Hi Robert.
I had missed the MODKEY_SHIFT to activate the manipulator when I tried
it. Works great now. Thanks again.
-Brett
Robert Osfield wrote:
Hi Brett,
On 9 September 2014 09:59, Brett <[email protected] <mailto:[email protected]>>
wrote:
:)...Sorry, it was a lost attempt at less confusion. Yes, I'm
referring to osgVolume where I have created a volume from a number
of 2d images and I want to vary the number of 2d images shown in
the volume or make some of them transparent to give an effect of
slicing the model.
Regarding parametric variables, I meant if the volume was
considered as a 3d texture with a r parameterized texture
coordinate from 0-1 along direction of loading the slices, could I
somehow vary the limits on the parameterized r coordinate to limit
the amount of the model shown for effect of slicing, and if so,
possibly the same for the s and t coordinates to slice from
different directions? Thank you.
osgVolume::VolumeTile has a osgVolume::Locator object that you can use
to place the texture coordinates into model coordinates, and also the
extents of area you want to be visualized. If you want the whole 3d
image data to be displayed then you can share the same Locator between
the VolumeTile and the ImageLayer, but if you want to visualize a
subset then use a separate Locator, with the one of the ImageLayer
placing the image into place in model coordinates, and the Locator on
the VolumeTile settings the extents that you want to render.
If you have a look at the osgvolume example where it wires up
osgManipulator with the VolumeTile::Locator you can see an interactive
example of how you can vary what part of the volume that is rendered.
In the svn/trunk version of the OSG there is also a MultiPassTechnique
that supports use of a convex hull geometry mesh to control the
extents that are rendered.
Robert.
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