Hi martin,
what kind of 3d database do you like to visualize with shadow? and what kind
of light are you using. if your scene is a terrain like database, you can
have a look at parallel split shadow map. if you have a small scene, than
you can visualise with static shadow. but it the scene is too big for high
quality shadow, it would be better to use a PSSM or frustum base shadow map,
otherwise it's not sure that you don't have enough resolution.
regards
adrian
2008/6/19 "Martin Großer" <[EMAIL PROTECTED]>:
> Hello,
>
> first, I have a general question. If you want to use shadows in you scene,
> would you use the shadow volumes or the shadow maps?
> I use the shadow maps from the osgShadow nodekit. But the normal ShadowMap
> is unaesthetic and when I use the softShadowMap, my application runs very
> slowly. And my idea is a static ShadowMap, which create once at the
> beginning and save this as ImageFile.
>
> Here is my source code, but it doesn't work.
>
> // ShadowTexture erstellt (leer)
> _texture = new osg::Texture2D;
> _texture->setTextureSize(TEXTURE_SIZE_X, TEXTURE_SIZE_Y);
> _texture->setInternalFormat(GL_DEPTH_COMPONENT);
> _texture->setShadowComparison(true);
> _texture->setShadowTextureMode(osg::Texture2D::LUMINANCE);
> _texture->setFilter(osg::Texture2D::MIN_FILTER,osg::Texture2D::LINEAR);
> _texture->setFilter(osg::Texture2D::MAG_FILTER,osg::Texture2D::LINEAR);
>
> _texture->setWrap(osg::Texture2D::WRAP_S,osg::Texture2D::CLAMP_TO_BORDER);
>
> _texture->setWrap(osg::Texture2D::WRAP_T,osg::Texture2D::CLAMP_TO_BORDER);
> _texture->setBorderColor(osg::Vec4(1.0f,1.0f,1.0f,1.0f));
>
> // Kamera für das PreRendering einstellen
> {
> // Kamera erstellen
> osg::ref_ptr<osg::Camera> _camera = new osg::Camera;
>
> // Kamera konfigurieren
>
> _camera->setReferenceFrame(osg::Camera::ABSOLUTE_RF_INHERIT_VIEWPOINT);
> //_camera->setCullCallback(new CameraCullCallback(this));
> _camera->setClearMask(GL_DEPTH_BUFFER_BIT);
> _camera->setClearColor(osg::Vec4(1.0f,1.0f,1.0f,1.0f));
>
> _camera->setComputeNearFarMode(osg::Camera::DO_NOT_COMPUTE_NEAR_FAR);
>
> // Viewport in Texturegröße erstellen
> _camera->setViewport(0,0,TEXTURE_SIZE_X,TEXTURE_SIZE_Y);
>
> // PreRendering einstellen
> _camera->setRenderOrder(osg::Camera::PRE_RENDER);
>
> // Kamera soll OpenGL Frame Buffer Object nutzen
>
> _camera->setRenderTargetImplementation(osg::Camera::FRAME_BUFFER_OBJECT);
>
> // hänge die Texture als Buffer an die Kamera
> _camera->attach(osg::Camera::DEPTH_BUFFER, _texture.get());
>
> _camera->addChild(_scene.get());
>
>
> osgDB::writeImageFile(*(_texture->getImage()),"test.bmp");
> }
>
>
> What is my mistake? Or have anyone a idea, whether I can create a static
> shadow with the osgShadow nodekit?
>
> Cheers,
>
> Martin
> --
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--
********************************************
Adrian Egli
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