Subdivision levels and symmetry
 
 
 

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Action/Results:

Add Subdivision Level Shift + D Shift + D Subdivides the currently active model. An active model is the model under the cursor when the hotkey is pressed.
Step Level Up Page Up Page Up Displays the next densest (higher) subdivision level on the active model. An active mesh is the mesh under the cursor when the hotkey is pressed.
Step Level Down Page Down Page Down Displays the next coarsest (lower) subdivision level on the active model. An active mesh is the mesh under the cursor when the hotkey is pressed.
Set Topological Axis Ctrl + V Command + V Sets the topological axis for symmetry and layer operations. Two adjacent faces of a model's topological center line must be selected when the hotkey is pressed.