new plots ignore vtkValidPtMask
This issue was created automatically from an original Mantis Issue. Further discussion may take place here.
3.4 plots obeyed an array called vtkValidPtMask so that extraneous probed values were not plotted (as 0). 3.6 plots do not.
Make a time source that moves, plot location over time somewhere that the object covers only some of the time. When the shape moves away from probe, the plot shows 0, it should not show anything at all during those moments.