Hi,
I would like to fill the depth buffer with the data of a rendered subgraph. The
subgraph itself should not be visible in the view. Afterwards, I want to render
another - and now visible - subgraph that uses (and modifies) the previously
filled depth buffer.
How can I do this?
I wrote a small program for testing but unfortunately this does not fill the
depth buffer (the box is completely visible):
Code:
osg::Geode* geode(new osg::Geode());
osg::Program* prog(new osg::Program());
osg::Shader* vshader(new osg::Shader(osg::Shader::VERTEX,
gVertexShader));
osg::Shader* fshader(new
osg::Shader(osg::Shader::FRAGMENT,gFragmentShader));
osg::ShapeDrawable* box(new osg::ShapeDrawable(new
osg::Box(osg::Vec3(0,0,0),100.0)));
osg::ShapeDrawable* sphere(new osg::ShapeDrawable(new
osg::Sphere(osg::Vec3(50.0,50.0,50.0),100.0)));
prog->addShader(vshader);
prog->addShader(fshader);
box->getOrCreateStateSet()->setAttribute(new
osg::ColorMask(true,true,true,true));
sphere->getOrCreateStateSet()->setAttribute(new
osg::ColorMask(true,false,false,true));
sphere->getOrCreateStateSet()->setAttribute(new osg::Depth());
geode->addDrawable(box);
geode->addDrawable(sphere);
geode->getOrCreateStateSet()->setAttribute(prog);
_root->addChild(geode);
Thank you!
PS: The vertex shader just calculates the position by multiplying the
view-projection matrix with the vertex vector and the fragment shader just
returns a color value.
Cheers,
Hartwig
------------------
Read this topic online here:
http://forum.openscenegraph.org/viewtopic.php?p=69698#69698
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