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I applied subsurf modifier, saved the file and then quit the blender but when I reopned it I realized that I need to go back but it doesn't undo it and my undo history is empty. Can anyone help me?

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marked as duplicate by Duane Dibbley, p2or, Ray Mairlot, Scott Milner, Duarte Farrajota Ramos Jan 17 at 3:08

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  • $\begingroup$ As far as I know, the undo history isn't saved in the file, but kept only in memory, thus it gets lost if you close and reopen Blender. You could try the decimate modifier set to un-subdivide. It's not guaranteed to produce the exact reverse of the subdivide modifier you already applied, but it might be worth a try. $\endgroup$ – Duane Dibbley Dec 18 '18 at 3:08
  • $\begingroup$ I tried it but it totally changes my model $\endgroup$ – Alamdar Hussain Dec 18 '18 at 3:15
  • $\begingroup$ What actually happened is, I wasn't able to apply my modifier with my shapekeys on so I decided to redo my shapekeys and I deleted them and applied the subsurf but It made my model very complexed and I can't undo it..... Its very frustated. $\endgroup$ – Alamdar Hussain Dec 18 '18 at 3:18
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There are several options.

Check in the folder where you have your .blend if there are several files with the same name, but with the extensions .blend1, .blend2 and so on. When you save a .blend, the previous version of the file gets renamed to .blend1, and if there already exists a .blend1, it gets renamed to .blend2. This is a setting in Blender, but if I remember correctly, it's enabled by default. CtrlAltU to open up user preferences, then click File and check the rightmost column to find out whether you have it enabled.

There may also be previous versions of the file lingering in your temporary folder. These could have either the same name as your original file, or they could be named by the process ID of the Blender instance that last had it opened. The temporary folder is usually /tmp on Linux and other Unix like systems. On Windows I'm not 100% certain, but C:\Temp or C:\Windows\Temp may be good places to start searching. On MacOS I have no idea.

You may also try the Decimate modifier, set to Un-Subdivide. On a complex mesh, it probably will not exactly reverse the subsurf, but it might be worth a try.

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