1. Finding the right ''mode'' for each layer (pass).
2. Finding the right combination between the layers (hierarchy) position,
what layer comes first, in order to avoid blocking underneath passes.
3. Adjusting the layer visibility (opacity) and add special effects in order to
fix render imperfections.
Let's start to practice right away with something very simple, just to get an
idea before we move to complicated passes combination. But before we do that lets see how we can get our VRay passes from 3DsMax.