FGFS-4.1/OpenSceneGraph
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Added Dragger::applyAppropriateFrontFace(StateSet*) to make it easy to handle inverted matrices by toggling the FrontFace to sure the correct face is visible.

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This commit is contained in:
Robert Osfield
2016-11-11 17:16:40 +00:00
parent 95d450e026
commit 8af48d369c
4 changed files with 31 additions and 3 deletions
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22
src/osgManipulator/Dragger.cpp
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@@ -15,6 +15,7 @@
#include <osgManipulator/Dragger>
#include <osgManipulator/Command>
#include <osg/Material>
#include <osg/FrontFace>
#include <osgGA/EventVisitor>
#include <osgViewer/View>
#include <osg/io_utils>
@@ -198,6 +199,27 @@ Dragger::~Dragger()
{
}
bool Dragger::inverted() const
{
osg::Vec3d xAxis(_matrix(0,0), _matrix(1,0), _matrix(2,0));
osg::Vec3d yAxis(_matrix(0,1), _matrix(1,1), _matrix(2,1));
osg::Vec3d zAxis(_matrix(0,2), _matrix(1,2), _matrix(2,2));
double volume = (xAxis^yAxis)*zAxis;
return volume<0.0;
}
void Dragger::applyAppropriateFrontFace(osg::StateSet* ss) const
{
osg::StateAttribute* sa = ss->getAttribute(osg::StateAttribute::FRONTFACE);
osg::FrontFace* ff = dynamic_cast<osg::FrontFace*>(sa);
if (!ff)
{
ff = new osg::FrontFace;
ss->setAttribute(ff);
}
ff->setMode( inverted() ? osg::FrontFace::CLOCKWISE : osg::FrontFace::COUNTER_CLOCKWISE);
}
void Dragger::setHandleEvents(bool flag)
{
if (_handleEvents == flag) return;

2
src/osgVolume/Locator.cpp
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@@ -229,7 +229,7 @@ bool Locator::inverted() const
osg::Vec3d xAxis(_transform(0,0), _transform(1,0), _transform(2,0));
osg::Vec3d yAxis(_transform(0,1), _transform(1,1), _transform(2,1));
osg::Vec3d zAxis(_transform(0,2), _transform(1,2), _transform(2,2));
float volume = (xAxis^yAxis)*zAxis;
double volume = (xAxis^yAxis)*zAxis;
return volume<0.0;
}