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Transform world-space particle systems in update callback so that animations are accounted for

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This commit is contained in:
scrawl 2017-02-21 18:59:38 +01:00
parent 0fbd29ccb8
commit 3693f05ef5
1 changed files with 41 additions and 27 deletions
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64
components/resource/scenemanager.cpp
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@ -31,37 +31,18 @@
namespace
{
/// @todo Do this in updateCallback so that animations are accounted for.
class InitWorldSpaceParticlesVisitor : public osg::NodeVisitor
class InitWorldSpaceParticlesCallback : public osg::NodeCallback
{
public:
/// @param mask The node mask to set on ParticleSystem nodes.
InitWorldSpaceParticlesVisitor(unsigned int mask)
: osg::NodeVisitor(TRAVERSE_ALL_CHILDREN)
, mMask(mask)
virtual void operator()(osg::Node* node, osg::NodeVisitor* nv)
{
}
osgParticle::ParticleSystem* partsys = static_cast<osgParticle::ParticleSystem*>(node);
bool isWorldSpaceParticleSystem(osgParticle::ParticleSystem* partsys)
{
// HACK: ParticleSystem has no getReferenceFrame()
return (partsys->getUserDataContainer()
&& partsys->getUserDataContainer()->getNumDescriptions() > 0
&& partsys->getUserDataContainer()->getDescriptions()[0] == "worldspace");
}
void apply(osg::Drawable& drw)
{
if (osgParticle::ParticleSystem* partsys = dynamic_cast<osgParticle::ParticleSystem*>(&drw))
{
if (isWorldSpaceParticleSystem(partsys))
{
// HACK: Ignore the InverseWorldMatrix transform the particle system is attached to
if (partsys->getNumParents() && partsys->getParent(0)->getNumParents())
transformInitialParticles(partsys, partsys->getParent(0)->getParent(0));
}
partsys->setNodeMask(mMask);
}
node->removeUpdateCallback(this);
}
void transformInitialParticles(osgParticle::ParticleSystem* partsys, osg::Node* node)
@ -83,6 +64,39 @@ namespace
box.expandBy(sphere);
partsys->setInitialBound(box);
}
};
class InitParticlesVisitor : public osg::NodeVisitor
{
public:
/// @param mask The node mask to set on ParticleSystem nodes.
InitParticlesVisitor(unsigned int mask)
: osg::NodeVisitor(TRAVERSE_ALL_CHILDREN)
, mMask(mask)
{
}
bool isWorldSpaceParticleSystem(osgParticle::ParticleSystem* partsys)
{
// HACK: ParticleSystem has no getReferenceFrame()
return (partsys->getUserDataContainer()
&& partsys->getUserDataContainer()->getNumDescriptions() > 0
&& partsys->getUserDataContainer()->getDescriptions()[0] == "worldspace");
}
void apply(osg::Drawable& drw)
{
if (osgParticle::ParticleSystem* partsys = dynamic_cast<osgParticle::ParticleSystem*>(&drw))
{
if (isWorldSpaceParticleSystem(partsys))
{
partsys->addUpdateCallback(new InitWorldSpaceParticlesCallback);
}
partsys->setNodeMask(mMask);
}
}
private:
unsigned int mMask;
};
@ -489,7 +503,7 @@ namespace Resource
// we can skip any scene graphs without update callbacks since we know that particle emitters will have an update callback set
if (node->getNumChildrenRequiringUpdateTraversal() > 0)
{
InitWorldSpaceParticlesVisitor visitor (mParticleSystemMask);
InitParticlesVisitor visitor (mParticleSystemMask);
node->accept(visitor);
}
}