ST_BARCorner
Information about window corners
TYPE ST_BARCorner :
STRUCT
lrX : LREAL;
lrY : LREAL;
bShaded : BOOL;
END_STRUCT
END_TYPE
lrX: X-coordinate of the window (on the facade).
lrY: Y-coordinate of the window (on the facade).
bShaded: information as to whether this corner is in the shade: bShaded=TRUE: corner is in the shade.