Rendering A Cross Section

I need to render a series of 2D cross sections of some 3D text as an animation.
This will then be played on an iPad and photographed on a long exposure to recreate the 3D model in a photo.
The process that I am attempting to copy is described here:
My only thought on how to achieve this was an orthographic camera and a moving plane that adjusted the transparency of the model as it moved through, but I don’t know how to do that.

Any help you can provide would be greatly appreachiated

Well, you may need to solidify your objects to make the cross section look nice but fiddling with camera clipstart and end will let you slice it up - you can animate these too. Another tip is if you use a perspective camera with a small lens angle, the distortion of a cut surface will make it visible.

eg I used it here with quick gsls renders to study how controllers work in the fluid sim:

Exactly what I needed, even though I didn’t really know what you meant about the small lens angle until I actually encountered the problem. Thanks for the help!