Undo scene operation

`Ctrl` + `Z`

All hotkeys for Autodesk 3ds Max 2017 (Windows)

General user interface New scene	`Ctrl` + `N`
General user interface Shade selected faces	`F2`
General user interface Wireframe/smooth and highlight	`F3`
General user interface View edged faces	`F4`
General user interface Selection lock	`Space`
General user interface Select	`Q`
General user interface Add to selection	`Ctrl` + `Left mouse click`
General user interface Remove from selection	`Alt` + `Left mouse click`
General user interface Move	`W`
General user interface Rotate	`E`
General user interface Scale	`R`
General user interface Hide grids	`G`
General user interface Snaps	`S`
General user interface Angle snap	`A`
General user interface Percent snap	`Ctrl` + `Shift` + `P`
General user interface Create camera from view	`Ctrl` + `C`
General user interface Restrict movement along specific axis	`F5`
General user interface Restrict plane cycle	`F8`
General user interface Render last	`F9`
General user interface Render scene dialogue	`F10`
General user interface Render to texture dialogue	`0`
General user interface Quick render	`Shift` + `Q`
General user interface Material editor	`M`
General user interface Particle view	`6`
General user interface Environment and effects dialogue	`8`
General user interface Open advanced lighting panel	`9`
General user interface Open MAXScript listener	`F11`
General user interface Open last used explorer	`Alt` + `Ctrl` + `Q`
General user interface Isolate selection	`Alt` + `Q`
General user interface Maximise viewport	`Alt` + `W`
General user interface Place highlight	`Ctrl` + `H`
General user interface Select by name/select from scene	`H`
General user interface Select none	`Ctrl` + `D`
General user interface Select invert	`Ctrl` + `I`
General user interface Select ancestor	`Page up`
General user interface Selct child	`Page down`
General user interface Clone	`Ctrl` + `V`
General user interface Adaptive degradation	`O`
General user interface Expert mode(single Viewport)	`Ctrl` + `X`
General user interface Undo scene operation	`Ctrl` + `Z`
General user interface Redo scene operation	`Ctrl` + `Y`
General user interface Undo viewport operation	`Shift` + `Z`
General user interface Redo viewport operation	`Shift` + `Y`
General user interface Show safeframes	`Shift` + `F`
General user interface Show statistics	`7`
General user interface Auto key mode	`N`
General user interface Hide/ show cameras	`Shift` + `C`
General user interface Hide/ show geometry	`Shift` + `G`
General user interface Hide/ show helpers	`Shift` + `H`
General user interface Hide/ show lights	`Shift` + `L`
General user interface Hide/ show particle system	`Shift` + `P`
General user interface Hide/ show shapes	`Shift` + `S`
General user interface Hide/ show space warps	`Shift` + `W`
General user interface Display as see-through	`Alt` + `X`
Views Top	`T`
Views Bottom	`B`
Views Left	`L`
Views Front	`F`
Views Isometric user	`U`
Views Perspective user	`P`
Views Camera	`C`
Views Spot/directional light	`Shift+ 4`
Editable Poly Vertex level	`1`
Editable Poly Edge level	`2`
Editable Poly Border level	`3`
Editable Poly Poly level	`4`
Editable Poly Element level	`5`
Editable Poly Extrude mode	`Shift` + `E`
Editable Poly Bevel mode	`Ctrl` + `Shift` + `B`
Editable Poly Chamfer mode	`Ctrl` + `Shift` + `C`
Editable Poly Connect	`Ctrl` + `Shift` + `E`
Editable Poly Edge constaint	`Shift` + `X`
