||Editing the visual appearance of the volume...
artifacts appear, especially if you assign a sharp boundary in the
tranfer function. Usually such artifacts can be reduced by adjusting
the sampling rate. A higher sampling rate however influences the
rendering performance, so adjusting the sampling rate carefully is
important for both the image quality and the interactivity.
Open the volume
editor and select the Sampling tab.
Move the upper slider
to the left. The number of slice images that is used to display the
volume now decreases. The image quality is low, the rendering speed
Now move the upper
slider to the right. The number of slice images increases and thus
the quality of the image. You may have to adjust the opacity curve
of transfer function to adapt it to the new sampling rate.
you switch on LowRes on Motion in the Volume menu, you
can assign a lower sampling rate for user interaction. If this
feature is enabled, the lower slider determines the sampling rate,
that is used during user interaction. Using different sampling rates
for still images and interactive renderings, we are able to
effectively trade quality for speed.