Re: [eigen] Rotations and unit vectors

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Hi Benoit,

On Tue, May 7, 2013 at 4:47 PM, Benoit Jacob <jacob.benoit.1@xxxxxxxxx> wrote:
But it's probably never OK to assert on anything that can depend on floating point values: that gives too finicky crashes (it doesn't help much that it's only #ifndef NDEBUG).

Could you explain why you think this is an issue? What kind of crashes are you referring to? When I hit an assert in a debug session, I get the exact line in my source code in which the error occurred. If I were seeing something like

assert( abs(axis.squaredNorm() - 1) > eps); // just an example

maybe even with a comment, there is hardly a more simple method to point me directly to the issue. Maybe that's different on other systems.

I already like the idea of a loose threshold (e.g. sqrt(numeric_limits<double>::epsilon())) as suggested by Gael.. Any code which triggers such a threshold e.g. due to numerical issues definitely has a problem and by quietly accepting these values we only delay the issue from surfacing.


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