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Added support for fine grained computation of the near plane, by taking

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into account individual primitives culled against the view frustum.

Added better support for computing the near far for billboards.
This commit is contained in:
Robert Osfield
2004-04-29 22:21:06 +00:00
parent 522ffca03c
commit 5d79eb1c9d
3 changed files with 472 additions and 36 deletions
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48
include/osgUtil/CullVisitor
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@@ -198,8 +198,12 @@ class OSGUTIL_EXPORT CullVisitor : public osg::NodeVisitor, public osg::CullStac
inline value_type getCalculatedFarPlane() const { return _computed_zfar; }
void updateCalculatedNearFar(const osg::Matrix& matrix,const osg::Drawable& drawable) { updateCalculatedNearFar(matrix,drawable.getBound()); }
void updateCalculatedNearFar(const osg::Matrix& matrix,const osg::BoundingBox& bb);
value_type computeNearestPointInFrustum(const osg::Matrix& matrix, const osg::Polytope::PlaneList& planes,const osg::Drawable& drawable);
bool updateCalculatedNearFar(const osg::Matrix& matrix,const osg::BoundingBox& bb);
bool updateCalculatedNearFar(const osg::Matrix& matrix,const osg::Drawable& drawable, bool isBillboard=false);
void updateCalculatedNearFar(const osg::Vec3& pos);
/** Add a drawable to current render graph.*/
@@ -341,6 +345,46 @@ class OSGUTIL_EXPORT CullVisitor : public osg::NodeVisitor, public osg::CullStac
osg::ref_ptr<osg::ImpostorSpriteManager> _impostorSpriteManager;
osg::ref_ptr<osg::State> _state;
struct MatrixPlanesDrawables
{
MatrixPlanesDrawables(const osg::Matrix& matrix, const osg::Drawable* drawable, const osg::Polytope& frustum):
_matrix(matrix),
_drawable(drawable)
{
// create a new list of planes from the active walls of the frustum.
osg::Polytope::ClippingMask result_mask = frustum.getResultMask();
osg::Polytope::ClippingMask selector_mask = 0x1;
for(osg::Polytope::PlaneList::const_iterator itr=frustum.getPlaneList().begin();
itr!=frustum.getPlaneList().end();
++itr)
{
if (result_mask&selector_mask) _planes.push_back(*itr);
selector_mask <<= 1;
}
}
MatrixPlanesDrawables(const MatrixPlanesDrawables& mpd):
_matrix(mpd._matrix),
_drawable(mpd._drawable),
_planes(mpd._planes) {}
MatrixPlanesDrawables& operator = (const MatrixPlanesDrawables& mpd)
{
_matrix = mpd._matrix;
_drawable = mpd._drawable;
_planes = mpd._planes;
return *this;
}
osg::Matrix _matrix;
const osg::Drawable* _drawable;
osg::Polytope::PlaneList _planes;
};
typedef std::multimap<value_type, MatrixPlanesDrawables> DistanceMatrixDrawableMap;
DistanceMatrixDrawableMap _nearPlaneCandidateMap;
};