Hello,
I am using osgParticle::PrecipitationEffect to add snow or rain on my scene. I am looking at a way to determine for each particle, if z position is under the terrain or not. The objective is, when a particle is under an object or in a tunnel it should not be visible... In a first time I saw ParticleSystemUpdater <http://www.openscenegraph.org/documentation/OpenSceneGraphReferenceDocs /a01564.html> but I don't know if it can work with PrecipitationEffect... I thought about a shader to do that, but I think I can do that simply with the accept/traverse methods. I suppose I must implement a callback method, called by the visitor, but I don't understand how to implement that visitor with PrecipitationEffect. Can you give me some help? Thanks a lot. Regards, Matthieu.
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