FGFS-4.1/OpenSceneGraph
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Added support for updating the SceneView projection matrix from the values

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of near and far computed during the cull traversal.
This commit is contained in:
Robert Osfield
2003-12-15 23:23:45 +00:00
parent de0253aac7
commit 1158e4605d
5 changed files with 59 additions and 24 deletions
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46
src/osgUtil/CullVisitor.cpp
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@@ -180,27 +180,37 @@ void CullVisitor::popProjectionMatrix()
// so it doesn't cull them out.
osg::Matrix& projection = *_projectionStack.back();
clampProjectionMatrix(projection, _computed_znear, _computed_zfar);
}
CullStack::popProjectionMatrix();
}
bool CullVisitor::clampProjectionMatrix(osg::Matrix& projection, value_type& znear, value_type& zfar) const
{
if (zfar>0.0f)
{
if (projection(0,3)==0.0f && projection(1,3)==0.0f && projection(2,3)==0.0f)
{
//std::cout << "Orthographic projection "<<projection<<std::endl;
value_type span = (_computed_zfar-_computed_znear);
value_type desired_znear = _computed_znear - span*0.02f;
value_type desired_zfar = _computed_zfar + span*0.02f;
value_type span = (zfar-znear);
value_type desired_znear = znear - span*0.02f;
value_type desired_zfar = zfar + span*0.02f;
// near plane clamping.
//double min_near_plane = _computed_zfar*_nearFarRatio;
//if (desired_znear<min_near_plane) desired_znear=min_near_plane;
// assign the clamped values back to the computed values.
_computed_znear = desired_znear;
_computed_zfar = desired_zfar;
znear = desired_znear;
zfar = desired_zfar;
projection(2,2)=-2.0f/(desired_zfar-desired_znear);
projection(3,2)=-(desired_zfar+desired_znear)/(desired_zfar-desired_znear);
//projection(2,2)=-2.0f/(-desired_zfar+desired_znear);
//projection(3,2)=(desired_zfar+desired_znear)/(desired_zfar-desired_znear);
return true;
}
else
@@ -211,22 +221,16 @@ void CullVisitor::popProjectionMatrix()
//std::cout << "_computed_znear"<<_computed_znear<<std::endl;
//std::cout << "_computed_zfar"<<_computed_zfar<<std::endl;
value_type desired_znear = _computed_znear *0.98;
value_type desired_zfar = _computed_zfar *1.02;
// value_type desired_znear = _computed_znear *0.5;
// value_type desired_zfar = _computed_zfar *2.0;
value_type desired_znear = znear *0.98;
value_type desired_zfar = zfar *1.02;
// near plane clamping.
double min_near_plane = _computed_zfar*_nearFarRatio;
double min_near_plane = zfar*_nearFarRatio;
if (desired_znear<min_near_plane) desired_znear=min_near_plane;
//std::cout << " desired_znear"<<desired_znear<<std::endl;
//std::cout << " desired_zfar"<<desired_zfar<<std::endl;
// assign the clamped values back to the computed values.
_computed_znear = desired_znear;
_computed_zfar = desired_zfar;
znear = desired_znear;
zfar = desired_zfar;
value_type trans_near_plane = (-desired_znear*projection(2,2)+projection(3,2))/(-desired_znear*projection(2,3)+projection(3,3));
value_type trans_far_plane = (-desired_zfar*projection(2,2)+projection(3,2))/(-desired_zfar*projection(2,3)+projection(3,3));
@@ -238,14 +242,14 @@ void CullVisitor::popProjectionMatrix()
0.0f,1.0f,0.0f,0.0f,
0.0f,0.0f,ratio,0.0f,
0.0f,0.0f,center*ratio,1.0f));
return true;
}
}
CullStack::popProjectionMatrix();
return false;
}
void CullVisitor::updateCalculatedNearFar(const osg::Matrix& matrix,const osg::BoundingBox& bb)
{
#if 0