Waterfall and spectrogram data can be shown in a 3D view allowing rotation
to examine the data from different angles. The view can be rotated by pressing
the left mouse button and dragging or by using the arrow keys. The horizontal
and vertical viewing angles are shown while adjusting. To reposition the plot
use right click and drag or shift plus arrow keys. The mouse wheel or the plus and
minus keys zoom in or out. Note that you may need to click on the plot to give
it focus before keys will work.
Right clicking on the plot brings up a menu of settings.
The setting panel has sliders which can also be used to adjust the viewing angle, or new values can be typed into the adjacent text fields. The angle of of the light source can be changed using the light angle controls.
The X, Y and Z axis ratios allow the proportions of the plot to be adjusted. Setting the Z axis ratio to zero flattens the plot, producing a 2D spectrogram. Set the horizontal angle to zero and the vertical angle to 90 degrees to view that spectrogram from above.
Focal length controls the perspective effect. The effect can be turned off by unchecking the Perspective box.
The plot includes reflections of the light source from the surface, those can be removed by unchecking the Show highlights box. The data can be flipped along either axis using the Flip Frequency axis and Flip Time axis boxes. Contours can be added by ticking the Show contours box, with Contour interval controlled by the slider or its text field. Banded colours changes from a smooth variation to bands of colour. Show colour bar controls whether the colour bar appears alongside the plot. The colour scheme is that selected for the corresponding 2D waterfall or spectrogram plots. The sides of the plot can be filled by selecting Close edge faces.
Fit to panel adjusts the scale to accommodate the plot and its axes. Restore defaults will reset the controls.
The SPL, Predicted SPL and Distortion overlays allow groups of measurements to be
viewed in a 3D plot. That makes sense where the measurements form a meaningful surface,
such as a set of polar loudspeaker frequency response measurements or a set of measurements
of distortion vs frequency at different levels. Right clicking on the graphs shows options
for the 3D settings and for the 3D colour scheme. Below is an example of a set of polar
response data, shown in a normalised view by setting the zero degree (on-axis) response as
the SPL reference.
The settings panel for the overlays 3D plot includes a Highlight data sets option to show the individual data sets that make up the plot.