If you try to rotate 3D graphic to set viewpoint somewhere on Z axis (look at the 3D graphics from
above), you will find out that it is not possible. That view is implemented as a separate option
called Spectrogram view.
You can switch to a Spectrogram view by choosing 3D Tools/Spectrogram view from menu, or
All operations including ruler handling, zooming, colors changing,... are the same as with
standard 3D-graphics. In addition, you can use a mouse rectangle selection to zoom-in fast to
part of the spectrogram. Also, by using your mouse wheel, you can perform a fast zoom-in our
zoom-out on a spectrogram view.
Spectrogram view is very useful and fast when used with 3D graphics created with “Track
changes as 3D graphics” option, because a big part of the graphic can simply be scrolled, and
only a new data is drawn each time data in origin window (for example, FFT) changes.
Time axis is always shown from left to right (X-axis). The direction of the frequency axis (Y-axis)
can be changed by using main menu option "3D Tools/Spectrogram frequency direction".
If you move your mouse cursor over spectrogram view, current X/Y values under the cursor will
be shown as a tooltip.
Spectrogram view makes it easy to draw spectrograms in SIGVIEW.