If I set a geometry region with a compound (I call it material C,just mixed with material A and B), material A have optical property and material B not, actually the two material does not react each other. Now I set OPT-PROD and OPT-PROP, the option “Mat” “to Mat” ,should I use the material A or material C?
For example ,just see the picture. LiF and ZnS mixed together and set as geometry region’s material, only ZnS have optical property, then how to set OPT-PROD/PROP’s option “Mat” and “to Mat”?
“ZnS” or “LiFZnS” or set two card “ZnS”，“LiF” respectively?