Hi, I'm currently trying to create a design a 1 millimeter thick disc with a gentle curve, into which I am creating an indentation. To create this indentation, I project (or trim) a pattern, extrude it, and perform a Boolean operation. This process sometimes fails, so I'm currently testing with a simplified model.

I've noticed that even when it appears to be correctly processed on MoI, as shown in the attached image, the surface can actually be inverted. Is there a way to check in MoI whether a surface is inverted or not?
I have learned that I can use the 'Flip' command to reverse a face. However, I need a way to identify which faces are reversed.



Furthermore, is it possible to convert a 'Joined srf' like this one into a Solid? If it is possible, I expect that the surface will revert to the correct direction when it is converted to Solid.

I also tried Edit > Join command. But, I get following result.


P.S. In Blender, I confirm the orientation of the faces by selecting the "face orientation" option from the Overlays dropdown.

Thank you. I believe I've resolved the issue. Although I haven't tested it on my main project yet, I'm confident it will work.

By using trim instead of projection, I managed to create an indented design.
I realized my mistake was performing a boolean operation on the "Joined srf" which was obtained by the trim operation. By keeping a copy of the solid and performing the boolean operation on that, I was able to get a solid.

Since I was able to get a 'Solid', I shouldn't have any issues with the orientation of the faces anymore. I will confirm this in my upcoming checks.

Hi marzRX, yes if you form your object as a closed solid then it will automatically orient the normals towards the outside of the solid.

Usually it is easiest to cut a solid using boolean difference with another solid as the cutting object instead of Trim. Trim is more of a low level operation, booleans are kind of like a batch mode where they combine trimming and automatically discards pieces based on what volume they are contained inside of and then automatically joined as well.

- Michael

Thank you, Michael. I was able to create it.
I wondered if I could represent a design from a certain Photoshop tutorial on YouTube in 3D, so I decided to give it a try.
https://www.youtube.com/watch?v=LMIb0K96uYE



MoI is a savior for me. The results that can be obtained through study are excellent, making the whole process very enjoyable. ;)