Warren, could you kindly quote enough of what you're responding to, or at explain enough about it, so that your response will make a nonzero amount of sense? --Dan On 2013-07-19, at 3:04 PM, Warren D Smith wrote:

a good solution to the geometry consistency problem is to use exact arithmetic. More precisely, you use ordinary lo-precision arithmetic except when it gets dicey, then you go for more precision... the net effect is, hi-precision calculations are rarely needed, so it is efficient.

This is a pain, but it solves everything.