The rendering of my not so fancy scene (100K object, a dozen meshes, one 
light, one infinite object, no photon, no radiosity, few and small glass 
objects,...), I get Bounding box tests = 80% of Light Buffer tests AND a 
very low success ratio of 0.07% !!!!

Are these values typical ?
Is it legitimate to say that  automatic bounding is not very efficient in 
this case ? 80% of all the tests necessary for the redering are made on the 
hierarchy of bounding boxes with a miserable success ratio !
My few tries with manual bounding the CSG (few differences and many unions) 
are not very encouraging. Should I insist ?

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