i modeled a building in skp 2015 make.

but my vray plugin is installed in skp 2013. so i saved the file in a lower version, rendered it in vray.

problem- transparency control is not working.

generally the skp control for transparency gets transferred to vray material. but in this case it isnt. is this a glitch?
also when i try to edit material transparency in vray material editor, no result!

please suggest!!