Hi all,
Sorry to bring up yet another question about
osg::View::setLightingMode(NO_LIGHT), but I'm having trouble understanding some
lighting behavior.
Suppose I have a simple scene with no explicitly-specified StateSets ... e.g.
I'm not setting lights or enabling GL_LIGHTING or anything like that. If I do
viewer.setLightingMode(NO_LIGHT), then as expected the viewer doesn't set up
any light and doesn't enable GL_LIGHTING. If I add a slave camera, then that
slave camera also has no lighting, also as expected.
Now suppose I disable the main camera using
viewer.getCamera()->setGraphicsContext(NULL). Suddenly, the slave camera goes
back to the default headlight! I've searched around and looked through the code
for Renderer and SceneView, but am not able to make sense of this. Can anyone
please explain it?
BTW I'm on the OpenSceneGraph-3.5.6 Git tag.
Thanks!
Ravi
Here's the minimal example code to duplicate this behavior.
Code:
using namespace osg;
int main()
{
// Standard OSG sphere
ShapeDrawable* sphereSD = new ShapeDrawable(new Sphere());
Geode *sphereGeode = new Geode();
sphereGeode->addDrawable(sphereSD);
// Viewer with no light
osgViewer::Viewer viewer;
viewer.setSceneData(sphereGeode);
viewer.setUpViewInWindow(30, 30, 640, 480);
viewer.setLightingMode(View::NO_LIGHT);
// Slave camera
Camera* slaveCam = new Camera();
slaveCam->setViewport(viewer.getCamera()->getViewport());
slaveCam->setGraphicsContext(viewer.getCamera()->getGraphicsContext());
viewer.addSlave(slaveCam);
// Disable main camera
// This causes slaveCam to have default HEADLIGHT: why??
viewer.getCamera()->setGraphicsContext(NULL);
return viewer.run();
}
------------------
Read this topic online here:
http://forum.openscenegraph.org/viewtopic.php?p=72683#72683
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