Expressions that extract geometry unique to walls. These must be prefixed with wall, e.g. wall.thickness
thickness 
The total wall thickness 

surfaceOutside 
The wall net exterior surface area 

surfaceInside 
The wall net interior surface area 

surfaceEdge 
The total wall edges surface area 

surfaceOutsideGross 
The wall gross exterior surface area 

surfaceInsideGross 
The wall gross interior surface area 

lengthOutside 
The length along the wall exterior 

lengthInside 
The length along the wall interior 

lengthCentre 
The length along the wall centreline 

doorCount 
The number of doors in the wall 

doorSurface 
The total surface area of doors in the wall 

doorWidth 
The total width of doors in the wall 

windowCount 
The number of windows in the wall 

windowSurface 
The total surface area of windows in the wall 

windowWidth 
The total width of windows in the wall 

sweep 
The sweep angle a curved wall turns through – zero for straight walls 

radius 
The radius of a curved wall – zero for straight walls 

slantInside 
The interior slant angle of the wall (0 for vertical) 

slantOutside 
The exterior slant angle of the wall (0 for vertical) 

slantAngle 
Either the interior or exterior slant angle of the wall (whichever is nonvertical, in that order). Zero if both sides are vertical 
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