Hi, all,
I want to use two cameras to composite result in the same window,
so two slave cameras are used with an projection offset .
However, there is a distortion, e.g, a ball looks like an ellipse.
And I find that osgViewer::Viewer::adSlave(.) doesn't work properly by
itself.
Here is simple example to demo this problem, it's obvious that a ball is
distorted.
==============================================================
#include <osgViewer/Viewer>
#include <osgDB/ReadFile>
#include <osg/GraphicsContext>
#include <osg/Camera>
#include <osg/ShapeDrawable>
#include <iostream>
osg::GraphicsContext* createGraphicsContext(int x, int y,
int width, int height ){
osg::ref_ptr<osg::GraphicsContext::Traits> traits =
new osg::GraphicsContext::Traits;
traits->x = x;
traits->y = y;
traits->width = width;
traits->height = height;
traits->windowDecoration = true;
traits->doubleBuffer = true;
traits->sharedContext = 0;
osg::ref_ptr<osg::GraphicsContext> gc =
osg::GraphicsContext::createGraphicsContext(traits.get());
if(gc.valid()){
gc->setClearColor(osg::Vec4(0.2f,0.2f,0.0f,1.0f));
gc->setClearMask(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
}
return gc.release();
}
osg::Camera* setupCamera(osg::GraphicsContext* gc) {
int width,height;
width = gc->getTraits()->width;
height = gc->getTraits()->height;
GLenum buffer = gc->getTraits()->doubleBuffer ? GL_BACK : GL_FRONT;
osg::ref_ptr<osg::Camera> camera = new osg::Camera;
camera->setGraphicsContext(gc);
camera->setViewport(0,0,width,height);
camera->setDrawBuffer(buffer);
camera->setReadBuffer(buffer);
return camera.release();
}
osg::Node* createBall() {
osg::ref_ptr<osg::ShapeDrawable> drawable = new osg::ShapeDrawable;
drawable->setShape(new osg::Sphere(osg::Vec3f(0,0,0), 10));
osg::ref_ptr<osg::Geode> geode = new osg::Geode;
geode->addDrawable(drawable.get());
return geode.release();
}
int main(int argc, char* argv[]){
osgViewer::Viewer viewer;
viewer.addSlave(setupCamera(createGraphicsContext(0,0,800,600)));
//viewer.setCamera(setupCamera(createGraphicsContext(0,0,800,600)));
viewer.setSceneData(createBall());
viewer.run();
return 0;
}
===================================================================
So, where is the problem? And how to handle it?
Any advice will be appreciated.
--
Bob
_______________________________________________
osg-users mailing list
[email protected]
http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
