Standard callbacks: folding/unfolding nodes

Simple example criteria for simplifying the vertex tree.

vdsThresholdTest
A simple vdsFoldCriterion callback based on screen-space node extent
Routines for implementing standard criteria to decide when to fold and unfold nodes. The VDS library allows users to plug in their own criteria, in the form of vdsFoldCriterion callbacks to the vdsAdjust* routines, but most users will probably want to use the standard criteria implemented here.

See Also:
stdfold.c

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