The physical position corresponding to the world minimum of the axis.
physicalMax
The physical position corresponding to the world maximum of the axis.
clip
if false, then physical value may extend outside worldMin / worldMax. If true, the physical value returned will be clipped to physicalMin or physicalMax if it lies outside this range.
Return Value
The transformed coordinates.
Remarks
Not sure how much time is spent in this often called function. If it's lots, then worth optimizing (there is scope to do so).