65 lines
1.6 KiB
C++
65 lines
1.6 KiB
C++
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#include "osg/Impostor"
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#include <algorithm>
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using namespace osg;
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Impostor::Impostor()
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{
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_impostorThreshold = -1.0f;
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}
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ImpostorSprite* Impostor::findBestImpostorSprite(const osg::Vec3& currLocalEyePoint)
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{
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float min_distance2 = FLT_MAX;
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ImpostorSprite* impostorSprite = NULL;
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for(ImpostorSpriteList::iterator itr=_impostorSpriteList.begin();
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itr!=_impostorSpriteList.end();
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++itr)
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{
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float distance2 = (currLocalEyePoint-(*itr)->getStoredLocalEyePoint()).length2();
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if (distance2<min_distance2)
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{
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min_distance2 = distance2;
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impostorSprite = itr->get();
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}
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}
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return impostorSprite;
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}
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void Impostor::addImpostorSprite(ImpostorSprite* is)
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{
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if (is && is->getParent()!=this)
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{
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// add it to my impostor list first, so it remains referenced
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// when its reference in the previous_owner is removed.
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_impostorSpriteList.push_back(is);
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if (is->getParent())
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{
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Impostor* previous_owner = is->getParent();
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ImpostorSpriteList& isl = previous_owner->_impostorSpriteList;
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// find and erase reference to is.
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for(ImpostorSpriteList::iterator itr=isl.begin();
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itr!=isl.end();
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++itr)
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{
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if ((*itr)==is)
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{
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isl.erase(itr);
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break;
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}
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}
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}
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is->setParent(this);
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}
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}
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const bool Impostor::computeBound() const
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{
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return LOD::computeBound();
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}
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