This is the result when I remove the helmet. I really don(t understand. The square is obtained thanks to the following way. I ceated a cube with blender 3*3*0.1 (small depth along th Z-axis) I load on that cube a texture. I attach to this mail the result without the helmet and the texture attached to the cube. It's very strange...
2008/6/18 Paul Melis <[EMAIL PROTECTED]>: > Jean-Baptiste Authesserre wrote: > >> Sorry for the previous mail. I'm a little confused. My camera is >> configured to take Y-axis as UP axis. In my 3D-model, I put the helmet so >> that the bottom of the helmet correspond to negative Y, and the top to >> positive Y (cf attached figure). The camera look at (0, 0, 0). Thus I can >> obtain the attached image. To enlight the scene I put the light at 0 on >> X-axis so the region around the bottom corners of the square be enlighten >> the same way (the square is in the XY plane). However the region around >> bottom-left corner is darker than the region around bottom-right corner. >> What have I missed? >> > Ah! You said "my object isn't uniformly enlighten" in your original mail. > With "object" I figured you meant the whole thing/"helmet". I now see what > you mean w.r.t. the dark corner on the square. Could it be that you have an > incorrect normal for that corner of the square? Are the square and helmet > one object? Does it still show when you display only the square (i.e. could > it be an artifact that actually comes from the helmet, and not the square)? > > Paul > >> >> Jean-Baptiste >> >> 2008/6/18 Jean-Baptiste Authesserre <[EMAIL PROTECTED] <mailto: >> [EMAIL PROTECTED]>>: >> >> Hi, >> >> I am a little confused. My camera >> >> 2008/6/18 Paul Melis <[EMAIL PROTECTED] >> <mailto:[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] >> <mailto:[email protected]> >> >> http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org >> >> >> _______________________________________________ >> osg-users mailing list >> [email protected] >> <mailto:[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 >> >> > > _______________________________________________ > osg-users mailing list > [email protected] > http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org >
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