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Question by CunningGrayFox · Feb 21, 2017 at 09:39 PM · 2dspritenormalmapnormal mapnormal maps

What are these lines called on normal map?

I imported a greyscale of my platform sprite into Unity and changed its texture type to a normal map from greyscale. As you can see the normal map came out all strange with a bunch of lines stretching from the sprite to the edges. I've been looking up and down for an answer to what these lines are called and how to fix them but my Google-fu just isn't strong enough. Can anyone tell me what these lines are called?

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normal-map.png (104.5 kB)
cleaned-day-platform-06.png (48.5 kB)
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avatar image RobAnthem · Feb 21, 2017 at 10:38 PM 1
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Because alpha is a conceptual idea of opacity based on the 4th color channel, converting an image to a normal map using unitys standard system is not always your best option. Essentially what you are seeing is an interpretation of the various color channels that by default, are still in your image. The best solution is to create the normal map in an image-editing program yourself, with an alpha layer, and make Unity format it as a normal texture with alpha from greyscale.

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