Hi,
for my tests I want to center the bounding box of a scene in a
ortho2d view but with the following
code the scene is shifted and the view doesn't entirely display it.
I use this node visitor to compute the bounding box of all the active
drawables:
class BBoxNodeVisitor : public osg::NodeVisitor
{
osg::BoundingBox bb;
public:
BBoxNodeVisitor() : bb(), osg::NodeVisitor
(TRAVERSE_ACTIVE_CHILDREN) {}
virtual void apply(osg::Geode &searchNode) {
int numberOfDrawables = searchNode.getNumDrawables();
for (int i = 0; i < numberOfDrawables; i++) {
bb.expandBy(searchNode.getDrawable(i)->getBound());
}
traverse(searchNode);
}
const osg::BoundingBox &getBoundingBox() const { return bb; }
};
and this code to setup the orthographic view.
I've also tried expanding a BoundingBox from the bounding sphere of
the scene data
(theViewer->getSceneData()->getBound()) with the same results.
osg::BoundingBox bb;
BBoxNodeVisitor bbNodeVisitor;
theViewer->getSceneData()->accept(bbNodeVisitor);
bb = bbNodeVisitor.getBoundingBox();
float xStart, xEnd, yStart, yEnd;
xStart = bb.xMin();
xEnd = bb.xMax();
yStart = bb.yMin();
yEnd = bb.yMax();
float bbWidth = xEnd - xStart;
float bbHeight = yEnd - yStart;
// stretch the bounding box to the viewing area
float xScale = bbWidth / view_width;
float yScale = bbHeight / view_height;
if (xScale > yScale) {
float value = ((bbHeight / yScale) * xScale) - bbHeight;
yStart -= value / 2.f;
yEnd += value / 2.f;
}
else {
float value = ((bbWidth / xScale) * yScale) - bbWidth;
xStart -= value / 2.f;
xEnd += value / 2.f;
}
theViewer->getCamera()->setProjectionMatrixAsOrtho2D(xStart,
xEnd, yStart, yEnd);
Any hints? What have I missed? (osg 2.1.12)
I have used osgviewerCocoa as a base to setup the osg view.
Thank you.
--
Ciao,
Mirko
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