@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.