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Added pixelSize method to CullVisitor, and converted small feature

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culling to use the pixelSize method instead of a ratio of radius to
distance from eye point.  setSmallFeatureCullingPixelSize() method
has also been added to provide the user with finer control of small
featyre culling.
This commit is contained in:
Robert Osfield
2002-05-09 18:59:19 +00:00
parent cf4a3500ec
commit d140decb44
2 changed files with 91 additions and 28 deletions
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78
include/osgUtil/CullVisitor
View File

@@ -197,6 +197,47 @@ class OSGUTIL_EXPORT CullVisitor : public osg::NodeVisitor
return _eyePointStack.back();
}
inline float pixelSize(const osg::Vec3& v, float const radius)
{
const osg::Matrix& mvpw = getMVPW();
if (_windowToModelFactorDirty)
{
_windowToModelFactorDirty=false;
_windowToModelFactor = osg::Vec3(mvpw(0,0),mvpw(1,0),mvpw(2,0)).length();
}
float W = v.x()*mvpw(0,3)+
v.y()*mvpw(1,3)+
v.z()*mvpw(2,3)+
mvpw(3,3);
return fabs(radius*_windowToModelFactor/W);
}
inline bool isCulled(const osg::BoundingSphere& sp,CullingMode& mode)
{
if (!sp.isValid()) return true;
if (!(_modelviewClippingVolumeStack.back().contains(sp,mode))) return true;
if (mode&SMALL_FEATURE_CULLING)
{
if (pixelSize(sp.center(),sp.radius())<_smallFeatureCullingPixelSize) return true;
}
return false;
}
inline const bool isCulled(const osg::BoundingBox& bb,CullingMode mode)
{
if (!bb.isValid()) return true;
return !_modelviewClippingVolumeStack.back().contains(bb,mode);
}
void setSmallFeatureCullingPixelSize(float s) { _smallFeatureCullingPixelSize=s; }
float getSmallFeatureCullingPixelSize() const { return _smallFeatureCullingPixelSize; }
protected:
/** prevent unwanted copy construction.*/
@@ -233,30 +274,6 @@ class OSGUTIL_EXPORT CullVisitor : public osg::NodeVisitor
}
inline bool isCulled(const osg::BoundingSphere& sp,CullingMode& mode) const
{
if (!sp.isValid()) return true;
if (!(_modelviewClippingVolumeStack.back().contains(sp,mode))) return true;
if (mode&SMALL_FEATURE_CULLING)
{
const float _ratio2 = 0.002f*0.002f;
osg::Vec3 delta(sp._center-getEyeLocal());
if (sp.radius2()<delta.length2()*_ratio2)
{
return true;
}
}
return false;
}
inline const bool isCulled(const osg::BoundingBox& bb,CullingMode mode) const
{
if (!bb.isValid()) return true;
return !_modelviewClippingVolumeStack.back().contains(bb,mode);
}
void updateCalculatedNearFar(const osg::Matrix& matrix,const osg::Drawable& drawable);
void updateCalculatedNearFar(const osg::Vec3& pos);
@@ -356,7 +373,9 @@ class OSGUTIL_EXPORT CullVisitor : public osg::NodeVisitor
{
if (!_MVPW_Stack.back())
{
_MVPW_Stack.back() = new osg::Matrix(getModelViewMatrix()*getProjectionMatrix()*getWindowMatrix());
_MVPW_Stack.back() = createOrReuseMatrix(getModelViewMatrix());
(*_MVPW_Stack.back()) *= getProjectionMatrix();
(*_MVPW_Stack.back()) *= getWindowMatrix();
}
return *_MVPW_Stack.back();
}
@@ -381,7 +400,10 @@ class OSGUTIL_EXPORT CullVisitor : public osg::NodeVisitor
MatrixStack _modelviewStack;
MatrixStack _MVPW_Stack;
ClippingVolumeStack _modelviewClippingVolumeStack;
bool _windowToModelFactorDirty;
float _windowToModelFactor;
typedef std::vector<osg::ref_ptr<osg::Viewport> > ViewportStack;
ViewportStack _viewportStack;
@@ -404,7 +426,7 @@ class OSGUTIL_EXPORT CullVisitor : public osg::NodeVisitor
float _LODBias;
float _smallFeatureCullingPixelSize;
enum ComputeNearFarMode
{
@@ -430,7 +452,7 @@ class OSGUTIL_EXPORT CullVisitor : public osg::NodeVisitor
MatrixList _reuseMatrixList;
unsigned int _currentReuseMatrixIndex;
inline osg::Matrix* createOrReuseMatrix(const osg::Matrix value)
inline osg::Matrix* createOrReuseMatrix(const osg::Matrix& value)
{
// skip of any already reused matrix.
while (_currentReuseMatrixIndex<_reuseMatrixList.size() &&

41
src/osgUtil/CullVisitor.cpp
View File

@@ -105,6 +105,10 @@ CullVisitor::CullVisitor()
_numFramesToKeepImpostorSprites = 10;
_impostorSpriteManager = osgNew ImpostorSpriteManager;
_windowToModelFactorDirty = true;
_windowToModelFactor = 1.0f;
_smallFeatureCullingPixelSize = 3.0f;
}
@@ -159,6 +163,8 @@ void CullVisitor::reset()
(*itr)->reset();
}
_windowToModelFactorDirty = true;
_windowToModelFactor = 1.0f;
}
void CullVisitor::pushClippingVolume()
@@ -167,12 +173,16 @@ void CullVisitor::pushClippingVolume()
if (!_modelviewStack.empty()) _modelviewClippingVolumeStack.back().transformProvidingInverse(*_modelviewStack.back());
_MVPW_Stack.push_back(0L);
_windowToModelFactorDirty = true;
}
void CullVisitor::popClippingVolume()
{
_modelviewClippingVolumeStack.pop_back();
_MVPW_Stack.pop_back();
_windowToModelFactorDirty = true;
}
void CullVisitor::pushViewport(osg::Viewport* viewport)
@@ -436,6 +446,37 @@ void CullVisitor::apply(Geode& node)
}
}
// osg::Timer timer;
// osg::Timer_t ta = timer.tick();
// const osg::Matrix& mvpw = getMVPW();
// osg::Timer_t tb = timer.tick();
//
// const osg::BoundingSphere& sp = node.getBound();
// osg::Vec3 v = sp._center;
// float radius = sp._radius;
// osg::Timer_t t1 = timer.tick();
// bool result1 = pixelSize(v,sp.radius())<4.0f;
// osg::Timer_t t2 = timer.tick();
//
// const float _ratio2 = 0.002f*0.002f;
// osg::Vec3 delta(v-getEyeLocal());
// bool result2 = (sp.radius2()<delta.length2()*_ratio2);
//
// osg::Timer_t t3 = timer.tick();
//
// float W = v.x()*mvpw(0,3)+
// v.y()*mvpw(1,3)+
// v.z()*mvpw(2,3)+
// mvpw(3,3);
//
// bool result3 = fabs(radius*_windowToModelFactor/W);
//
// osg::Timer_t t4 = timer.tick();
//
// cout << "time pixelSize = "<<t2-t1<<endl;
// cout << " odl = "<<t3-t2<<endl;
// cout << " stripped = "<<t4-t3<<endl;
// cout << " getMVPW = "<<tb-ta<<endl;
// pop the node's state off the geostate stack.
if (node_state) popStateSet();