PointPusher posts a video looking at matching the focal and angle between the Autodesk Maya and ZBrush viewports. If you are working with both ZBrush and Maya, the way the view is described in each is a mismatch.
The current version of ZBrush has a slider drawing on focal angle which is similar to an angular field of view, while Maya uses a standard camera with focal length to describe its view. These two methods don’t really end up matching. That is to say that a value of 50 in ZBrush’s focal angle does not equate to Maya’s 50mm focal length.
Pointpusher notes that this tutorial is based on Kyle Hefley’s conversion charts. Kyle notes that it is possible to figure out the relationship between the two methods by knowing the maximum front facing FOV being 180°, making the scale slider for ZBrush have a range between 5-180° for forward facing perspective.
Kyle Hefley created the conversion charts based on some web camera and lens conversion tools. the charts use a Maya, focal length multiplier 1, and a standard DSLR, focal length multiplier 1.5 as a baseline in determining the right angle to use in ZBrush. Check out Kyle Hefley’s post on ZBrush focal Angle here.
