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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
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@@ -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() &&