One Way Mirror Surface Problem

[Mekanite104]

Hello All-

I am modeling a part in SW2001+ and have an interesting problem. I have a boss extrude thin with some sketch derived cut extrudes through it. While doing some in assembly part editing, a "surface" showed up on my part. Here is the weird part. If I view the top of the part, this surface skin covers my cut extrude holes, and makes the part appear solid. If I rotate the part to the bottom side, I can now see through the cut extrude, and the part has the hole in it! It is acting like a one way mirror. If I view from the top side and select the "real" surface, the entire surface (including the mystery skin over the cut extrude) highlights, but if I select the "fake" surface (click within the cut extrude area) it will not highlight. Yes, I've tried rebuilding, shutting down and re-booting etc. Any ideas what this entity is and how to get rid of it aside from recreating my geometry?

 

[MadMango]

Is your Cut-Extrude a "To Surface" cut? If so, I have seen this happen sometimes when your Image Quality is set to a high Deviation value. If you increase your Quality, then do your Cut-extrude that "fake surface" should go away... at least that has worked for me on several occasions.

You could also just change your cut-extrude to cut a bit deeper (say .005 more) than what is it doing now. "The attempt and not the deed confounds us."

 

[Mekanite104]

Thanks for the tip. The Cut-Extrude is a "through all" and the "fake surface" is on the sketch side of the solid. I changed the Cut-Extrude to a "midplane" with a thickness greater than the part with no effect. I then lowered the Image Quality slider step by step. When the deviation value got to .024 the "fake surface" went away. A deviation value any lower than that (numerically) causes the fake surface to reappear. Unless there are any other tips, I'll just leave the image quality low on this part.