chopping the corners off a block

[rols]

This was just a very distilled example, I'd actually been working on something for a while and ended up with a shape I needed to cut the corners off after previous operations, so I made this little test case.

I don't see a button in the post editor to attach URLs. I just dumped two JPGs to a domain I own.

Dissolve was one of the things I tried, this is what I get after I select the four faces of the corner I want to remove and dissolve them, it's a bit of a mess mess, it looks different from either side, from the front you can't see the inside of the back wall any more and there are bare edge lines, from the back there's an impossible face which joins 4 corners which aren't in a plane.

http://dotteddogsoft.com/AfterDissolve1.jpg
http://dotteddogsoft.com/AfterDissolve2.jpg

I couldn't find anything to connect there.

However you did give me an idea about individually dissolving vertices. I've found deleting more than one at a time has unexpected results. If I dissolve one vertex, then another, on the corner edge I get the corner chamfered off. If I then split the remaining face and, with a bit of calculation work out where that new edge needs to move to and use move absolute .. I get what I need.

http://dotteddogsoft.com/Stage1.jpg
http://dotteddogsoft.com/Stage2.jpg
http://dotteddogsoft.com/Stage3.jpg
http://dotteddogsoft.com/Stage4.jpg

That may not be the best way to do it, but at least it worked.