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Grant Abbitt - Choosing the Margin value .
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The value is a percentage.
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Using 0.008 or 0.01 is fine.
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Royal Skies - Improve space in the textures, by symmetry .
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Do not create UVs for faces inside the geometry.
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Do not create UVs for geometry that repeats and should share the same texture.
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He does not explain how to recover deleted geometry, or how to make deleted geometry have the same UV as the other.
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UV Map