[Question]What is Mean Crease???

Hi, I am asking about Mean Crease, i created many projects & renders before but, i never used this mean crease, i know it’s something to make the edges sharper but can any one explain??? :slight_smile:

http://wiki.blender.org/index.php/Doc:2.6/Manual/Modifiers/Generate/Subsurf#Weighted_Creases

thank you, this helpful