Hi, I am a little confused. My camera
2008/6/18 Paul Melis <[EMAIL PROTECTED]>: > Jean-Baptiste Authesserre wrote: > >> Hi everyone, >> >> I have some problem with OSG Light, and I don't find answer in the osg >> archives. My problem is the following : I don't understand why with the >> following code my object isn't uniformly enlighten. (cf. image in attached >> document) >> -The black and white square of the image is centered at (0, 0, 0) (in >> world frame with convention (x, y, z)) >> -The camera is located at (0, 0, -20) >> -the light is located at (0,20, -15) >> > If you didn't change this yourself then +Z will be the up axis, btw > >> >> >> The code for activating light is the following: >> >> /***************************** >> ** light *************************************/ >> >> >> //Creation of light source >> osg::Light* light = new osg::Light(); >> osg::LightSource * lightsource = new osg::LightSource(); >> lightsource->setLight(light); >> // put the light source in the scenegraph >> root->addChild(lightsource); >> >> // turn light on >> osg::StateSet * stateset = root->getOrCreateStateSet(); >> lightsource->setStateSetModes(*stateset, osg::StateAttribute::ON); >> light->setAmbient(osg::Vec4d(1.0, 1.0, 1.0, 1.0)); >> //light->setDiffuse(osg::Vec4d(0.0, 0.0, 0.0, 0.0)); >> //light->setSpecular(osg::Vec4d(1.0, 1.0, 1.0, 1.0)); >> light->setPosition(osg::Vec4d(0.0, 20.0, -15.0, 1.0)); >> >> >> /******************************************************************************/ >> >> So, I don't understand why the bottom-left corner of my square is darker >> than the others corners >> > I don't see any difference here between left and right bottom corners, > they're equally dark IMHO. Which seems to make sense, as you've put the > light source above and little in front of the camera, but in the center of > the object (the X plane). > > Paul > >> Has anybody an Idea? >> >> >> Best regards, >> >> Jean-Baptiste. >> ------------------------------------------------------------------------ >> >> _______________________________________________ >> osg-users mailing list >> [email protected] >> http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org >> >> > > _______________________________________________ > osg-users mailing list > [email protected] > http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org >
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