In this youtube video : https://www.youtube.com/watch?v=Z-xF5d3esd0&t=204s he explains how you must square off the UV map and essentially entirely fill up the 2048 x 2048 square. Why is this?
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1$\begingroup$ I suppose it's useful in case the image texture is square, also you gain a bit of space, other than that I don't think it's necessary $\endgroup$– moonbootsMay 4, 2022 at 4:15
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$\begingroup$ The reason to "entirely fill up" a UV map as much as possible is for performance considerations - you've already loaded a whole 2048x2048 texture into memory - it would be wasteful (performance wise) to leave big empty (unused) sections. $\endgroup$– Christopher BennettMay 4, 2022 at 5:12
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$\begingroup$ @Duarte Farrajota Ramos, I don't think the question you've linked has to do with Murth's question ;) $\endgroup$– moonbootsMay 4, 2022 at 11:02
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$\begingroup$ Indeed it is a bit different, had not realized that. But it does come back knocking on the same door. If the UV layouts are not square why does the texture have to be square and not make it rectangular to fit the UV map? $\endgroup$– Duarte Farrajota Ramos ♦May 4, 2022 at 11:18
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1 Answer
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It's useful if you want to optimize the space, you'll take better advantage of the space if the islands are orthogonal. Also it may be useful in case the image texture is square. By the way you can use the UV Squares addon to make the islands orthogonal: Select the island, open the N panel > UV Squares, press on To Grid By Shape.
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$\begingroup$ Is it better to keep all the UV maps squared out versus having it being simply unwrapped? $\endgroup$– MurthMay 4, 2022 at 6:28
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$\begingroup$ it is better 1) if you want to optimize the space 2) if you have square textures. Other than that you can keep as they are, there's no obligation to make them straight $\endgroup$ May 4, 2022 at 6:42
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$\begingroup$ Ok thank you I was just wondering if making the UV maps different shapes would affect the textures in a negative way $\endgroup$– MurthMay 4, 2022 at 11:44
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$\begingroup$ "making the UV maps different shapes", could you please precise what you mean? $\endgroup$ May 4, 2022 at 11:46
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$\begingroup$ if you want the texture shape to follow the UV shape (here it's a bent shape), it's ok, here I've just made it straight to show you how you can straighten a UV to make it follow straight lines $\endgroup$ May 4, 2022 at 11:50