Hello,
I'm currently working on some fluid modelling and get a bunch of 4D
data  mostly velocity field in cartesian coordinates.
I'm wondering if it is possible to make a 3D plot of this data by
limiting the range of 4th data column?
For example to plot v(x,z), but only for a certain value of y.
A simpler but essentially the same problem is to make a 2D plot from
3D data  eg. to plot v(z) for a specified value of y.
I know I can make a 3D plot with a range limit for one axis, but it's
still a 3D plot which contains only 2D data, so it's not what I want.
Anyone can help?
greetings,
Paweł
