Default tolerance used in approximating non-cubic or rational
Nurbs:
curves with cubic beziers for display with PDF and GWL web-based
image displays (PNG or JPEG). Smaller values give better display fidelity
for very small objects at the expense of speed, larger values sacrifice
display fidelity for better speed. Default value is 0.01, which should give
decent performance but might give distorted rendering for extremely small objects.
This could be made to be somewhat adaptive, i.e. resetting itself on the fly
to a smaller value when dealing with smaller curves. Please let us know if you
think this would be useful.
Note that 3rd degree non-rational curves do not require approximation and are not
affected by this paramter.