Hi,
As a solution, I decided to change the viewpoint of the camera and then take
pictures as I change the viewpoint. However, with the code I have, it's really
slow (cow rotates very slowly) Any suggestions or ways I can over come this
problem?
Code:
//capture an image of the scenegraph
class CCameraPostDrawCallback: public osg::Camera::DrawCallback {
public:
CCameraPostDrawCallback(const int cX, const int cY, const int w,
const int h, const std::string str) {
centerX = cX;
centerY = cY;
width = w;
height = h;
fileName = str;
}
void operator () (const osg::Camera& cam) const {
//take a picture of the scene
osg::ref_ptr<osg::Image> screenShot = new osg::Image;
screenShot->readPixels(centerX, centerY, width, height, GL_RGB,
GL_UNSIGNED_BYTE);
osgDB::writeImageFile(*screenShot, fileName);
}
private:
int centerX;
int centerY;
int width;
int height;
std::string fileName;
};
osg::Node* CreateScene() { //add rendering modifications
//load the osg model
osg::Node* loadedModel = osgDB::readNodeFile("cow.osg");
return loadedModel;
}
int main(int argc, char *argv[]) {
osgViewer::Viewer viewer;
viewer.setSceneData(CreateScene());
viewer.getCamera()->setProjectionMatrixAsPerspective(60., 1., 1., 100. );
viewer.setUpViewInWindow(0, 0, 500, 500);
//create a matrix to specify a distance from the viewpoint.
osg::Matrix trans;
trans.makeTranslate(0., 0., -12.);
//Rotation angle (in radians)
double angle(0.);
while (!viewer.done()) {
viewer.getCamera()->setPostDrawCallback(new CCameraPostDrawCallback(0,
0, 500, 500, "screenshot.jpg"));
//Create the rotation matrix.
osg::Matrix rot;
rot.makeRotate(angle, osg::Vec3(1, 0., 0.));
angle += 0.01;
viewer.getCamera()->setViewMatrix(rot * trans);
viewer.frame();
}
}
Thank you!
Cheers,
Ricky
------------------
Read this topic online here:
http://forum.openscenegraph.org/viewtopic.php?p=29188#29188
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