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.
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