
------------------
Read this topic online here:
http://forum.openscenegraph.org/viewtopic.php?p=59104#59104
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