I've used Mental Ray for years, switched to Iray + and used it for a licence term of one year. During the time I have worked with VRAY on some projects and Corona renderer, too. I find no renderer comparable to IRay in terms of quality, but I couldn't find a way to convert my old scene files to Iray materials. That is a major drawback for me as,

1. I use several ready made models and my old projects with different renderers.
2. Sometimes scenes get complex and GPU can't cope with it. I need to get back to another renderer.

A working tool for material conversion seems a MUST.

Is there an efficient converter that converts other renderer features to Iray?