:-) Yes a fake texture can help GLSL shader based issue. Feel free to
migrate the other shadow
technics. And if you like working with PSSM feel free to fix the little
issues we still have. i don't
get the time to work on PSSM for next generation.
/adegli
2007/11/1, Mihai Radu <[EMAIL PROTECTED]>:
>
> Just to make sure I understand the issue: from what you are describing,
> the problem is that non-textured scene is drawn is black.
>
> This is a result of the shader in use, if you are using the one for
> textured objects, it will do a texture access on unit 0, and since there
> is no bound texture the result is vec4(0,0,0,1), that when multiplied to
> any other color value gives black.
>
> This is a result of some polish still needed for ShadowMap, and some of
> the options are:
> - if using non-textured scene, make use of the relevant shader ( by
> setting _shadowTextureUnit to 0, and then init() )
> - set a custom shader and use per-object uniform flag to control color
> application ( this is what I've done for work )
> like this:
> > if (!s_TexturedObject)
> > {
> > color.rgb *= gl_Color.rgb;
> > color.a = gl_Color.a;
> > }
> > else
> > {
> > texColor = texture2D(osgShadow_baseTexture, gl_TexCoord[0].st);
> > color *= texColor;
> > }
> - the most elegant solution :
> create a 'fake' texture with (1,1,1,1) and set it to the root of the
> scene, so that it will texture any object that was not textured, but
> it's superseded by any more localized textures, this way one shader will
> work for all objects.
> This is borrowed from ParallelSplitShadowMap, and I hope I'll have time
> to integrate the same idea in ShadowMap.
>
> Cheers
> Mihai
>
> Chris Denham wrote:
> > I'm getting a problem when assigning a new shadowed scene to the viewer.
> > What seems to happen is that once the first scene has been rendered,
> > the assignment of a new shadowed scene results in a everything in the
> > scene being drawn black. Also odd is the fact that there doesn't seem
> > to be a problem when a texture is assigned to objects being drawn.
> >
> > I have created a minimal example that exhibits the problem, and pasted
> > it below.
> > Any ideas what's going wrong? Can anyone reproduce the effect?
> >
> > [I'm using osg2.2 on windowsXP with Radeon X300 with latest drivers.]
> >
> >
> ----------------------------------------------------------------------------------------------------
> > #include <osg/ShapeDrawable>
> > #include <osg/Geode>
> > #include <osgGA/TrackballManipulator>
> > #include <osgShadow/ShadowedScene>
> > #include <osgShadow/ShadowMap>
> > #include <osgDB/ReadFile>
> > #include <osgViewer/Viewer>
> >
> > const int ReceivesShadowTraversalMask = 0x1;
> > const int CastsShadowTraversalMask = 0x2;
> >
> > osg::Node* createShadowedScene(bool withTexture)
> > {
> > osgShadow::ShadowedScene* shadowedScene = new
> osgShadow::ShadowedScene;
> >
> shadowedScene->setReceivesShadowTraversalMask(ReceivesShadowTraversalMask);
> >
> shadowedScene->setCastsShadowTraversalMask(CastsShadowTraversalMask);
> > shadowedScene->setShadowTechnique(new osgShadow::ShadowMap());
> >
> > osg::LightSource* lightSource = new osg::LightSource;
> > lightSource->getLight()->setPosition(osg::Vec4(0, 0.2, 1, 0));
> >
> > osg::ShapeDrawable * shape = new osg::ShapeDrawable(new
> > osg::Sphere(osg::Vec3(0.0f, 0.0f, 0.0f), 200.0));
> > shape->setColor(osg::Vec4(0.8f, 0.8f, 0.8f, 1.0f));
> > osg::Geode* geode = new osg::Geode();
> > geode->addDrawable(shape);
> >
> > if (withTexture)
> > {
> > geode->getOrCreateStateSet()->setTextureAttributeAndModes( 0,
> > new osg::Texture2D(osgDB::readImageFile("Images/lz.rgb")),
> > osg::StateAttribute::ON);
> > }
> >
> > shadowedScene->addChild(geode);
> > shadowedScene->addChild(lightSource);
> >
> > return shadowedScene;
> > }
> >
> > int main(int argc, char** argv)
> > {
> > bool withTexture = false;
> >
> > osgViewer::Viewer viewer;
> > viewer.setThreadingModel(osgViewer::Viewer::SingleThreaded);
> > viewer.setCameraManipulator(new osgGA::TrackballManipulator());
> > viewer.realize();
> >
> > viewer.setSceneData(createShadowedScene(withTexture));
> > #if 1
> > // Drawing the frame then assigning a new shadowed scene
> > // seems to result in scene being rendered black.
> > // Although, seems ok when texture is assigned to the object.
> > viewer.frame();
> > viewer.setSceneData(createShadowedScene(withTexture));
> > #endif
> >
> > viewer.run();
> >
> > return 0;
> > }
> >
> > #endif
> > _______________________________________________
> > osg-users mailing list
> > [email protected]
> >
> http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
> >
> _______________________________________________
> osg-users mailing list
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>
--
********************************************
Adrian Egli
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