Re: Release candidate for Qhull 2012.1

[Brad Barber]

At 08:50 PM 1/29/2012, Ben Abbott wrote:

>On Jan 29, 2012, at 8:46 PM, Dmitri A. Sergatskov wrote:
>
>> On Sun, Jan 29, 2012 at 7:38 PM, Ben Abbott <address@hidden> wrote:
>> 
>>> On Matlab ...
>>> 
>>> cube = [0 0 0;1 0 0;1 1 0;0 1 0;0 0 1;1 0 1;1 1 1;0 1 1];
>>> [h, v] = convhulln (cube);
>>> 
>>> h =
>>> 
>>>     3     4     2
>>>     2     4     1
>>>     6     2     1
>>>     5     6     1
>>>     4     8     1
>>>     8     5     1
>>>     7     3     2
>>>     6     7     2
>>>     7     4     3
>>>     7     8     4
>>>     7     6     5
>>>     8     7     5
>>> 
>>> 
>>> v =
>>> 
>>>     1
>>> 
>>> [h, v] = convhulln (cube, {'Qt'})
>>> 
>>> h =
>>> 
>>>     3     4     2
>>>     2     4     1
>>>     6     2     1
>>>     5     6     1
>>>     4     8     1
>>>     8     5     1
>>>     7     3     2
>>>     6     7     2
>>>     7     4     3
>>>     7     8     4
>>>     7     6     5
>>>     8     7     5
>>> 
>>> v =
>>> 
>>>     1
>>> 
>>> I get the same with Octave (tip below) on MacOSX 10.7.2 (Lion).
>>> 
>>> $ hg tip
>>> changeset:   14282:b4d7de953066
>>> tag:         tip
>>> user:        Michael Goffioul <address@hidden>
>>> date:        Sun Jan 29 12:53:05 2012 +0000
>>> summary:     Export more required symbols [Win32].
>>> 
>>> Does Fedora really return a 6x4 matrix for the first test?
>>> 
>>> Ben
>> 
>> octave:1> cube = [0 0 0;1 0 0;1 1 0;0 1 0;0 0 1;1 0 1;1 1 1;0 1 1];
>> octave:2> [h, v] = convhulln (cube);
>> octave:3> h
>> h =
>> 
>>   4   1   2   3
>>   5   6   2   1
>>   8   5   1   4
>>   6   7   3   2
>>   7   8   4   3
>>   8   7   6   5
>> 
>> Fedora 16 x86_64, octave 3.6.0, qhull 2003.1
>> 
>> Dmitri.
>
>Using qhull version < 2011 I got the same thing.
>
>Doesn't this result imply that the 6 faces of the cube are being returned and 
>not the 12 triangulated faces ?
>
>Given the default option is "Qt" shouldn't the result be triangles?
>
>Ben

Note the version from Fedora.  It is using qhull 2003.1 which introduced option 
'Qt'.  

My guess is that the Fedora build did not set 'Qt' as the default option list.  

All targets for Octave should use the same default option list.

                                        --Brad