Tim Holy <holy@wustl.edu> writes:

On Thursday 21 January 2010 10:45:13 am Jens Krueger wrote:

Currently dat/raw pairs (Qvis) are the only supported way of

getting RGBA into imagevis3d. If you can write your data into nrrd,

you can also easily create QVis files.

[snip]

However, the documentation of the format on this page

http://openqvis.sourceforge.net/docu/fileformat.html seems not to

specify anything about the order of color values in the file.  Should

it be all 4 RGBA values for the first pixel, then all 4 for the

second pixel, etc? Or should it be the red channel for the whole

volume, followed by the green channel for the whole volume, etc?

It should be RGBA, RGBA, RGBA, etc.

Here's a QVis format header that I use to load up an RGBA dataset into
ImageVis3D:

 ObjectFileName: fullbody1728x1008x1878_old.raw
 TaggedFileName: ---
 Resolution:     1728 1008 1878
 SliceThickness: 1 1 3
 Format:         UCHAR4
 NbrTags:        0
 ObjectType:     TEXTURE_VOLUME_OBJECT
 ObjectModel:    RGBA
 GridType:       EQUIDISTANT

You should hopefully be able to just change the filename and use that
file.  Place it in a .dat file so that ImageVis3D will recognize it as
QVis format.

-tom

Am 21.01.2010 um 17:40 schrieb Tim Holy:

Hi again,

In experimenting further with NRRD import, it also appears that the NRRD

importer does not make use of the "space directions" tag. Consequently,

the user has to manually enter the spacing along each coordinate axis.

There are a number of other NRRD0004 features that could also be of

potential interest.

If I'm not barking up the wrong tree in terms of choosing NRRD as a data

interchange format (i.e., with respect to my previous post re RGBA

support), there's a chance I can help with simple bugfixes/extensions

(obviously, in consultation with those who have developed iv3d in the

first place!).

Best,

--Tim