Re: patch coloring help

[Ben Abbott]

On Dec 8, 2013, at 8:54 PM, Rik <address@hidden> wrote:

> On 12/08/2013 12:52 PM, Benjamin Abbott wrote:
>> 
>> On Dec 8, 2013, at 3:39 PM, Pantxo Diribarne <address@hidden> wrote:
>> 
>>> Le 08/12/2013 21:23, Ben Abbott a écrit :
>>>> On Dec 8, 2013, at 1:39 PM, Rik <address@hidden> wrote:
>>>> 
>>>>> 12/8/13
>>>>> 
>>>>> I'm trying to solve patch coloring inconsistencies between Matlab and
>>>>> Octave.  Depending on options to OpenGL I can get the bi-linear
>>>>> interpolation to run on either one of the main diagonals and I want to 
>>>>> know
>>>>> which one Matlab used.  Could someone run the following test script and
>>>>> then send back a png of the output?
>>>>> 
>>>>> v = [0 0 0;1 0 0;1 1 0;0 1 0];
>>>>> f = [1 2 3 4];
>>>>> fvc = [1 0 0;0 1 0;1 0 1;1 1 0];
>>>>> h = patch ('Vertices',v,'Faces',f,'FaceVertexCData',fvc,
>>>>>           'FaceColor','flat','EdgeColor','flat',
>>>>>           'Marker','o','MarkerFaceColor','flat')
>>>>> set (h, 'facecolor', 'interp');
>>>>> print -dpng tst_patch.png
>>>>> 
>>>>> Cheers,
>>>>> Rik
>>>> 
>>>> The png is attached.
>>>> 
>>>> Ben
>>>> 
>>> On linux, ML R2012a, Interpolation is done along the other diagonal. See 
>>> attached png.
>>> 
>>> Pantxo
>>> <tst_patch.png>
>> 
>> Might the difference be due to differences in the OpemGL implementations?
>> 
>> Ben
> 12/8/13
> 
> Maybe it is a difference in face ordering?  Does the coloring change to a 
> different diagonal if you do
> 
> set (h, 'faces', [4 3 2 1])
> 
> I think the documentation says that it shouldn't make a difference, but I'm 
> seeing one in Octave and so maybe there is one in Matlab as well.
> 
> --Rik

Yes.

Ben