I have wondered about that, right now I'm doing a render and it says 640% EFF, what's that mean? I did use light portal... **thinks** I think, can't remember if I used it then or another scene but I know I learned about it at that time. I sorta got that concept, it says it won't take up resources from outside the scene, yet it still renders what you can see outside. Does that mean it won't collect data on what's not viewable? Does it only have to be for windows or can you make a "U" around the sides/back of the camera as well as a top one where it's not visible? Don't really quite get the concept.CL88 wrote:do you know about effectiveness? it show up in bottom of lux render window in percentage, maybe for your scene this value is too small? did you use light portal?
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