[osg-users] Camera and light problem
Thanks Vincent for your answer.
I tried to follow your suggestion, but the problem persists.
If you look at the code, I have :
|_root
---|_modelGraph
---|transform
-|lightsource
-|geode
Any suggestions ? What are my mistakes?
My goal is to have a model moving with the camera and a light represented by
a sphere that does not move (fixed coord).
Just one precision: when I place the light in the scene, the light
coordinates depends of the model: ((0,0,0) puts the light inside the model)
Could this explain the problem?
How can I prevent this?
Thanks again.
{
//_modelGraph group represents the current scene
//_root group will contains _modelGraph plus the light
//create the light
osg::ref_ptrosg::Light light = new osg::Light;
//make the light a point light by setting w to 1.0
light-setPosition(osg::Vec4(-10.0f, -10.0f, 0.0f, 10.0f));
//create a lightsource for the light
osg::ref_ptrosg::LightSource lightSource = new osg::LightSource;
//create a transformation node that will move the node in the scene
osg::ref_ptrosg::MatrixTransform transform = new osg::MatrixTransform;
transform-addChild(lightSource.get());
//Position the light
osg::Vec3 pos(-5.0f, 10.0f, 0.0f);
transform-setMatrix(osg::Matrix::translate(pos));
//create a small sphere to represent the lights position
osg::ref_ptrosg::Geode geode = new osg::Geode;
osg::ref_ptrosg::TessellationHints hints = new osg::TessellationHints;
hints-setDetailRatio(0.3);
osg::ref_ptrosg::ShapeDrawable shape = new osg::ShapeDrawable(new
osg::Sphere(osg::Vec3(0.0f, 0.0f, 0.0f), 0.6f), hints.get());
shape-setColor(lightColor);
geode-addDrawable(shape.get());
transform-addChild(geode.get());
_root-addChild(transform.get());
//add the model to the light's root group
_root-addChild(_modelGraph.get());
}
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Re: [osg-users] thousand spheres
Hi, I have used OSG in the past to create the visuals aspects of a huge scale network simulator (up to 2 nodes). So if you detail more your problem may be I can help. I created my nodes instances with a simple 'for' loop, placing each one either using a random generator or reading from a configuration file. Cheers, Nicolas. 2008/3/8, wanyama harold [EMAIL PROTECTED]: Hi guys,Iam working on designing a simple network consisting of nodes and links. my only problem is I want nodes in thousands of numbers and i dont want to keep on creating a new instance of a network node(read sphere). how can i write a function that can use randomness to achieve these many nodes? I hope am clear. thx ___ Rise to the challenge for Sport Relief with Yahoo! For Good http://uk.promotions.yahoo.com/forgood/ ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
[osg-users] Saving and Loading Scenes
Hi, I need some help on saving and loading scenegraphs. Reading the OSG documentation, specifically the osgDB namespace, I saw that I have no idea where to begin! Can someone give me a reference? Thanks, Renan M Z Mendes ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] Saving and Loading Scenes
On Saturday 08 March 2008 at 13:50:04, Renan Mendes wrote: Hi, I need some help on saving and loading scenegraphs. Reading the OSG documentation, specifically the osgDB namespace, I saw that I have no idea where to begin! Can someone give me a reference? Thanks, Renan M Z Mendes Hello Renan, I think you start with osgDB::writeNodeFile [1]. With that function you can write a whole scene graph into a .osg file for example. Regards, Benjamin [1] http://www.openscenegraph.org/documentation/OpenSceneGraphReferenceDocs/a02205.html#a63 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] Saving and Loading Scenes
Benjamin, I've used this function (it compiled alright), but when running my aplication, there was an error message, saying that I didn't have the plugin for reading and writing files... I went to the OSG website and searched for reading and writing plugins, but there were so many, I didn't know which one to choose. Do you have a suggestion? Renan M Z Mendes ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] Saving and Loading Scenes
On Saturday 08 March 2008 at 14:26:13, Renan Mendes wrote: Benjamin, I've used this function (it compiled alright), but when running my aplication, there was an error message, saying that I didn't have the plugin for reading and writing files... I went to the OSG website and searched for reading and writing plugins, but there were so many, I didn't know which one to choose. Do you have a suggestion? Renan M Z Mendes Hello Renan, the plugin is selected by the filename you give to this function. For writing files, I think the OpenSceneGraph format (file extenstion .osg) is the only one which supports most of the nodes. So you should call the function with something like MySceneGraph.osg as filename. If it still complains about missing plugins maybe the plugins where not installed correctly. If you are using GNU/Linux and have installed OpenSceneGraph to /usr then there should be a directory called /usr/lib/osgPlugins-2.2.0 containing the plugins (if you installed version 2.2.0 of course). Regards, Benjamin ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] thousand spheres
Hi Nicholas, thanxs. i would like more details becoz thats exactly what i want. i thought of the for loop but dint know how to simply implement. i would be grateful if u could show me how. Hi, I have used OSG in the past to create the visuals aspects of a huge scale network simulator (up to 2 nodes). So if you detail more your problem may be I can help. I created my nodes instances with a simple 'for' loop, placing each one either using a random generator or reading from a configuration file. Cheers, Nicolas. __ Sent from Yahoo! Mail. The World's Favourite Email http://uk.docs.yahoo.com/nowyoucan.html ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
