Personnellement, j'ai appris à m'en servir ici:
http://www.dailymotion.com/video/xcl4kf_tutos-e-artsup-introduction-a-rayfi_creation
J'ai pas encore essayé avec les objets transparents (faut que j'installe Vray et la librairie de matériaux).
Je te renvoie sur la doc officielle:
http://www.mirvadim.com/oonlineHelp/1_2_ImpObjProp.html
Ça devrait t'aider car moi j'en ai heu, aucune idée :D
"Important Note: Defined material also define objects solidity for Interactive Demolition simulation. To demolish concrete you will need much more collision force then for glass. Pay attention that it is impossible to demolish objects with defined any of the metal materials. Also there is special rule for Glass and Ice materials. use them in case you want to demolish objects with transparent material, in this case RayFire will fragment object but will keep original geometry, it will animate visibility for Original geometry and for fragments, so abefore collision on your render you will see solid geometry and after collision you will get fragments."