@toto85980 said:
which I place into my spotlight component and behind the glass ; and I got the render I'm looking for, but the Kerkythea render take more time. I'll shared my skp component if you have any idea to perform my render ... I don't know how to set a fake emit light material on my object.
[attachment=2:3tb4kf8q]<!-- ia2 -->spotlightsample.jpg<!-- ia2 -->[/attachment:3tb4kf8q]
If you put a light behind the glass, glass will turn light to caustic light, that will render quite lot slower. Please read trough Kerkythea tutorials at http://www.kerkythea.net/forum/viewtopic.php?f=16&t=5720 They will guide you trough the basics.