Hi,
Background:
I've written an application in C# for various reasons. SharpGL provided the
OpenGL portion, C# provided the Database, and Intellisense works with it in VS
2010. I've rewritten this application in 3 different frameworks and have hit
issues I could not solve for one reason or another. For example, now that my
application works and I use it everyday, I'm trying to enhance some of its
features, such as loading a 3D object and good text rendering.
I've come across OpenSceneGraph and have been trying to use it with the C#
wrappers. I couldn't get that working and read a bunch of posts providing other
solutions and mentioning it isn't supported anymore. Thus, I've learned to
write a wrapper for a C++ OSG DLL to call some native OSG functions.
It works great, except that it doesn't, LOL. The code it fine, I've tested it
in a sample, non C# application using the viewer and all.
The Question:
The part that I don't understand is how to use OSG to render in an existing
OpenGL viewport. Is there a way to attach to the existing OpenGL instead of
creating the OSG viewer as noted in every OSG example I've seen?
C# SharpGL initialization
Code:
// Initialize SharpGL
void initSharpGL() {
openGLControl = new SharpGL.OpenGLControl();
((System.ComponentModel.ISupportInitialize)(openGLControl)).BeginInit();
//
// openGLControl
//
openGLControl.BitDepth = 32;
openGLControl.Dock = System.Windows.Forms.DockStyle.Fill;
openGLControl.DrawFPS = true;
openGLControl.FrameRate = 60;
openGLControl.Location = new System.Drawing.Point(0, 0);
openGLControl.Name = "openGLControl";
openGLControl.RenderContextType = SharpGL.RenderContextType.FBO;
openGLControl.Size = new System.Drawing.Size(1680, 1060);
openGLControl.TabIndex = 0;
openGLControl.OpenGLInitialized += new
System.EventHandler(openGLControl_OpenGLInitialized);
openGLControl.OpenGLDraw += new
System.Windows.Forms.PaintEventHandler(openGLControl_OpenGLDraw);
openGLControl.Resized += new System.EventHandler(openGLControl_Resized);
openGLControl.Click += new System.EventHandler(OpenGL_Click);
((System.ComponentModel.ISupportInitialize)(openGLControl)).EndInit();
Controls.Add(openGLControl);
...
}
Native OSG Code:
Code:
// Create the scene root
mRoot = new osg::Group;
// The viewer
mViewer = new osgViewer::Viewer;
mWindow = mViewer->setUpViewerAsEmbeddedInWindow(0, 0, 1680, 998);
mViewer->getCamera()->setClearMask(0);
mViewer->setSceneData(mRoot);
mViewer->realize();
osg::ref_ptr<osg::Geode> geode = new osg::Geode;
std::string fontFile("arial.ttf");
font = osgText::readFontFile(fontFile);
if (font.valid()) {
osgText::Text* text = new osgText::Text;
if (text != 0) {
text->setFont(font);
text->setColor(osg::Vec4(0.0f, 1.0f, 1.0f, 1.0f));
text->setCharacterSize(40.0f);
text->setPosition(osg::Vec3(100.0f, 100.0f, 0.0f));
text->setText("SomeSome!");
text->setLayout(osgText::Text::LEFT_TO_RIGHT);
geode->addDrawable(text);
}
}
mRoot->addChild(geode);
The OSG Draw Callback function contents
Code:
mViewer->frame();
Thank you!
Cheers,
Dainon
------------------
Read this topic online here:
http://forum.openscenegraph.org/viewtopic.php?p=49871#49871
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