Trace option: X Clipping, Bounding Box Clipping

[zippy731]

Trace option to clip view at x = 0, also begin trace with vertex with lowest x value. With low vertex counts, would allow for motion effects, moving complex object/scene across X axis, trace would progress along object.

Alt: Y or Z axis modes
Alt: Use empty as driver for clipping.
Alt: Use bounding box of another object for clipping.