Save and Restore

In one of the previous lessons, we learned to apply several transforms. But how do we remove the transforms, after we are done using them?

Reverse a transformation

It is possible to reverse a transform, by applying the inverse transform. For example, if we apply a translation (a, b), we can reverse it by applying a second translation (-a, -b), which puts us back where we started. We can reverse a scaling factor s, by applying a second scaling factor of ...