If you ever find the need to temporarily straighten 3D objects in 3ds Max try using the IgNite Springboard plugin.
Select the object or objects you want to work on and click the Straighten button.
When you're done, click on the straighten button to reset to the original position.
Please note. It's best to attach objects before straightening as it doesn't work with groups.
For more IgNite information;
https://docs.sinisoftware.com/ignite-...
https://www.sinisoftware.com
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