I have just finished doing this on one of my projects. I made a new window object, based on an existing window object. I think that the general principal below will work on most of the existing window objects, but I haven't tested it on a lot of windows.
You have to be somewhat fearless of GDL to do it.
Here is how I did it:
1) Place a window object that you wish to use into the wall. Of course, it displays in the plan window, which is not desirable. Don't worry about setting any parameters for the window yet.
2) Select the window object that has just been placed, select File>GDL Object>Open Object... from the menu. This will open the objects GDL editing window.
3) Select File>Saveas... from the menu, and save a copy of this object into your Project Library with a different name (i.e. if the original window was Fixed Panel MU 81, save the new object with a name like Fixed Panel MU Above)
4) In the GDL editing window, make the Parameter list active by pressing on the "Parameters" button on the left side. Add two new parameters to the list:
A parameter named "SillHtLimit2D", of type length, with the text "Hide when above:" in the name field.
A parameter named "LimitAdjust", of type length, with the text "Opening size adjustment:" in the name field.
These parameters can be moved to somewhere appropriate in the listing to make finding them easier.
5) Staying in the Parameter listing window, press the "Details..." button at the top of the window. Look for two edit windows that are labeled "X+" and "X-". At the end of the string in those boxes add "-LimitAdjust"
6) Now, in the GDL editing window, make the Parameter Script active by pressing on the "Parameter Script" button on the left side. Add the following text to the very beginning of the script:
IF WIDO_SILL_HEIGHT>SillHtLimit2D THEN
LimitAdjust=A/2
ELSE
LimitAdjust = 0
ENDIF
PARAMETERS LimitAdjust=LimitAdjust
The inserted text is placed at the beginning of the script only because that seems the most likely place to insert it without breaking anything, you can place it somewhere else if your confident about its location.
7) Now, in the GDL editing window, make the 2D Script active by pressing on the "2D Script" button on the left side. Add the following text to the very beginning of the script:
IF WIDO_SILL_HEIGHT > SillHtLimit2D THEN
ADD2 -A/2,WIDO_SILL
LINE2 0,0,0,-WALL_THICKNESS ! These two lines will display in the
LINE2 A,0,A,-WALL_THICKNESS ! wall to indicate a window above.
HOTSPOT2 0,0
HOTSPOT2 A,0
HOTSPOT2 0,-WALL_THICKNESS
HOTSPOT2 A,-WALL_THICKNESS
del 1
ELSE
Then go to the last line*** of the script and add the following text :
ENDIF
***Caution: If the last line of the script is "RETURN" then the script contains subroutines. Look for a line prior to that that reads "END" and place the text above just before that line instead. Press the "Check Script" button at the top of the window to make sure the inserted code doesn't break anything.
8 ) Select File>Save from the menu to save changes. Close the GDL editing window and return to the plan window.
9) Reselect the window placed previously, open its settings dialog, and change it to the new object that has just been saved.
Now set the parameters of the window as desired, and provide a sill height and a value for the "SillHtLimit2D" parameter added above. If the sill height is less than the SillHtLimit2D parameter, a normal window should be displayed, if the value is greater, then the wall should be solid, with two lines representing the width of the window opening above. If the two lines are not desired, edit the 2d script inserted above to your liking.
The 3d version of the object should behave normally.
I hope I have remembered all of the steps. Comments and critiques are encouraged.
