[Paraview] cannot display 3 component volume data

[Berk Geveci]

Hi Larry,

This sounds like a potential bug. Can you send me a dataset so that I
can reproduce it?

Thanks,
-berk

On Mon, Aug 10, 2009 at 11:59 AM, Lawrence M.
Lifshitz<Lawrence.Lifshitz at umassmed.edu> wrote:
> I have created a 3 component image dataset (.vti format).  I am trying
> to read it into paraview so that I can display it as a red/green/blue image.
> p. 42 of the ParaView Guide says that this should be possible (for 3
> component
> images with unsigned chars for each of the 3 components).
>
> Unfortunately, for some reason I can't even get ParaView to treat this
> as a volume data set.  It reads in the data, but when I try to set it to
> volume rendering  (Object Inspector->Display tab -> Style -> Interpolation
> -> Volume)
> I get the message "cannot volume render since no point (or cell)
> data available".   I am getting this message EVEN THOUGH the
> "Information" tab of the Object Inspector  says
>
> Type: Image (Uniform Rectilinear Grid)
> Number of Cells 10444840
> Number of Points 10747904
> Memory:  3.15e+01 MB
> Data Arrays:
> Name: i2idata
> Data Type:  unsigned char
> Data Ranges:  [0,255], [0,255], [0,255]
>
> This all looks correct to me.
> The extents and bounds are also correct.
>
> So, why, if all this info looks correct, is it saying it doesn't
> have any point data?
>
> I did create the dataset with my own software, so it is possible
> that something in the format is wrong; but it couldn't be very
> wrong if all the display info looks fine.  I also use this software to
> create 1 component signed short data volumes, and those work
> fine (i.e., I can set the display style to "volume").
>
> Alternatively (or maybe better) I would be happy reading in
> 3 images and using different colormaps on each one.  Can ParaView
> handle multiple colormaps with the image volumes superimposed?
> Or even in separate windows (I've tried fooling around with that but
> it seems like it each colormap which gets presented is not independent
> of the others, but not quite identical either; I can't interpret exactly
> what it thinks it is doing)?
>
> Thanks for any help.
>
>  Larry
>
> (I am using ParaView 3.4.0 on Fedora 11 64 bit system).
>
>
> --
> Lawrence M. Lifshitz, Ph. D., Associate Professor
> Biomedical Imaging Group (http://invitro.umassmed.edu)
> University of Massachusetts Medical School (http://www.umassmed.edu)
> Phone: (508) 856-3392   email: Lawrence.Lifshitz at umassmed.edu
> Fax:   (508) 856-1840     web: http://invitro.umassmed.edu/lml
>
>
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