Say that I am averaging 5 frames for GI in an animation. If frame #21 is being generated are the GI frames centered around this target frame? In other words, GI frame 21 is being sample as well as the two immediately previous frames (19 & 20) and the two immediately following frames (22 & 23). If frame 1 is being rendered I would presume that only the three GI frames 1,2,3 are being sampled because GI frames 0 and -1 don't exist. Or when the front and end frames are being rendered does the renderer use the first five GI frames 1~5 and the last five GI frames because the ends don't have sufficient surrounding frames to meet the 5 frame averaging criterion? This may sound like nit-picking but I would like to think I understand these details. Thanks.