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Set timestamp on priors on constant parameters#6

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SimonTagne wants to merge 1 commit intomasterfrom
timestamp-on-constant-priors
Open

Set timestamp on priors on constant parameters#6
SimonTagne wants to merge 1 commit intomasterfrom
timestamp-on-constant-priors

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The timestamp of the prior edge was not initialized, resulting in:

  • Unrepeatable output since uninitialized memory is written as timestamp in output files.
  • Occasional crashes when using multiple prior edges on the same parameter, since the timestamp can be NaN, which triggers undefined behavior (materialized as floating point exception) when used as keys in a map. World coordinates of GCPs in ROAMvision have 2 priors and thus occasionally trigger the problem

There is no significant timestamp value for a prior on a constant parameter, so fixing this parameter as 0.0 seems reasonnable. This patch increments the used value by 1.0 for every additionnal prior added to the same parameter since the ROAMlog code expects the (Category, timestamp) tuple to uniquely identify an edge (using 0.0 for all priors would result in only one being logged).

The timestamp of the prior edge was not initialized, resulting in:
- Unrepeatable output since uninitialized memory is written as
  timestamp in output files.
- Occasional crashes when using multiple prior edges on the same
  parameter, since the timestamp can be NaN, which triggers undefined
  behavior (materialized as floating point exception) when used as
  keys in a map. World coordinates of GCPs in ROAMvision have 2
  priors.

There is no significant timestamp value for a prior on a constant
parameter, so fixing this parameter as 0.0 seems reasonnable. This
patch increments the used value by 1.0 for every additionnal prior
added to the same parameter since the ROAMlog code expects
the (Category, timestamp) tuple to uniquely identify an edge (using
0.0 for all priors would result in only one being logged).
@SimonTagne SimonTagne requested a review from DavideACucci May 5, 2026 09:38
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