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Added support for pixel range to PagedLOD

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This commit is contained in:
Robert Osfield
2004-11-20 11:48:28 +00:00
parent 8d44f7b15e
commit 796b4cbe8d
1 changed files with 39 additions and 4 deletions
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43
src/osg/PagedLOD.cpp
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@@ -1,4 +1,18 @@
/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2003 Robert Osfield
*
* This library is open source and may be redistributed and/or modified under
* the terms of the OpenSceneGraph Public License (OSGPL) version 0.0 or
* (at your option) any later version. The full license is in LICENSE file
* included with this distribution, and on the openscenegraph.org website.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* OpenSceneGraph Public License for more details.
*/
#include <osg/PagedLOD>
#include <osg/CullStack>
using namespace osg;
@@ -99,13 +113,34 @@ void PagedLOD::traverse(NodeVisitor& nv)
break;
case(NodeVisitor::TRAVERSE_ACTIVE_CHILDREN):
{
float distance = nv.getDistanceToEyePoint(getCenter(),true);
float required_range = 0;
if (_rangeMode==DISTANCE_FROM_EYE_POINT)
{
required_range = nv.getDistanceToEyePoint(getCenter(),true);
}
else
{
osg::CullStack* cullStack = dynamic_cast<osg::CullStack*>(&nv);
if (cullStack)
{
required_range = cullStack->pixelSize(getBound());
}
else
{
// fallback to selecting the highest res tile by
// finding out the max range
for(unsigned int i=0;i<_rangeList.size();++i)
{
required_range = osg::minimum(required_range,_rangeList[i].first);
}
}
}
int lastChildTraversed = -1;
bool needToLoadChild = false;
for(unsigned int i=0;i<_rangeList.size();++i)
{
if (_rangeList[i].first<=distance && distance<_rangeList[i].second)
if (_rangeList[i].first<=required_range && required_range<_rangeList[i].second)
{
if (i<_children.size())
{
@@ -136,7 +171,7 @@ void PagedLOD::traverse(NodeVisitor& nv)
if (nv.getDatabaseRequestHandler() && numChildren<_perRangeDataList.size())
{
// compute priority from where abouts in the required range the distance falls.
float priority = (_rangeList[numChildren].second-distance)/(_rangeList[numChildren].second-_rangeList[numChildren].first);
float priority = (_rangeList[numChildren].second-required_range)/(_rangeList[numChildren].second-_rangeList[numChildren].first);
// modify the priority according to the child's priority offset and scale.
priority = _perRangeDataList[numChildren]._priorityOffset + priority * _perRangeDataList[numChildren]._priorityScale;