From Tommy's:
http://www.slackiller.com/tommy14/errors.htm#plane

------------------------------
plane with no normal
Example:
Entity 10, Brush 0, Side 4: plane with no normal
Entity 10, Brush 0, Side 5: plane with no normal

This error is always caused by vertex manipulation. A plane is defined by 3
unique coordinates. If any of the three coordinates are the same, then you
don't really have a plane (its either a line or a point). There is no way to
fix this error other than to delete the brush and recreate it completely.

This is most commonly caused by dragging a vertex on top of another to
destroy it for several vertexes of the same face. The resulting brush can
even look correct, but the side which you have destroyed can still have a
point or two defined for it. The proper way to remove a face is to use a
clipper. If the object is simple (say converting a square to a wedge), then
dragging an edge via the yellow control points to merge multiple vertexes at
once will probably be safe.
------------------------------

Do a compare with your previous version of the map and look at the
differerences to find your error.

One thing I always recommend for mappers is to rev the map version each day
and save all the old versions just in case of "oops" like this:
IE:
   map_1a.vmf
gets revd to
   map_1b.vmf

then move map_1a.vmf to old\

the next day or after taking a break for several days.

I also keep all the compile logs since I can search back for when a problem
started to occur in case I missed it.

Make a habit of using visgroups also, they can be a very powerful debugging
tool for problems like this.

qUiCkSiLvEr




----- Original Message -----
From: "A.J. Mcquade"
To: <[email protected]>
Sent: Friday, August 24, 2007 9:26 AM
Subject: [hlds] RE: hlds digest, Vol 1 #5514 - 7 msgs


Plane with no normal error?
the map was fine 4 day s ago i took a short break and its just grr being
retarded and now its not compiling
All i did today was add a computer and a window and extend vents nothing
with vertex's
Thanks, The Management


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