[Ves] How to color polydata with Scalars in VES

[Casey Goodlett]

Bo,

Try running vtkShrinkFilter with a scale factor of 1.0 prior to cell data
to point data.  This should create the necessary duplicate vertices.


On Mon, Mar 3, 2014 at 11:01 AM, Bo Yu <yubo1983 at gmail.com> wrote:

> Yes, the colors are blended. Thank you, It sounds reasonable to color
> duplicate points of the triangles, but is that means I have to regenerate
> the polydata? I will try it tomorrow (Tokyo time ;)
>
> Bo Yu
>
> On Tuesday, March 4, 2014, Casey Goodlett <casey.goodlett at kitware.com>
> wrote:
>
>> Is the problem that colors are being blended across the triangles?  If
>> so, you need to duplicate the vertices such that each triangle is defined
>> by three unique vertices (its ok to have multiple vertices with the same
>> XYZ locations).
>>
>> Let me know if that makes sense.
>>
>> Thanks
>>
>>
>> On Mon, Mar 3, 2014 at 10:48 AM, Bo Yu <yubo1983 at gmail.com> wrote:
>>
>>> Thank you for your information, Casey, the color do appear, but it seems
>>> that was colored "vertex by vertex", not as I expected: "cell by cell".
>>> I am using bitbucket with my colleagures. I'll try to create a new repo
>>> in github to let you see.
>>>
>>> Bo Yu
>>>
>>>
>>> On Tuesday, March 4, 2014, Casey Goodlett <casey.goodlett at kitware.com>
>>> wrote:
>>>
>>>>
>>>> On Mon, Mar 3, 2014 at 12:42 AM, Bo Yu <yubo1983 at gmail.com> wrote:
>>>>
>>>>>
>>>>> pd->GetPointData()->SetScalars(colorTable);//color works like on each
>>>>> vertexes and scalar, color table is an vtkUnsignedCharArray which contains
>>>>> same tuples as vertexes number.
>>>>> //pd->GetCellData()->SetScalars(colorTable);//no color at all, color
>>>>> table is an vtkUnsignedCharArray which contains same tuples as cells number.
>>>>>
>>>>>
>>>>
>>>> Bo,
>>>>
>>>> Once you you run the filter you should not overwrite the scalars as
>>>> done on these lines.
>>>>
>>>> If you already built your colorTable for the vertices you dont need to
>>>> use the CellDataToPointData filter at all just set directly as point data.
>>>>
>>>> Is your problem that colors dont appear or they are not as you intended?
>>>>
>>>> Can you share how you have constructed your colorTable?  Is your code
>>>> anywhere public like github that we could look at?
>>>>
>>>> Thanks
>>>>
>>>> --
>>>> Casey B. Goodlett, Ph.D.
>>>> R&D Engineer
>>>> Kitware, Inc. - North Carolina Office
>>>> http://www.kitware.com
>>>> (919) 969-6990 x310
>>>>
>>>
>>
>>
>> --
>> Casey B. Goodlett, Ph.D.
>> R&D Engineer
>> Kitware, Inc. - North Carolina Office
>> http://www.kitware.com
>> (919) 969-6990 x310
>>
>


-- 
Casey B. Goodlett, Ph.D.
R&D Engineer
Kitware, Inc. - North Carolina Office
http://www.kitware.com
(919) 969-6990 x310
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