[vtkusers] creating colortables (and opacity) with 3 scalars, rather than 1

[Alex Malyushytskyy]

Scalar may have can components, but I always displayed  1 component at a
time.

At the same time if you work with vector you should be able to display
magnitude without computing it yourself.
It might be enough just to call SetVectorModeToMagnitude for your look up
table (defined in vtkScalarsToColors:).

I have not tried this and quick search did not show any example.
So hope somebody else can help you with it.

Regards,
    Alex



On Thu, Jul 25, 2013 at 4:49 AM, Ruff <albin.nilsson at gmail.com> wrote:

> Thank you, but unfortunately It looks like the other examples i found. Tied
> to every point is one and only one value and regardless of colormap or
> lookuptable they only map one value to one color.
>
> Say that i tie value 1 to a color, then i still have the ability of
> [1,0,0],
> [0,1,0] and [0,0,1] if my structuredPoints have 3 separate values to them
> (and even more possibilities if the mapping is done with absolute values)
> Instead of
> AddRGBPoint(value,R,G,B) or SetTableValue(value, R,G,B,alpha)
> i would like to have some way of specifying
> AddRGBPoint(val1,val2,val3,R,G,B) or SetTableValue(val1,val2,val3,
> R,G,B,alpha)
>
> This makes sense to me since vtkStructuredPoints have the method
> SetNumberOfScalarComponents()
> (Mathematically speaking it is "just" a question of interpolating piecewise
> functions in 3-space instead of 1-space)
>
>
>
> --
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> Sent from the VTK - Users mailing list archive at Nabble.com.
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