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| ID | Project | Category | View Status | Date Submitted | Last Update |
| 0031437 | Community | [OCCT] OCCT:Modeling Data | public | 2020-03-18 11:24 | 2020-09-15 12:09 |
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| Reporter | Roman Lygin | |
| Assigned To | msv | |
| Priority | normal | Severity | crash | |
| Status | new | Resolution | open | |
| Platform | | OS | | OS Version | |
| Product Version | [OCCT] 7.1.0 | |
| Target Version | [OCCT] 7.6.0* | Fixed in Version | | |
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| Summary | 0031437: Modeling Data - Offset surface throws exception when trying to evaluate at singularity point |
| Description | The offset surface comes from Parasolid. The underlying surface is a B-Spline (apparently from surface of revolution) and has a singularity.
Geom_OffsetSurface cannot be evaluated at the singularity point as the normal to the base surface cannot be evaluated. In fact, the normal can be evaluated - just need a more adapted algorithm to compute at singularity.
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| Steps To Reproduce | In DRAW:
restore bs
offset os bs -2.5
or
restore os
An exception was caught 0000000003C12620 : Geom_UndefinedValue: GeomEvaluator_OffsetSurface::CalculateD0(): Unable to calculate normal
** Exception ** 0000000003C12620 : Geom_UndefinedValue: GeomEvaluator_OffsetSurface::CalculateD0(): Unable to calculate normal |
| Tags | No tags attached. |
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| Test case number | |
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| Attached Files |  surface.zip (1,048 bytes) 2020-03-18 11:24
 screenshot.png (22,763 bytes) 2020-03-18 11:25 |
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