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OpenCASCADE (OCCT)MCADConfidence: Medium

Since OCCT 7.7.0, spherical or toroidal STEP faces with a clockwise outer boundary import as the complement of the bounded patch: 18 spherical faces on a Pro/ENGINEER model grew from 693.8 to 42,569.7 mm2 while BRepCheck_Analyzer calls every face valid. A shape-healing heuristic mistakes the explicit outer boundary for a hole.

Impact Analysis

Persona
Mechanical Designer
Team Size Impact
5x Multiplier
Prototype Delay
2 Days
Est. Annual Cost
$12,000
  • 1 user · 1 month180 min
  • Rest of team720 min
  • Rest of year9,900 min

monthly_minutes × 12 × team_multiplier ÷ 60 × $75/hr = $12k/yr

$75/hr assumed rate.

Annual team-minutes decomposed from the reported monthly inputs.

Evidence & Sources

1 Sources
Open-Cascade-SAS/OCCT issue #1652: spherical/toroidal STEP faces with a clockwise outer boundary read as the complement of the patch since 7.7.0
github.com
→

Analyst Notes

From the Grok ProductFlo pain-radar digest, Oct 20 2026. Verified live 2026-10-20: full issue read with measured areas on 7.7.0 through 8.0.1, a git bisect to the healing commit, and a synthetic reproduction file. Different issue from known OCCT #1643.