@khashayar said:

@thomthom said:

Make sure you don't have faces overlapping each other. Kind of looks like z-fighting.
Also, make sure your mesh normals are correct, that it's the front-side of the face that's pointing outwards.

thanks thom. i know it may sound silly but i don't know where can i check the normals?

Set the Style to display Default Material, and set the back-side color to a brightly coloured one so you can easily see the difference between front and back.
By default it's white for front and blue/gray for back.

@khashayar said:

@thomthom said:

http://www.smustard.com/script/CloseOpens

And I'm also working on a variant of my own that will be in the next Edge Tools.

thank you for your reply thomthom. 😄

I should have the next version of Edge Tools ready within next week. ( I hope )

yesss. you're right. all of them are there.
thank you very much