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One Way Mirror Surface Problem

One Way Mirror Surface Problem

One Way Mirror Surface Problem

(OP)
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?

RE: One Way Mirror Surface Problem

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."

RE: One Way Mirror Surface Problem

(OP)
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.

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