단축키/조작법들
left click : area select
wheel click : rotate view
wheel+ctrl : pan view
wheel+shift : zoom in/out
right click : choose view(top/left/right/bottom)
Ctrl + num : front(1), rear(2), left(3), right(4), top(5), bottom(6), normal to(8)
F : Fit model to screen
V : filter vertices
E : filter edges
X : filter faces
C : expand/collapse tree
C + shift : collapse all items
tap(on the object) : hide the hovered-over objects
tap + shift(on the object) : show the hovered-over objects
tap + ctrl + shift : show all the hidden objects
F9 : show/hide FeatureManager Tree Area
