View Issue Details
| ID | Project | Category | View Status | Date Submitted | Last Update |
|---|---|---|---|---|---|
| 0031672 | Community | OCCT:Data Exchange | public | 2020-07-17 19:44 | 2024-09-27 01:35 |
| Reporter | Alexandru | Assigned To | dpasukhi | ||
| Priority | normal | Severity | major | ||
| Status | new | Resolution | open | ||
| OS | Windows | ||||
| Product Version | 7.4.0 | ||||
| Summary | 0031672: Data Exchange, STEP Import- Surface wrongly recognized as degenerate torus | ||||
| Description | In the attached geometry, one of the surfaces is recognized as degenerated torus. The thing is: There is no torus in this simple geometry. See file attached. | ||||
| Tags | No tags attached. | ||||
| Test case number | |||||
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37.stp (3,959 bytes) |
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I suppose that torus surface is created from the following item in STEP file:
#61=DEGENERATE_TOROIDAL_SURFACE('',#42974,0.273874678843767,9.99999999999133,.F.);
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Forgot to say: I can load the STEP without any problems in SolidWorks. |
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> Forgot to say: I can load the STEP without any problems in SolidWorks. If it looks different in SolidWorks - it would be helpful also attaching screenshots. |
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temp.jpg (8,301 bytes) |
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I uploaded a screenshot of the actual geometry as section view. |
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The volume a rotational symmetry axis, that's why I choosed to show it as a section view |
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Solution elaboration & Testing 1) Updating of transfer STEP entity to geom not fixed the incorrect visualization. ( An example implementation is taken from the Xt format ) - The new resulting shape is a ylinder with rounded base surfaces. 2)SolidWork create a unexpected cutted form. - The created toroidal self-intersection surface is practically a sphere and does not lead to the formation of the shape obtained in SolidWork. |
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Just to confirm - I tried importing this same step-file in onShape, and got it interpreted as the expected result, i.e. a cylinder with rounded ends. See attached screenshot. section_view_37step.png (86,881 bytes) fullview37step.png (111,485 bytes) |
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So OnShape and SolidWorks can interpret the geometry correctly. I suppose, OnShape does not make use of the OCC parser, right? So the conclusion would be, that there is a bug in OCC (still). |
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With the caveat that I have no way of knowing what library, if any, is used for step-interpretation in onShape - that would be the conclusion yes. I recently raised a new issue (see related 0033618) before being aware of this one. |
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Very happy to hear, that I'm not the only one with this issue. I allow myself to link to your new issue: https://tracker.dev.opencascade.org/view.php?id=0033618 |
| Date Modified | Username | Field | Change |
|---|---|---|---|
| 2020-07-17 19:44 | Alexandru | New Issue | |
| 2020-07-17 19:44 | Alexandru | Assigned To | => gka |
| 2020-07-17 19:44 | Alexandru | File Added: 37.stp | |
| 2020-07-24 12:36 | kgv | Product Version | => 7.4.0 |
| 2020-07-24 12:36 | kgv | Summary | Surface wrongly recognized as degenerate torus => Data Exchange, STEP reader - Surface wrongly recognized as degenerate torus |
| 2020-07-24 12:38 | kgv | Note Added: 0093284 | |
| 2020-07-24 12:42 | Alexandru | Note Added: 0093285 | |
| 2020-07-24 13:04 | kgv | Note Added: 0093289 | |
| 2020-07-24 15:04 | Alexandru | File Added: temp.jpg | |
| 2020-07-24 15:05 | Alexandru | Note Added: 0093291 | |
| 2020-07-24 15:09 | Alexandru | Note Added: 0093292 | |
| 2020-08-26 12:10 |
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Assigned To | gka => dpasukhi |
| 2021-02-28 23:43 | dpasukhi | Note Added: 0099230 | |
| 2021-02-28 23:44 | dpasukhi | Note Edited: 0099230 | |
| 2024-03-07 16:22 | dpasukhi | Relationship added | related to 0033618 |
| 2024-03-08 11:15 | ebknudsen | Note Added: 0115277 | |
| 2024-03-08 11:15 | ebknudsen | File Added: section_view_37step.png | |
| 2024-03-08 11:15 | ebknudsen | File Added: fullview37step.png | |
| 2024-03-08 11:56 | Alexandru | Note Added: 0115279 | |
| 2024-03-08 12:22 | ebknudsen | Note Added: 0115280 | |
| 2024-03-08 12:32 | Alexandru | Note Added: 0115281 | |
| 2024-09-25 11:00 | dpasukhi | Summary | Data Exchange, STEP reader - Surface wrongly recognized as degenerate torus => Data Exchange, STEP Import- Surface wrongly recognized as degenerate torus |
