On 07/22/2017 04:42 AM, Giovanni Di Ilio wrote:
Yes, I agree, the issue is definitely related to round-off error. But I still
don't understand why the mapping fails, if the vertex coordinates read in from
my .msh file are apparently stored as doubles...
Anyway, yes, the problem is easily overcome by "manipulating" the values
before mapping.
The numbers you consider differ in the last two or three bits when stored as
double precision. Any computations you do with them, for example in the
mapping, will then necessarily be completely off.
Best
W.
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