[vtkusers] How to get two different 1D-arrays used as hue and the other as value in lut?

[David Gobbi]

On Mon, Dec 21, 2009 at 3:58 PM,  <lynx.abraxas at freenet.de> wrote:
> On 21/12/09 15:46:54, David Gobbi wrote:
>> On Mon, Dec 21, 2009 at 3:22 PM,  <lynx.abraxas at freenet.de> wrote:
>> >
>> > OK. So now the more advanced stuff:
>> > I have two different 1D-arrays (single scalar-arrays).
>>  >  One   of  them  I  want  to  choose the hue of the lut and the other one
> should
>> > choose the value of a HSV-lookuptable.  Is  that  related  to  the  before
> mentioned
>>  >  "color   by   any  array  not just scalars"? Is that possible already or
> would I
>> > have to do that in blender?
>> >
>> > Thanks for any help, hints or examples;-)
>> > Lynx
>>
>> I'm not 100% sure what you mean.  Do you just want to use one array
>> for H, another array for V, and keep S constant?
>
> Yes, that would be what I want (S:= 1).
> But to make it even more complicated: The  array  for  H  would  be  for  face
> colours  (from  cell  normals)  and the array for V for point colors (smoother
> error).
>
>> No you can't, unfortunately, because you have to choose just 1 array
>>
>> So it should be possible, but not easy.  It would actually be easier
>> to write your own "for" loop that will take your H array and V array
>> and create your own RGB color array.
>
> Well, that would be what I'd prefer but how do  I  make  the  mapper  take  my
> colours instead of using a lut? In all the members of vtkMapper there are some
> members  with  color  in  their  name  but  none  that  looks   to   me   like
> UseCellColor().  If  it  would be to use mapper.SetScalarModeToUseCellData() I
> don't know how to replace the already existant cell data.
>
> Any ideas on how to realize this?
> Thanks for any help or hints.
> Lynx

At this point, I think that I'll just have to tell you to continue
studying the vtkMapper docs and do some experimentation.  Good luck.

   David