Hi Robert -- Here's something that's stumped me for the past couple weeks: Why does CullVisitor have an apply(Group&)? It appears to be a copy of CullVisitor::apply(Node&), so I would think that if CullVisitor didn't override apply(Group&), then the base class NodeVisitor::apply(Group&) would get called, which (in turn) would result in CullVisitor::apply(Node&) getting called. From this line of thinking, CullVisitor::apply(Group&) appears to be redundant and unnecessary. Is there something going on C++-wise that makes this method a necessity? Paul Martz Skew Matrix Software LLC http://www.skew-matrix.com <http://www.skew-matrix.com/> 303 859 9466
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