Plot 2D slice view of any angle

Shawn Fan wrote: Hi, I have a 3d plot on an rectangle range within x-y, I want to have a 2d slice view of the diagonal. Is there a way to achieve this ?

There are several possibilities. Possibly the most straightforward is to create a special variant of your u_h function that accepts only one parameter and returns the x, y co-ordinates on the diagonal and the value of u_h, for those points. Then use CreateSpace to plot this function.

Stuart