FGFS-4.1/OpenSceneGraph
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Added support for using the error metric to guide the simplficiation process

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This commit is contained in:
Robert Osfield
2004-04-19 23:08:30 +00:00
parent 45179b8868
commit 061244056d
4 changed files with 87 additions and 78 deletions
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47
include/osgUtil/Simplifier
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@@ -28,11 +28,47 @@ class OSGUTIL_EXPORT Simplifier : public osg::NodeVisitor
{
public:
Simplifier(float sampleRatio=0.5f);
Simplifier(float sampleRatio=1.0f, float maximumError=0.0f);
void setSampleRatio(float sampleRatio) { _sampleRatio = sampleRatio; }
float getSampleRatio() const { return _sampleRatio; }
void setMaximumError(float error) { _maximumError = error; }
float getMaximumError() const { return _maximumError; }
class ContinueSimplificationCallback : public osg::Referenced
{
public:
/** return true if mesh should be continued to be simplified, return false to stop simplification.*/
virtual bool continueSimplification(const Simplifier& simplifier, float nextError, unsigned int numOriginalPrimitives, unsigned int numRemainingPrimitives) const
{
return simplifier.continueSimplificationImplementation(nextError, numOriginalPrimitives, numRemainingPrimitives);
}
protected:
virtual ~ContinueSimplificationCallback() {}
};
void setContinueSimplificationCallback(ContinueSimplificationCallback* cb) { _continueSimplificationCallback = cb; }
ContinueSimplificationCallback* getContinueSimplificationCallback() { return _continueSimplificationCallback.get(); }
const ContinueSimplificationCallback* getContinueSimplificationCallback() const { return _continueSimplificationCallback.get(); }
bool continueSimplification(float nextError, unsigned int numOriginalPrimitives, unsigned int numRemainingPrimitives) const
{
if (_continueSimplificationCallback.valid()) return _continueSimplificationCallback->continueSimplification(*this, nextError, numOriginalPrimitives, numRemainingPrimitives);
else return continueSimplificationImplementation(nextError, numOriginalPrimitives, numRemainingPrimitives);
}
virtual bool continueSimplificationImplementation(float nextError, unsigned int numOriginalPrimitives, unsigned int numRemainingPrimitives) const
{
if (nextError<=getMaximumError()) return true;
return (float)numRemainingPrimitives > (float)numOriginalPrimitives * getSampleRatio();
}
virtual void apply(osg::Geode& geode)
{
for(unsigned int i=0;i<geode.getNumDrawables();++i)
@@ -40,20 +76,21 @@ class OSGUTIL_EXPORT Simplifier : public osg::NodeVisitor
osg::Geometry* geometry = geode.getDrawable(i)->asGeometry();
if (geometry)
{
simplify(*geometry,_sampleRatio);
simplify(*geometry);
}
}
}
/** simply the geometry to defined ratio of original size.*/
void simplify(osg::Geometry& geometry, float sampleRatio);
void simplify(osg::Geometry& geometry, unsigned int targetNumberOfTriangles);
void simplify(osg::Geometry& geometry);
protected:
float _sampleRatio;
float _maximumError;
osg::ref_ptr<ContinueSimplificationCallback> _continueSimplificationCallback;
};