Editable Poly Target weld	`Ctrl` + `Shift` + `W`
Editable Poly Cut	`Alt` + `C`
Editable Poly Quickslice	`Ctrl` + `Shift` + `Q`
Editable Poly Hide	`Alt` + `H`
Editable Poly Hide unselected	`Alt` + `I`
Editable Poly Unhide all	`Alt` + `U`
Quad menu Animation	`Alt` + `Right mouse click`
Quad menu Lighting/Render	`Ctrl` + `Alt` + `Right mouse click`
Quad menu Modelling	`Ctrl` + `Right mouse click`
Quad menu Reactor	`Alt` + `Shift` + `Right mouse click`
Quad menu Snap	`Shift` + `Right mouse click`
Quad menu Viewports	`V`
Material editor Background	`B`
Material editor Backlight	`L`
Material editor Cycle 3x2, 5x3, 6x4 sample slots	`X`
Material editor Get material	`G`
Material editor Go backward to sibling	`Left arrow`
Material editor Go forward to sibling	`Right Arrow`
Material editor Go to parent	`Up arrow`
Material editor Make preview	`P`
Material editor Options	`O`
Key and Time controls Slection lock switch	`Spacebar`
Key and Time controls Auto key mode	`N`
Key and Time controls Set key mode	`'`
Key and Time controls Set keys	`K`
Key and Time controls Play/stop animation	`/`
Key and Time controls Backup Time One Unit	`, (comma)`
Key and Time controls Forward Time One Unit	`. (period)`
Key and Time controls Go to start frame	`Home`
Key and Time controls Go to end frame	`End`
Viewport Navigation Controls Zoom mode	`Alt` + `Z`
Viewport Navigation Controls Zoom extents	`Alt` + `Ctrl` + `Z`
Viewport Navigation Controls Zoom extents all	`Shift` + `Ctrl` + `Z`
Viewport Navigation Controls Zoom selected all	`Z`
Viewport Navigation Controls Zoom in 2X	`Alt` + `Shift` + `Ctrl` + `Z`
Viewport Navigation Controls Zoom out 2X	`Alt` + `Shift` + `Z`
Viewport Navigation Controls Zoom region mode	`Ctrl` + `W`
Viewport Navigation Controls Zoom viewport in	`[` / `Scroll wheel forward`
Viewport Navigation Controls Zoom viewport out	`]` / `Scroll wheel backward`
Viewport Navigation Controls Pan view	`Ctrl` + `P` / `Middle mouse button`
Viewport Navigation Controls Interactive pan	`I`
Viewport Navigation Controls Arc rotate	`Ctrl` + `R`
Viewport Navigation Controls Min/max switch	`Alt` + `W`
Walk through mode Forward	`W`
Walk through mode Back	`S`
Walk through mode Left	`A`
Walk through mode Right	`D`
Walk through mode Up	`E` / `Shift` + `UP arrow`
Walk through mode Down	`C` / `Shift` + `Down arrow`
Walk through mode Accelerate	`Q`
Walk through mode Decelerate	`Z`
Walk through mode Increase step size	`]`
Walk through mode Decrease step size	`[`
Walk through mode Reset step size	`Alt` + `[`
Walk through mode Level	`Shift` + `Spacebar`
Walk through mode Lock vertical rotation	`Spacebar`
Virtual viewport Virtual viewport toggle	`/`
Virtual viewport Virtual viewport zoom in	`+`
Virtual viewport Virtual viewport zoom out	`-`
Virtual viewport Virtual Viewport pan down	`2`
Virtual viewport Virtual viewport pan left	`4`
Virtual viewport Virtual viewport pan right	`6`
Virtual viewport Virtual viewport pan up	`8`
Subobjects Subobject mode toggle	`Ctrl` + `B`
Subobjects Subobject level cycle	`Insert`
Subobjects Subobject level 1	`1`
Subobjects Subobject level 2	`2`
Subobjects Subobject level 3	`3`
Subobjects Subobject level 4	`4`
Subobjects Subobject level 5	`5`
Subobjects Delete subobject	`Delete`
Subobjects Local select subobject by name	`Ctrl` + `H`
Hierarchies Select ancestor	`Page up`
Hierarchies Select child	`Page down`
Hierarchies Select children	`Ctrl` + `Page down`
Hierarchies Select entire hierarchy	`Double click parent`