Vinkel v1.0 - Jed Plugin
Written by Andr Di Geronimo a.k.a dr0id
dr0id@home.se | http://hem2.passagen.se/thesj/dr0idstuff/
Copyright (C) 1998, Andr Di Geronimo.
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About
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Vinkel will run trough all surfaces in
your level and if it finds a surface with a
slope below a user definied angle it will 
floor flag it.

Install
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Copy vinkel.exe and vinkel.exe.dsc to JedDir\plugins.

Use
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When you run Vinkel from jed you will be prompted for 3
options: Angle, Process All/Selected and Remove Floor Flag,
here is a description of them:

Angle: (Default: 45)
If a surface has a slope below this angle, make sure it has
a floor flag or set it.

Process All/Selected (Default: All)
Should Vinkel run trough all surfaces or only the selected
ones, usefull for big levels.

Remove Floor Flag: (Default: No)
If a surface doent have a slope below the angle but does
have the floor flag set, should Vinkel remove it?

If you want to use the default settings you can simple hit 
return on all options without writing anything.

Source
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The source code for this plugin is avilable on my homepage (URL above).

Thanks to
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Craig Urquhart for help with floor isFloor() function.
Alexei Novikov for his vector article (#1), Jed and Jeds Ole Interface.

Enjoy!