Stage 0 of ADR #282. A lattice node is k/240, which has no exact binary
representation, and a stored coordinate is a float. Nobody could say how much of
a real plan is affected, and Optimize promises to remove coordinate noise
without a definition of noise that can be checked.
latticeProfile splits every coordinate of the model into three populations,
because they are three different problems: exactly on a node, near a node but
not exact, and legitimately off grid. The middle one is the defect class behind
\#258, \#279 and the non-converging Optimize; the last one is authored geometry
the current model allows and must not be called a violation.
Measured on the owner's installation: space 1 has 208 coordinates, 33.65 per
cent exactly on a node and 65.38 per cent in the noise class; space 2 has 21.23
against 78.77. The worst deviation is 8e-8 of a step — invisible, and enough to
put a wall key in the neighbouring bucket.
The counterpart is what makes it worth having: every shipped fixture has zero
noise, all of its off-grid values being authored. Our own test data therefore
cannot reproduce this class by construction, which is why the owner finds these
defects and the gates do not. A test pins that property so it cannot drift.
No violations are produced, no gate turns red, and nothing is repaired: what to
do with a vertex 8e-8 from a node is the owner's decision, and this measures its
price first.
Issue: #283
User-Visible: no
Claude
a988f7c6f1