DX supports the concept of "invalid positions" (this is much easier
to implement using the native format, in your case).
So, consider making all non-boundary positions in the data have the
value byte(01) (invalid) and all boundary points valid (byte(00)).
That way, you can preserve the full grid structure as a regular, thus
compact, representation and ignore the invalid positions by
Remove'ing them from the branch in your network that displays the
entire grid.
For a parallel branch that displays only the boundary info, the
invalid positions will cause all interior points to not display.
There are 2 invalid declarations: the byte style I mentioned requires
a value at each grid point. The "by reference" style permits you to
note the indices of only those positions that are to be "invalid",
but in your case that number is probably much larger than the valids,
plus it's probably more work to calculate, so I suggest the simpler
byte mask, that is one invalid position entry (either 00 or 01) for
each position; the invalid positions array is thus to be declared
"position dependent". If you already know the indices of the
boundary, you're almost done.
Chris Pelkie
Vice President/Scientific Visualization Producer
Conceptual Reality Presentations, Inc.
30 West Meadow Drive
Ithaca, NY 14850
[EMAIL PROTECTED]
