See attached.
On 10/16/07, Robert Osfield <[EMAIL PROTECTED]> wrote:
> Hi Sherman,
>
> This sounds like a precision issue related to the computation of the
> text scaling - which is done in floats.
>
> Could you modify the osgfadetext example to have text they way you are
> setting it up and see if it reproduce the problem, or perhaps send a
> small .osg file that reproduces the issue and then I can have a look
> at it. It might be that we need to have a code path in osgText for
> using double maths internally.
>
> Robert.
>
> On 10/16/07, sherman wilcox <[EMAIL PROTECTED]> wrote:
> > I'm using osgText with the character size mode of
> > OBJECT_COORDS_WITH_MAXIMUM_SCREEN_SIZE_CAPPED_BY_FONT_HEIGHT. The text
> > is position on an ellipsoid model with ECEF coordinates. When the text
> > is smaller than the maximum font height I notice that the text is
> > somewhat wavy when I zoom in and out. Sort of shimmers. Once the text
> > has realized it's maximum size the effect is much less noticable,
> > sometimes completely gone. Could this be a floating point precision
> > issue down in the bowels of osgText? BTW, I'm using an
> > osg::MatrixTransform node to position the text.
> >
> > Any ideas?
> > _______________________________________________
> > osg-users mailing list
> > [email protected]
> > http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
> >
> _______________________________________________
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/* OpenSceneGraph example, osgfadetext.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include <osgViewer/Viewer>
#include <osg/Group>
#include <osg/Geode>
#include <osg/ShapeDrawable>
#include <osg/Texture2D>
#include <osg/PositionAttitudeTransform>
#include <osg/MatrixTransform>
#include <osg/CoordinateSystemNode>
#include <osg/ClusterCullingCallback>
#include <osgDB/FileUtils>
#include <osgDB/ReadFile>
#include <osgText/Text>
#include <osgText/FadeText>
#include <osgSim/OverlayNode>
#include <osgSim/SphereSegment>
#include <osgGA/TerrainManipulator>
#include <osgGA/TrackballManipulator>
#include <iostream>
osg::Node* createEarth()
{
osg::TessellationHints* hints = new osg::TessellationHints;
hints->setDetailRatio(5.0f);
osg::ShapeDrawable* sd = new osg::ShapeDrawable(new
osg::Sphere(osg::Vec3(0.0,0.0,0.0), osg::WGS_84_RADIUS_POLAR), hints);
osg::Geode* geode = new osg::Geode;
geode->addDrawable(sd);
std::string filename =
osgDB::findDataFile("Images/land_shallow_topo_2048.jpg");
geode->getOrCreateStateSet()->setTextureAttributeAndModes(0, new
osg::Texture2D(osgDB::readImageFile(filename)));
osg::CoordinateSystemNode* csn = new osg::CoordinateSystemNode;
csn->setEllipsoidModel(new osg::EllipsoidModel());
csn->addChild(geode);
return csn;
}
osgText::Text* createText(osg::EllipsoidModel* ellipsoid, double latitude,
double longitude, double height, const std::string& str)
{
double X,Y,Z;
ellipsoid->convertLatLongHeightToXYZ( osg::DegreesToRadians(latitude),
osg::DegreesToRadians(longitude), height, X, Y, Z);
osgText::Text* text = new osgText::Text;
osg::Vec3 normal = ellipsoid->computeLocalUpVector( X, Y, Z);
text->setCullCallback(new osg::ClusterCullingCallback(osg::Vec3(X,Y,Z),
normal, 0.0));
text->setText(str);
text->setFont("fonts/arial.ttf");
text->setPosition(osg::Vec3(X,Y,Z));
text->setCharacterSize(115000);
text->setFontResolution(64, 64);
text->setCharacterSizeMode(osgText::Text::OBJECT_COORDS_WITH_MAXIMUM_SCREEN_SIZE_CAPPED_BY_FONT_HEIGHT);
text->setAutoRotateToScreen(true);
osgText::Text::BackdropType type = osgText::Text::OUTLINE;
text->setBackdropType(type);
return text;
}
osg::Node* createFadeText(osg::EllipsoidModel* ellipsoid)
{
osg::Group* group = new osg::Group;
group->getOrCreateStateSet()->setMode(GL_DEPTH_TEST,osg::StateAttribute::OFF);
osg::Geode* geode = new osg::Geode;
group->addChild(geode);
std::vector<std::string> textList;
textList.push_back("Town");
textList.push_back("City");
textList.push_back("Village");
textList.push_back("River");
textList.push_back("Mountain");
textList.push_back("Road");
textList.push_back("Lake");
unsigned int numLat = 1;
unsigned int numLong = 1;
double latitude = 0.0;
double longitude = -100.0;
double deltaLatitude = 1.0f;
double deltaLongitude = 1.0f;
unsigned int t = 0;
for(unsigned int i = 0; i < numLat; ++i, latitude += deltaLatitude)
{
double lgnt = longitude;
for(unsigned int j = 0; j < numLong; ++j, ++t, lgnt += deltaLongitude)
{
geode->addDrawable( createText( ellipsoid, latitude, lgnt, 0, textList[t
% textList.size()]) );
}
}
return group;
}
int main(int, char**)
{
// construct the viewer.
osgViewer::Viewer viewer;
viewer.getCamera()->setComputeNearFarMode(osg::CullSettings::COMPUTE_NEAR_FAR_USING_PRIMITIVES);
viewer.getCamera()->setNearFarRatio(0.00001f);
// read the scene from the list of file specified commandline args.
osg::ref_ptr<osg::Node> root = createEarth();
if (!root) return 0;
// add a viewport to the viewer and attach the scene graph.
viewer.setSceneData(root.get());
osg::CoordinateSystemNode* csn =
dynamic_cast<osg::CoordinateSystemNode*>(root.get());
if (csn)
{
// add fade text around the globe
csn->addChild(createFadeText(csn->getEllipsoidModel()));
}
//viewer.setCameraManipulator(new osgGA::TerrainManipulator);
viewer.setCameraManipulator(new osgGA::TrackballManipulator());
return viewer.run();
}
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