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Polygon Selection
Most of the options in the texture mapping mode require you to select some polygons first. There are 4 polygon selection modes that can be accessed from the selection mode.
Polygon: While the left mouse button is held down, all polygons that the mouse moves over will be selected.
Object: Whenever a polygon is clicked on, all polygons within the object will be selected.
Rect (In or On): Clicking and holding down the left mouse button will cause a dotted rectangle to be drawn on screen. When the button is release, all polygons that have a vertex within the rectangle will be selected.
Rect(In): Like the previous option, except only polygons that have all of their vertices within the rectangle will be selected.
(In each case, holding down shift will cause polygons to be deselected instead of selected).
There are three other options within the selection menu:
Vertex: This is for selecting individual vertices, and will be explained under Misc > Poly Edit > Create Poly.
Invert: This option allows you to invert the current selection. After choosing this you will be given the option to invert the selection for an individual object, or to invert the selection for the whole level. If you want to do the whole level you should press A, otherwise click on the desired object.
Angle: After choosing this you will be asked for an angle. Any polygon, whose angle away from the horizontal is less than this value, will be selected.
There are also a couple of shortcut keys for polygon selection :
\ + Left Mouse Button Select All Polygons In An Object 0 + Left Mouse Button Select All Polygons In An Object Shift + 0 + Left Mouse Button Deselect All Polygons In An Object Ctrl + \ Select All Polygons In The Level Ctrl + 0 Same As Above L Deselect All Polygons
Finally it is also possible to select all polygons using a given texture , this will be explained under the menu option Misc > Find and select > textured poly.