[esp-r] [ESP-r] Problems with edges (from the archive)

[Jon Hand (clcv10)]

Another classic message from the esp-r discussion archive....

A question about defining surface polygons...

:: The new surface is composed by 16 vertices. The error message is  
similar to:
:: "The edge between vertices 14 &15 of Surf-18 may be adjacent to a
::reversed surface"
::and so on 32 times.
::Any help (before I delete the whole zone and start from scratch) is  
welcome

This message is written out when the project manager notices that
edges of a surface have not been defined in the correct order in
relation to adjacent surfaces.  The key word is 'reversed surface'.

ESP-r uses the order of the edges of a surface to determine which face
of the polygon is facing out (the rule is anti-clockwise looking from
the outside).  A wireframe image may look correct, but to be sure
you could use the viewing controls to toggle on surface normals
(arrows should be pointing outwards).

The most likely cause is that you are adding a surface with the order
of the edges reversed so that its orientation is reversed. AND you do
not have to delete a surface in order to correct this, look for the =
'transform'
option at the bottom of the menu and in that you will find an
option to 'invert'.

-ESRU