Why does it create a speckle effect when rendering best?
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The “Best Render” is a legacy renderer that is needed for some materials to render correctly. In general you will find that the Best Preview Render or “BPR” gives the best results (see Render>BPR Render Pass>BPR). If you are using a material which needs the Best Render you can do the Best Render first and then a BPR immediately after.