FGFS-4.1/OpenSceneGraph
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Added computation of occluders volume scaled relative to the frustum volume,

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all volumes computed in eye coords.
This commit is contained in:
Robert Osfield
2002-06-15 12:14:42 +00:00
parent 25b420ac0e
commit 52c36dde70
10 changed files with 110 additions and 54 deletions
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22
src/osg/CollectOccludersVisitor.cpp
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@@ -11,7 +11,13 @@ CollectOccludersVisitor::CollectOccludersVisitor()
{
// overide the default node visitor mode.
setTraversalMode(NodeVisitor::TRAVERSE_ACTIVE_CHILDREN);
/*setCullingMode(VIEW_FRUSTUM_CULLING|
NEAR_PLANE_CULLING|
FAR_PLANE_CULLING|
SMALL_FEATURE_CULLING);*/
_minimumShadowOccluderVolume = 0.01;
_createDrawables = false;
}
@@ -122,11 +128,17 @@ void CollectOccludersVisitor::apply(osg::OccluderNode& node)
ShadowVolumeOccluder svo;
if (svo.computeOccluder(_nodePath, *node.getOccluder(), *this,_createDrawables))
{
// need to test occluder against view frustum.
// std::cout << " adding in Occluder"<<std::endl;
_occluderList.push_back(svo);
if (svo.getVolume()>_minimumShadowOccluderVolume)
{
// need to test occluder against view frustum.
std::cout << " adding in Occluder"<<std::endl;
_occluderList.push_back(svo);
}
else
{
std::cout << " rejecting Occluder as its volume is too small "<<svo.getVolume()<<std::endl;
}
}
}

35
src/osg/CullStack.cpp
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@@ -8,6 +8,7 @@ CullStack::CullStack()
_cullingMode = ENABLE_ALL_CULLING;
_LODBias = 1.0f;
_smallFeatureCullingPixelSize = 3.0f;
_frustumVolume=-1.0f;
}
@@ -71,16 +72,16 @@ void CullStack::pushCullingSet()
float P23 = P(2,3);
float P33 = P(3,3);
osg::Vec4 pixelSizeVector2(M(0,2)*P23,
osg::Vec4 pixelSizeVector(M(0,2)*P23,
M(1,2)*P23,
M(2,2)*P23,
M(3,2)*P23 + M(3,3)*P33);
pixelSizeVector2 /= scale.length();
pixelSizeVector /= scale.length();
//cout << "pixelSizeVector = "<<pixelSizeVector<<" pixelSizeVector2="<<pixelSizeVector2<<endl;
_modelviewCullingStack.push_back(osgNew osg::CullingSet(*_projectionCullingStack.back(),*_modelviewStack.back(),pixelSizeVector2));
_modelviewCullingStack.push_back(osgNew osg::CullingSet(*_projectionCullingStack.back(),*_modelviewStack.back(),pixelSizeVector));
}
}
@@ -109,8 +110,9 @@ void CullStack::pushProjectionMatrix(Matrix* matrix)
_projectionStack.push_back(matrix);
osg::CullingSet* cullingSet = osgNew osg::CullingSet();
// set up view frustum.
cullingSet->getFrustum().setToUnitFrustumWithoutNearFar();
cullingSet->getFrustum().setToUnitFrustum(_cullingMode&NEAR_PLANE_CULLING,_cullingMode&FAR_PLANE_CULLING);
cullingSet->getFrustum().transformProvidingInverse(*matrix);
// set the small feature culling.
@@ -132,6 +134,8 @@ void CullStack::pushProjectionMatrix(Matrix* matrix)
_projectionCullingStack.push_back(cullingSet);
// need to recompute frustum volume.
_frustumVolume = -1.0f;
pushCullingSet();
}
@@ -143,6 +147,9 @@ void CullStack::popProjectionMatrix()
_projectionCullingStack.pop_back();
// need to recompute frustum volume.
_frustumVolume = -1.0f;
popCullingSet();
}
@@ -201,3 +208,23 @@ void CullStack::popModelViewMatrix()
_bbCornerNear = (~_bbCornerFar)&7;
}
void CullStack::computeFrustumVolume()
{
osg::Matrix invP;
invP.invert(getProjectionMatrix());
osg::Vec3 f1(-1,-1,-1); f1 = f1*invP;
osg::Vec3 f2(-1, 1,-1); f2 = f2*invP;
osg::Vec3 f3( 1, 1,-1); f3 = f3*invP;
osg::Vec3 f4( 1,-1,-1); f4 = f4*invP;
osg::Vec3 b1(-1,-1,1); b1 = b1*invP;
osg::Vec3 b2(-1, 1,1); b2 = b2*invP;
osg::Vec3 b3( 1, 1,1); b3 = b3*invP;
osg::Vec3 b4( 1,-1,1); b4 = b4*invP;
_frustumVolume = computeVolume(f1,f2,f3,b1,b2,b3)+
computeVolume(f2,f3,f4,b1,b3,b4);
}

1
src/osg/CullingSet.cpp
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@@ -30,3 +30,4 @@ void CullingSet::disableOccluder(NodePath& nodePath)
}
}
}

33
src/osg/ShadowVolumeOccluder.cpp
View File

@@ -139,20 +139,20 @@ Plane computeFrontPlane(const PointList& front)
}
// compute the volume of tetrahedron
inline float computeVolume(const osg::Vec3& a,const osg::Vec3& b,const osg::Vec3& c,const osg::Vec3& d)
{
return fabs(((b-c)^(a-b))*(d-b));
}
// compute the volume of prism.
inline float computeVolume(const osg::Vec3& f1,const osg::Vec3& f2,const osg::Vec3& f3,
const osg::Vec3& b1,const osg::Vec3& b2,const osg::Vec3& b3)
{
return computeVolume(f1,f2,f3,b1)+
computeVolume(b1,b2,b3,f2)+
computeVolume(b1,b3,f2,f3);
}
// // compute the volume of tetrahedron
// inline float computeVolume(const osg::Vec3& a,const osg::Vec3& b,const osg::Vec3& c,const osg::Vec3& d)
// {
// return fabs(((b-c)^(a-b))*(d-b));
// }
//
// // compute the volume of prism.
// inline float computeVolume(const osg::Vec3& f1,const osg::Vec3& f2,const osg::Vec3& f3,
// const osg::Vec3& b1,const osg::Vec3& b2,const osg::Vec3& b3)
// {
// return computeVolume(f1,f2,f3,b1)+
// computeVolume(b1,b2,b3,f2)+
// computeVolume(b1,b3,f2,f3);
// }
// compute the volume between the front and back polygons of the occluder/hole.
float computeVolume(const PointList& front, const PointList& back)
@@ -265,8 +265,7 @@ bool ShadowVolumeOccluder::computeOccluder(const NodePath& nodePath,const Convex
Matrix invP;
invP.invert(P);
float volumeview = computeVolumeOfView(invP);
cout << "volumeview "<<volumeview<<endl;
float volumeview = cullStack.getFrustumVolume();
// compute the transformation matrix which takes form local coords into clip space.
@@ -390,7 +389,7 @@ bool ShadowVolumeOccluder::computeOccluder(const NodePath& nodePath,const Convex
}
std::cout << "final volume = "<<_volume<<std::endl;
//std::cout << "final volume = "<<_volume<<std::endl;
return true;
}