Q:

Reversing one axis in Plot3D

When I rotate my 3D plot to the desired viewpoint my X axis runs from 1 at the left to 0 at the right. How can I mirror my plot so that 0 will be at the left and 1 at the right? 
Extra credit: how can I get the ViewPoint vector after manual rotation?

A:

To answer the last part of question, this can be done by setting something like ViewPoint -> Dynamic[vp] in the plot definition. Then the value of vp will be dynamically updated to the current view point when you rotate the plot. Try for example
Plot3D[x^4 y, {x, 0, 1}, {y, 0, Pi}, PlotRange -> All, ViewPoint -> Dynamic[vp]]
Dynamic[vp]

Note that vp must be defined as a triple of numbers.
As for the first part of your question, I don't know how you're creating your plot, but if you're using Plot3D you could just swap the second and third argument. For example
vp = {1, 1, 1};
Plot3D[x^4 y Sin[5 y], {x, 0, 1}, {y, 0, Pi}, PlotRange -> All, 
 ViewPoint -> Dynamic[vp]]
Plot3D[x^4 y Sin[5 y], {y, 0, Pi}, {x, 0, 1}, PlotRange -> All, 
 ViewPoint -> Dynamic[vp[[{2, 1, 3}]]]]

Note that this will effectively swap the x- and y-axis, thus changing the coordinate system from being right-handed to left-handed. 

