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Code Issues Releases Activity

LP-29 remove AutoClipPlaneHandler (it is not recommended to use it

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See http://forum.osgearth.org/Performance-issue-when-looking-at-horizon-td7588307.html
This commit is contained in:
Philippe Renon 2015-11-11 00:22:57 +01:00
parent 3ee0564421
commit 0a374d2904
1 changed files with 3 additions and 24 deletions
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27
ground/gcs/src/libs/osgearth/osgQtQuick/OSGViewport.cpp
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@ -43,8 +43,6 @@
#include <osgGA/StateSetManipulator>
#include <osgEarth/MapNode>
#include <osgEarthUtil/AutoClipPlaneHandler>
#include <osgEarthUtil/Sky>
#include <QOpenGLContext>
#include <QQuickWindow>
@ -62,7 +60,6 @@ namespace osgQtQuick {
Debugging tips
- export OSG_NOTIFY_LEVEL=DEBUG
Z-fighting can happen with coincident polygons, but it can also happen when the Z buffer has insufficient resolution
to represent the data in the scene. In the case where you are close up to an object (the helicopter)
and also viewing a far-off object (the earth) the Z buffer has to stretch to accommodate them both.
@ -71,11 +68,10 @@ namespace osgQtQuick {
Assuming you are not messing around with the near/far computations, and assuming you don't have any other objects
in the scene that are farther off than the earth, there are a couple things you can try.
One, adjust the near/far ratio of the camera. Look at osgearth_viewer.cpp to see how.
Adjust the near/far ratio of the camera. Look at osgearth_viewer.cpp to see how.
Use LogarythmicDepthBuffer.
Two, you can try to use the AutoClipPlaneHandler. You can install it automatically by running osgearth_viewer --autoclip.
If none of that works, you can try parenting your helicopter with an osg::Camera in NESTED mode,
More complex : you can try parenting your helicopter with an osg::Camera in NESTED mode,
which will separate the clip plane calculations of the helicopter from those of the earth. *
TODO : add OSGView to handle multiple views for a given OSGViewport
@ -197,13 +193,6 @@ public:
osgEarth::MapNode *mapNode = osgEarth::MapNode::findMapNode(node);
if (mapNode) {
qDebug() << "OSGViewport::attach - found map node" << mapNode;
qDebug() << "OSGViewport::attach - set AutoClipPlaneCullCallback on camera";
// install AutoClipPlaneCullCallback : computes near/far planes based on scene geometry
// TODO will the AutoClipPlaneCullCallback be destroyed ?
// TODO does it need to be added to the map node or to the view ?
cullCallback = new osgEarth::Util::AutoClipPlaneCullCallback(mapNode);
// view->getCamera()->addCullCallback(cullCallback);
mapNode->addCullCallback(cullCallback);
// remove light to prevent unnecessary state changes in SceneView
// scene will get light from sky
@ -218,17 +207,9 @@ public:
bool detach(osgViewer::View *view)
{
qDebug() << "OSGViewport::detach" << view;
if (camera) {
camera->detach(view);
}
osgEarth::MapNode *mapNode = osgEarth::MapNode::findMapNode(view->getSceneData());
if (mapNode) {
view->getCamera()->removeCullCallback(cullCallback);
cullCallback = NULL;
}
return true;
}
@ -315,8 +296,6 @@ public:
osg::ref_ptr<osgViewer::CompositeViewer> viewer;
osg::ref_ptr<osgViewer::View> view;
osg::ref_ptr<osg::NodeCallback> cullCallback;
static osg::ref_ptr<osg::GraphicsContext> dummy;
static QtKeyboardMap keyMap;