[vtkusers] how to access computation of scalarstocolors mapping

[Deepak Roy]

Hi kiran,

to my knowledge, vtkLookUpTable does not put any limit over the colors to be
added.

you can add as many entries to the table as you want.

vtkLookUpTable::SetNumberOfTableValues(  );

For each table entry, you can assign any of the 24 million ( 256 red x 256
green x 256 blue rgb combinations ) colors.

In essence you can use all the 24 million colors to the lookup table, and
refer to them using a linear color index - which would be your polydata
scalars.

Please read the documentation of vtkLookUpTable clearly ---

http://www.vtk.org/doc/nightly/html/classvtkLookupTable.html#45e8946b4f0c250ec9ab8236bcc20a12

Regards,

Deepak Roy

On 2/8/06, kshivann at engineering.uiowa.edu <kshivann at engineering.uiowa.edu>
wrote:

> hi,
> i guess vtklookuptable lets 256 colors to be defined. is there a limit to
> number of colors to be defined. how do i do it if i have more than 256
> scalar
> values.
>
> kiran
>
> Quoting Deepak Roy <cdeepakroy at gmail.com>:
>
> > Hi kiran,
> >
> > Did you try using vtkLookUpTable, it lets you define a color for each
> scalar
> > value.
> >
> > Is that what you wanted.
> >
> > Let me know.
> >
> > Regards,
> >
> > Deepak
> >
> > On 2/8/06, kshivann at engineering.uiowa.edu <
> kshivann at engineering.uiowa.edu>
> > wrote:
> >>
> >> hi all,
> >>     i would like to color each cell/point in a polydata according to my
> >> set of
> >> requirements. right now vtkscalarstocolors function calculates the
> colors
> >> of
> >> the cell/point automatically given the saturation range and scalar
> range.
> >> is
> >> there a way to input rgb values for the cell/point individually.
> >>
> >> thanks
> >>
> >> kiran
> >>
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>
>
>
>
>
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