Survex 1.1.5 - A couple of LRUD features

[Mike McCombe]

Olly,
Being able to OMIT dimensions in LRUD data looks like a powerful feature, so
I thought I'd try it. What happened wasn't what I'd expected...

Omitting one dimension seems to result in not just that specific dimension
being omitted, but all of the remaining dimensions on that line. For example
(taking the values in the normal order) specifying values for left, up and
down but omitting right with "-" has the effect that up and down are also
omitted. When I take a look at the .3d file it contains values of 0xffff for
right, up and down, not just for the "right" value.

An interesting behaviour in Aven happens when I have a centreline which is a
straight line N/S or E/W. Aven opens in "elevation" mode, shows no
"Elevation" or "facing" controls and ignores the "P" and "L" commands.
However, the mouse-wheel still tilts the survey. Perhaps this has something
to do with the centreline plan being "one-dimensional" on the screen. It
still does it when my "one-dimensional" passage has finite width from the
LRUD passage data.

All the best,
Mike