Hi,
I assume you are talking LDT, not C3D.
What you are seeing is a 'new feature' that was added a few versions ago.
LDT now 'remembers' what triangle edges were created from a breakline
definition, and the terrain edit / 'add Line' will not dishonor that in-put
data definition.
However, as Russell has pointed out, the terrain edit / 'flip face' has no
such integrity, and is more than willing to re-triangulate like you want.
Talk about inconsistent behavior. Add-line is nothing more than an easy way
to flip multiple faces, yet it operates by different rules than the 'flip
face'.
I understand the evolution of thought as to why it was added - but the way
it was implemented was not well thought out. The user should not expect
that 'add line' behaves like non-destructive break lines in some cases, and
flip faces in other cases. There is no visual indication when importing
lines to edit - which are controlled by breaklines constraints and which are
not.
The matter only gets worse when working with landXML surface data. In this
case, ALL edges are treated as breaklines and 'add line' does nothing more
than imitate non-destructive breaklines in its behavior.
sc
"kedovac" wrote in message
news:12116104.1088807530485.JavaMail.jive@jiveforum2.autodesk.com...
> i've been working few years with sufraces but few days ago working on one
project when i wanted to flip face by adding a new line that new line didn't
force crossing lines to flip but create surface points in intersections
instead. any idea what to do to have it like before when adding a new line
would force lines below new line to flip.
> thanx.