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Vessels vibrate and disintegrate, sending pieces flying off at absurd speeds, in Galileo #2611

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eggrobin opened this issue Jun 24, 2020 · 1 comment · Fixed by #2626
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@eggrobin
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Reported by @lpgagnon and @RCrockford.

Bisection shows that the issue is not in Fuchs, it is in Galileo, and it is present at da3e0cd, so it is not introduced by #2604.

@lpgagnon has provided us with a journal, https://drive.google.com/file/d/18vpqxV8rutitvKF7WeUfiTFGXnUOdX8g/view?usp=sharing.

@pleroy
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pleroy commented Jun 24, 2020

Replaying this journal at 2020062107-Galileo-0-g5fa2cecbd475e10034d64b4c4c795bc0003858ec-dirty I am seeing the following quaternion:

0.706907 + 5.66119814470942540e-07 i + 1.25822775266156025e-03 j - 1.67650874336922225e-02 k

the norm of which is +7.07106759520813810e-01, which is not close to 1. The stack is (who would have thought) in Diagonalize:

    @   000007FEC66E4E3E      principia::geometry::internal_rotation::Rotation<principia::geometry::internal_frame::Frame<enum principia::serialization::Frame_PluginTag,2,1,18>,principia::geometry::internal_frame::Frame<enum principia::serialization::Frame_PluginTag,1,1,11> >::Rotatio [0x000007FEC66E4E3D+733] (C:\Users\phl\Projects\GitHub\Principia\Principia\geometry\rotation_body.hpp:97)
    @   000007FEC66D9015      principia::geometry::internal_rotation::Rotation<principia::geometry::internal_frame::Frame<enum principia::serialization::Frame_PluginTag,2,1,18>,principia::geometry::internal_frame::Frame<enum principia::serialization::Frame_PluginTag,1,1,11> >::Rotatio [0x000007FEC66D9014+548] (C:\Users\phl\Projects\GitHub\Principia\Principia\geometry\rotation_body.hpp:127)
    @   000007FEC66DD7A6      principia::geometry::internal_symmetric_bilinear_form::SymmetricBilinearForm<principia::quantities::internal_quantities::Quantity<principia::quantities::internal_dimensions::Dimensions<2,1,0,0,0,0,0,0> >,principia::geometry::internal_frame::Frame<enum pri [0x000007FEC66DD7A5+1781] (C:\Users\phl\Projects\GitHub\Principia\Principia\geometry\symmetric_bilinear_form_body.hpp:186)

Too late to do numerical analysis, to be continued...

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