I’ve been having this problem my whole life. I’ve been using Sketchup for 10 years or something. It’s infuriating and I’ve never figured it out. I usually just abandon a model once it starts happening, or revert to an old version and rebuild everything from scratch.
Most of the SketchUp stuff I do gets outputted for CNC cutting. CNC software is super super picky with vectors. I can’t afford to invest time in a model that could potentially be glitchy in the final output. I use that “~” as a glitch-o-meter, basically.
I’m finally trying to solve this because I have a model I have invested hundred of hours in and the ~ just started showing up. All my plywood thickness was set to .72". Now everything I draw show up at .720018, .720020, .719910 etc. I’m checking old plywood sections that I modeled before the glitch began and they are still a proper .720000 .
I’ve found that in SketchUp, once the glitches began they compound and compound till the model is total trash and every small action takes 3 times longer and you seriously compromise the possibility of a clean use-able output. Remodeling everything from scratch is easier than plowing through the bs.
Anyway…I’ve noticed these glitches also occur in angles (ie 89.9999 degrees). In my current model I’m making sure that all new planes are perfectly locked to the axis before drawing. Then I ‘pull’ .720000 then I measure and it say .720013 …then I measure the same object again and .720011.
I do think the snapping is central to the problem…like some kind of interference between slightly off-axis planes…slightly unparallel lines. But because of snapping…the origin-fuck-up (ofu) infects all subsequent planes.
But like I said…with CNC output…you need to flatten all the parts and export an accurate vector…without redundant points…totally closed vertices…planes that are perfectly parallel to the ‘parallel projection’ camera etc. It’s a huge issue. Not trivial. Has plagued my models for about ten years now. I’m about to remodel two incredibly complex curved surface pneumatic vertical opening doors. That’s about 15 hours of work I just burned because of this glitch. Already reverted to autosaves and can’t detect the OFU. I can’t seem to salvage any part of the doors without some how inheriting the glitch. Infuriating. That’s life. That’s SketchUp. It’s a high stakes game of glory and ruin. Nothing in between. Can I get a heck-yeah from all the SketchUp fans out there?