CGAL users discussion list

["Bill Conan" <>]

hello Andreas,

thank you very much. I think that is an option, but is that efficient?

I'm wondering how people do this kind of operation normally?

for example, when applying a subdivision on a geometry object,

should i make a cloned object and do all the modification on it and
return the cloned one, or i just need to modify the original one.

i know the first way is easier to implement and also safer, but it
eats up more memory.

i think those commercial software, say 3D max, always keeps the
original geometry and do modification on a cloned object.

thank you,

On Mon, Jun 16, 2008 at 3:13 PM, Andreas Fabri
<>
 wrote:
>
> Hello Bill,
>
> what you might do is to copy the edges you want to split
> into a container and then just split them.
>
> The behaviour of an iteration over the edges as they are stored in the
> datastructure itself interlaced with operations modifying the datastructure
> depends too much on how they are stored.
>
> andreas
>
>
> Bill Conan wrote:
>>
>> hello Pierre,
>>
>> thank you very much for your reply. but i don't want to make things
>> complicated. i just need to split each edge into two.
>>
>> so here is my understanding: if i split an edge e into e1 and e2,
>>
>> then e1 will be at the same location in the edge list as the edge e is,
>>
>> and e2 will be added to the end of the list.
>>
>> so if i write the code as this
>>
>> enditer=edge.end();
>> for(edgeiter=edge.begin();edgeiter<enditer;++edgeiter)
>> {
>>   split edgeiter;
>>
>>   // will edgeiter become null here?
>> }
>>
>> i'll be fine (the code will not loop forever). am i right?
>>
>> thank you very much.
>
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-- 
Dept. of Computer Science
University of California, Davis
Homepage:http://wwwcsif.cs.ucdavis.edu/~yans/