[osg-users] Invisible light points

[Andreas Ekstrand]

Strange, thought the reply-to address was set from osg-users...this was 
what I accidentally sent to Robert only:

Hi Robert,

Thanks for your reply, I realize you're busy with 3.4.1 right now. But 
if you can find the time to look into this I have also attached a simple 
example reproducing the issue in code. Commenting in adding of the geode 
will hide the light points.

/Andreas


On 2017-08-18 11:12, Robert Osfield wrote:
> Hi Andreas,
>
> On 18 August 2017 at 08:30, Andreas Ekstrand 
> <andreas.ekstrand at remograph.com 
> <mailto:andreas.ekstrand at remograph.com>> wrote:
>
>     Did someone manage to reproduce this problem? Any suggestions are
>     welcome, I really don't understand what's happening here...
>
>
> I haven't had a chance to test the issue yet.  In the latest OSG there 
> are rewrites of various parts of the OSG to move fully over to use 
> vertex arrays and supporting VAO's, my guess is this work touched upon 
> osgSim::LightPoint* functionality and introduced a regression, as to 
> what this might be I can't say without reproduce the issue and 
> investigating the related code.
>
> In general the behaviour you describe sounds like vertex array state 
> that is not being set up correctly so the values used by the driver 
> are just the last ones to be set rather than the one intended.
>
> Robert.
>
>
> _______________________________________________
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> osg-users at lists.openscenegraph.org
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#include <map>

#include <osg/ref_ptr>
#include <osg/Vec3>
#include <osg/Vec4>
#include <osg/Group>
#include <osg/Geode>
#include <osg/Geometry>
#include <osgViewer/Viewer>
#include <osgSim/LightPoint>
#include <osgSim/LightPointNode>

int main(int argc, char **argv)
{
  osgViewer::Viewer viewer;
  osg::ref_ptr<osg::Group> topGroup = new osg::Group();

  osg::ref_ptr<osgSim::LightPointNode> lpNode = new osgSim::LightPointNode();
  lpNode->addLightPoint(osgSim::LightPoint(osg::Vec3(-10.0f, 0.0f, 0.0f), osg::Vec4(1.0f, 0.0f, 0.0f, 1.0f)));
  lpNode->addLightPoint(osgSim::LightPoint(osg::Vec3(10.0f, 0.0f, 0.0f), osg::Vec4(0.0f, 1.0f, 0.0f, 1.0f)));
  topGroup->addChild(lpNode);

  osg::ref_ptr<osg::Geode> geode = new osg::Geode();
  osg::ref_ptr<osg::Geometry> geometry = new osg::Geometry();
  osg::ref_ptr<osg::Vec3Array> vertices = new osg::Vec3Array();
  vertices->push_back(osg::Vec3(-1.0f, -1.0f, 0.0f));
  vertices->push_back(osg::Vec3(1.0f, -1.0f, 0.0f));
  vertices->push_back(osg::Vec3(1.0f, 1.0f, 0.0f));
  vertices->push_back(osg::Vec3(-1.0f, 1.0f, 0.0f));
  geometry->setVertexArray(vertices);
  geometry->addPrimitiveSet(new osg::DrawArrays(GL_QUADS, 0, 4));
  geode->addDrawable(geometry);
  //topGroup->addChild(geode);

  viewer.setSceneData(topGroup);
  viewer.realize();
  return viewer.run();
}