Zoom to mouse makes map disappear

[OlaRune]

Using the following earth file:

<map>
    <options>
	<profile>spherical-mercator</profile>
    </options>
    <GDALImage name="World">
        <url>../geodata/world.tif</url>
    </GDALImage>
</map>

Using the following code:

#define NOMINMAX // To force windows.h to not define macros that interfere with std::min and std::max
#include <windows.h> // Needed by openGL

#include <osgDB/ReadFile>

#include <osgEarth/MapNode>
#include <osgEarth/EarthManipulator>
#include <osgViewer/Viewer>
#include <osgEarth/GLUtils>

int main()
{
	osgEarth::setNotifyLevel(osg::INFO); // FATAL WARN NOTICE INFO DEBUG_INFO
	std::string earthPath = "world_spherical_mercator.earth";
	osgEarth::MapNode* mapNode = osgEarth::MapNode::get(osgDB::readNodeFile(earthPath));

	// Setup viewer
	osgViewer::Viewer* viewer = new osgViewer::Viewer();
	osgEarth::GLUtils::setGlobalDefaults(viewer->getCamera()->getOrCreateStateSet());
	viewer->setUpViewInWindow(0, 0, 1024, 768);
	viewer->setSceneData(mapNode);

	osg::ref_ptr<osg::Camera> camera = viewer->getCamera();
	osgEarth::GLUtils::setGlobalDefaults(camera->getOrCreateStateSet());
	camera->setDrawBuffer(GL_BACK);
	camera->setReadBuffer(GL_BACK);
	double left = 0.0;
	double right = left + 1024.0;
	double bottom = 0.0;
	double top = bottom + 768.0;
	double zNear = 1.0;
	double zFar = 100000000.0; // Not sure what value is reasonable here to be able to zoom far out, but it doesn't seem to affect my problem
	camera->setProjectionMatrixAsOrtho(left, right, bottom, top, zNear, zFar);

	// Setup manipulator
	osg::ref_ptr<osgEarth::EarthManipulator> manipulator = new osgEarth::EarthManipulator();
        manipulator->getSettings()->setZoomToMouse(true); // For some reason this makes the map disappear when zooming out
	viewer->setCameraManipulator(manipulator);

	return viewer->run();
}

When zooming out too far the map disappears, but grabbing it with LMB and panning a bit makes it reappear. Commenting out the setZoomToMouse(true) line fixes the issue. The issue is only present when zooming out with the scroll wheel, zooming out with double right click works as intended.

If I skip defining my own projection matrix the map doesn't disappear, but instead locks up when zooming out too far, and doesn't let me zoom back in. Any ideas? Is there a problem with the calculations for zoom to mouse, or am I doing something wrong?

[gwaldron]

There may be issues with zoom-to-mouse in orthographic mode. One workaround may be to call manipulator->setMinMaxDistance() to restrict how far out you can zoom.

We also pushed a patch that was preventing zoom-to-mouse from doing anything in ortho mode. It still doesn't seem to actually zoom to the mouse.

[OlaRune]

There may be issues with zoom-to-mouse in orthographic mode. One workaround may be to call manipulator->setMinMaxDistance() to restrict how far out you can zoom.

We also pushed a patch that was preventing zoom-to-mouse from doing anything in ortho mode. It still doesn't seem to actually zoom to the mouse.

Thanks! I'll just not use zoom to mouse for now.

Just to let you know it seems to zoom to mouse correctly with an orthographic matrix for me, using the latest released version of OSG Earth. I just have the disappearing issue..