Generating a 3D volume from measured datapoints

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Hi,

I would like to generate a plot that should look like this:

ellipsoid(2,2,3,2,2,3)

but which is constructed from a set of matrices that contain values which can be classified by a threshold to be in- or outside the volume.

For example the data in this sample would look like this:

plane1=zeros(4,4)
plane2=zeros(4,4)
...

for all 6 planes in z-direction The matrix plane 3 in this example would therefor be the x-y representation of the central plane of the 3D cube. I now would like to apply a threshold, let say 3 and have every point with a larger value inside the volume and generate a volume plot from this. I am stuck since I do not know how to start this and appreciate every hint/help or comment. Thanks a lot, Philipp