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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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);
}