need help troubleshooting a fairly standard 3ds max glitch

[stayinwonderland]

The scene I'm working on now has a couple of issues:

 

1. I'm getting like a grid snap effect in the perspective viewport when snap isn't enabled.

2. Objects that are pretty close (but NOT overlapping) look like they're co-planar.

 

I think there is something wrong with system units (possibly) and that the model is too large or way too small. No matter how hard I try I can never fully understand system units so I could have messed things up. The scene is in millimetres with 1 unit = 1 millimetre. I changed this to 1 unit = 1 inch but nothing really changes.

 

I just tried scaling the geometry up a lot, down a lot and it doesn't make a difference.

 

I changed the viewport driver around too.

 

Can confirm that in all viewports (including orthographic) everything is sweet as a nut (no snapping, no overlapping and flickering geometry). Just perspective views are bust.

 

Also tried resetting scene and merging in.

 

Not leaving much for you to troubleshoot but my only guess is graphics drivers? I have had iffy graphics issues which seem to get weirder with every new scene I make.

 

Thanks in advance

[Scott Schroeder]

Where is your object in world space? If you are millions of units away from 0,0,0 you can get really strange things happening.

 

The co-planer I think is just a Max display thing. As long as they are not co-planer in the render, that is all I'd worry about.

 

If you draw a box at 5x5x5 with your system units set to mm, then change them to inches, you won't see the box scale itself. The change happens under the hood. Especially if your box is collapsed to an edit poly or mesh. If you apply a UVW map modifier and you don't get the numbers you expect, you need to reset the object's X-Form to get it back into the current system units.

[stayinwonderland]

You win the prize! The scene didn't begin by building geometry but by importing a DWG file, which orientated itself many units away from the origin.

 

Thanks a bunch!