OK, I will modify the facetize command as I described.
The NULL object could be implemented just like any other object.
The plot, tessellate, and shot routines would be very simple :-)
-John
On 01/08/2011 03:14 PM, Christopher Sean Morrison wrote:
> On Jan 8, 2011, at 1:28 PM, John Anderson wrote:
>
>> While experimenting with the conversion.sh script, I noticed that
>> several reported failures are for regions that have an empty tree, or
>> regions that, when the Boolean operations are evaluated, have nothing
>> left. When these combinations are passed to the facetize command, the
>> db_walk_tree correctly returns a null tree, but the facetize command
>> presumes that a null tree is a failure. I would propose changing the
>> facetize command to produce an empty BOT (or an empty NMG if the "-n"
>> option was provided) in these cases. Perhaps a warning should be
>> displayed that an empty object is being created.
>>
>> Does this sound reasonable?
> That sounds perfect! We were just talking about that issue right
> before the holidays and I'd came to the same conclusion, that we
> needed to support the concept of "null" BoT/NMG objects.
>
> Another thought, albeit a little more involved, was adding a new
> database object representing a generic concept of NULL. So if you
> had a CSG intersection involving two non-overlapping RPPs and you
> evaluated the boolean, you'd end up with a NULL object. There's a
> variety of other places they could be used, including BoT/NMG
> evaluation.
>
> From a theory perspective, the best part is that would complete the
> object entities needed for general set algebra. We'd also need a
> complement/not operator (e.g., a u !b + c)), but the code already
> supports that too. Anyhow, I digress... Sounds great to me! :)
>
> Cheers!
> Sean
>
>
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