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Kukri knife tutorial: does non-square unwrap cause distortion/degradation?

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Dr. Jones
Posts: 1
Joined: Mon May 28, 2018 7:35 am

Mon May 28, 2018 8:20 am

Hello everybody.
I have a couple of questions regarding the 2:1 unwrap technique showed in the kukri knife tutorial that I hope someone can answer.
I understand that the knife is a rectangular shaped mesh, and unwrapping it inside a single 0-1 UV space is a waste of resolution, and that Substance Painter doesn't support non-square texture, hence the idea of squashing horizontally the uv mapping and baking the mesh maps with that configuration.

My doubts are:

1. Having a squashed map can it cause distortion on baking the normal maps?
2. all of this squash (for baking) -> un-squash (for export) -> squash (when applied by a render engine) could lead to image degradation (like when you apply transformations on an image in photoshop)?

Sorry in advance if my questions are silly, I'm just trying to understand :P
and btw sorry for my English, I'm not a native speaker
Thank you for your time.
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Nikolay Sych
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Location: Russia/Moscow
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Fri Jun 08, 2018 11:02 am

Actually I dont really know, but i think it does not, because it kinda stretches our baked maps in 2:1 and then renders all our texture layers on it, so in general you have twice more detail in one texture dimension
Result is the best motivation.
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