Working with BPR Filters
Most NPR rendering can only be done through BPR filters. These are real-time effects applied to a BPR render, altering the image based on 2D and 3D information extracted from the Project. It can be based on the depth, the boundaries of the models, curvature, cavity, and much more.
Because these filters work with 3D data derived directly from the SubTools it is possible to achieve some effects which would be difficult to reproduce in a classic 2D editor like Photoshop. And the beauty of doing such work in ZBrush is that you can quickly change your point of view, load a different model, change the pose, etc. before instantly reproducing the same render and effect.
BPR filters are easy to use. You simply need to click on the one you want to select and then click on the white dot at its top corner to enable it. From there you can play with the sliders or turn on additional effects in the filter list to immediately see the result.
You can enable multiple filters on top of each other. The filters will be stacked with F1 being the first one applied which is then modified by F2 being applied and so on.
Even the cell shading look and its outline described in the previous chapter can actually be performed using only filters, without the need to modify material and mixer settings.
We strongly advise you to read more about the BPR filters on this page.