Learning Forum

[todd]

Having a problem with underlying surface cant seem to delete it and replace it or work around it. causing me headache when i try to eliminate radii and re-trim outside blocks with additional finish. small face error in same area 

[todd]

meant to add the file...

[Brian Bueno]

Todd Roth

To eliminate problem areas like this one, I usually will detach one or more (including all) surfaces in the model until I find the culprit.  Sometimes they're much harder to spot.  In this case, right click the larger "top" face that surrounds the highlighted edges and select Detach.  You can then hide it to get a clear look at the underlying surfaces.  Once those have been deleted however, there are some gaps where the geometry doesn't exactly line up.  There's a bit of overhang on one or more of those areas where the holes are.  The entire gap is outlined in the image below.

After unhiding the original top surface, you can use Repair > Stitch to put it all back together.  If there were no gaps or openings, you'd end up with a watertight solid body.

In this case, neither side of the model is perfectly clean, but the +Y side appears to be in slightly worse shape.

The overhangs on the +Y side are around these areas.  This shot from the -Y side is just to show that the upper and lower portions of faces like these are not parallel.  The telltale sign is the small edge segment dividing what should otherwise be 1 uninterrupted face.  It may not be a requirement, but I thought I'd mention it just in case.