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Document curved slice conformity and refinement limits

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Emily Boudreaux
2026-09-19 14:03:31 -04:00
parent 1d746b028e
commit f9355bdc8f
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experiments/MODEL_SLICES.md
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@@ -86,6 +86,16 @@ projecting reference positions of the deformed cut would be a different curve.
An exactly coplanar surface patch is reported as unsupported instead of being
silently drawn as a unique intersection curve.
The tetrahedral subdivisions are conforming inside each parent hexahedron,
but their face diagonals are not made globally consistent across differently
oriented neighboring elements. Boundary faces are triangulated independently
as well. On a curved shared face, these choices can produce slightly different
chord approximations: small gaps or overlaps between neighboring element fills,
or a mismatch between the colored edge and the independently drawn outline.
Deterministic ownership of a coincident planar face does not remove this curved
interface approximation. These image artifacts must not be interpreted as
physical gaps, jumps in geometry or an additional density feature.
Curved cuts are displayed using straight triangles and boundary chords. Field
colors are piecewise linear on those triangles, not exact values throughout
their interiors. Root tolerances, maximum physical-plane residuals, sampled
@@ -96,6 +106,15 @@ between subdivision vertices can be missed; compare subdivisions for image
stability. This visualization does not certify pointwise positivity or exclude
small unsampled features.
Before interpreting an actual FEM image, export the same saved state and plane
at two subdivision counts, for example 6 and 12 (or 4 and 8 for a first bounded
check). Compare the outlines, element-interface seams, sampled chord errors and
the visible density/enthalpy structure at the same axes and color ranges. The
pure geometry and plotting controls below do not test differently oriented
neighboring curved hexahedra and do not replace this export refinement check.
Globally consistent face triangulation would remove the diagonal mismatch;
it is not implemented in this bounded diagnostic.
## Checks
Every export runs pure geometric controls: unit-cube section area, integration