OCCT (Open-Cascade-SAS)MCADConfidence: Medium

Fusing a solid with a copy of itself returns zero solids and zero volume, with IsDone true, no errors or warnings, and the empty result passes BRepCheck_Analyzer, while the input is 3296 mm3, and fusing the same instance with itself works.

Impact Analysis

Persona

Mechanical Designer

Team Size Impact

5x Multiplier

Prototype Delay

3 Days

Est. Annual Cost

$30,000

1 user · 1 month240 min
Rest of team960 min
Rest of year13,200 min

monthly_minutes × 12 × team_multiplier ÷ 60 × $75/hr = $30k/yr

$75/hr assumed rate.

Annual team-minutes decomposed from the reported monthly inputs.

Evidence & Sources

1 Sources

Open-Cascade-SAS/OCCT Issue #1687: BRepAlgoAPI_Fuse(S, Copy(S)) returns empty with IsDone=true while Fuse(S, S) succeeds (OCCT 7.9.3)

github.com

→

Analyst Notes

From the Grok pain-radar digests, Oct 27-28 2026 (Oct 27 8:41 AM ET through Oct 28 7:41 AM ET digests plus the Haitch editions). Verified live 2026-10-28: issue/PR/thread read; title and state confirmed.