Why is th UV island normal baking margin calculation by dividing the normal map resolution by 128?

[Ingmar Franz]

Thanks, @jlampel, for the helpfull tips concernning the preparation for a successfull normal map baking! Is the division by 128 for the calculation of the UV island normal baking margin based on the normal map resolution just a value found out by testing or can it be justified mathematically? I know that 128 can be expressed as the result of 2 raised to the power of 7, but maybe there’s an explanation beeing a little bit more detailed. 

[Jonathan Lampel]

I fairly sure it’s just in the range of good values found by testing and that number is specifically convenient because a lot of common texture sizes are multiples of 128. I’d bet it also helps the result of downsampling to be a bit cleaner. More here: http://wiki.polycount.com/wiki/Edge_padding 

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