View Issue Details
| ID | Project | Category | View Status | Date Submitted | Last Update |
|---|---|---|---|---|---|
| 0033623 | Community | OCCT:Data Exchange | public | 2024-03-01 20:05 | 2024-04-22 14:10 |
| Reporter | robertlipman | Assigned To | ichesnokova | ||
| Priority | normal | Severity | major | ||
| Status | assigned | Resolution | open | ||
| Product Version | 7.8.0 | ||||
| Target Version | 7.8.2 | ||||
| Summary | 0033623: Data Exchange, Step Import - STEP tessellated geometry not reading | ||||
| Description | We have built a new version of the NIST software that converts STEP to x3d with OCCT 7.8.0. Unexpectedly, it seems like 7.8.0 processes STEP AP242 tessellated geometry. It works well in most cases. One case where it does not work is if triangulated_face is used instead of complex_triangulated_face. triangulated_face is not associated with any b-rep surfaces. Attached are two examples. We don't know if there are any settings that need to be used or if OCCT 7.8.0 just does not handle this case. | ||||
| Steps To Reproduce | See if the tessellated geometry can be processed from the files. | ||||
| Tags | No tags attached. | ||||
| Test case number | |||||
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Dear @robertlipman, please check the attachments. We have some problems with attachments in creating ticket time (they can be skipped) |
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Just for information, we have plans for x3d opensource reader and writer. As the next stage of VRML format. |
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Files recieved. |
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Hello @robertlipman. If we rely on recommended practices (https://www.mbx-if.org/documents/rec_prac_3dtess_geo_v11.pdf chapter 5.3), pnindex array for triangulated_face should contains indices of coordinate_list. But in rook-stl.stp file pnindex contains invalid indices. So it seems that the file doesn't correspond to the recommended practices. Could you please share, how the file was exported? |
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The file is created by the NIST software that converts an STL file to AP242 tessellated geometry. STL defines normals per face, however, in STEP normals are applied to coordinates, therefore there is a bug in my software. Attached is a fixed file where no normals are defined. Now pnmax=0, and both the normals and pnmax attributes are set to (). The only items defining the tessellated geometry are the coordinates_list and the triangles attribute on triangulated_face. The file was checked with conformance checking software and there are no problems. rook-stl.stp (94,183 bytes) |
| Date Modified | Username | Field | Change |
|---|---|---|---|
| 2024-03-01 20:05 | robertlipman | New Issue | |
| 2024-03-01 20:05 | robertlipman | Assigned To | => ika |
| 2024-03-01 22:41 | dpasukhi | Summary | STEP tessellated geometry not reading => Data Exchange, Step Import - STEP tessellated geometry not reading |
| 2024-03-01 22:45 | dpasukhi | Target Version | => 7.8.1 |
| 2024-03-01 22:45 | dpasukhi | Note Added: 0115212 | |
| 2024-03-01 22:51 | dpasukhi | Assigned To | ika => dpasukhi |
| 2024-03-01 22:53 | dpasukhi | Relationship added | related to 0033410 |
| 2024-03-01 23:04 | dpasukhi | Note Added: 0115218 | |
| 2024-03-18 18:12 | dpasukhi | Note Added: 0115413 | |
| 2024-03-18 18:12 | dpasukhi | Assigned To | dpasukhi => ichesnokova |
| 2024-03-18 18:12 | dpasukhi | Status | new => assigned |
| 2024-03-18 18:17 | dpasukhi | Relationship added | duplicate of 0029241 |
| 2024-04-19 23:09 | ichesnokova | Note Added: 0115754 | |
| 2024-04-20 00:48 | robertlipman | Note Added: 0115756 | |
| 2024-04-20 00:48 | robertlipman | File Added: rook-stl.stp | |
| 2024-04-22 14:10 | dpasukhi | Target Version | 7.8.1 => 7.8.2 |
