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| ID | Project | Category | View Status | Date Submitted | Last Update | ||||
| 0006603 | VTK | (No Category) | public | 2008-03-13 21:35 | 2013-04-05 19:57 | ||||
| Reporter | Berk Geveci | ||||||||
| Assigned To | Zhanping Liu | ||||||||
| Priority | high | Severity | minor | Reproducibility | always | ||||
| Status | closed | Resolution | open | ||||||
| Platform | OS | OS Version | |||||||
| Product Version | |||||||||
| Target Version | Fixed in Version | ||||||||
| Summary | 0006603: Probing degenerate cells causes errors | ||||||||
| Description | I was given a triangle mesh with degenerate cells. Probing it with a high resolution line reveals that the interpolation near the degenerate triangles is really wrong. | ||||||||
| Steps To Reproduce | * Load the attached dataset * Probe it with a 1000 points line between (0.5, 0, 0) - (0.5, 2, 0) The result looks like the attached image (plotting temperature). | ||||||||
| Tags | No tags attached. | ||||||||
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| Attached Files |  mesh0.vtu [^] (1,431 bytes) 2008-03-13 21:35 bug.png [^] (16,427 bytes) 2008-03-13 21:36
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(0010801) Berk Geveci (administrator) 2008-03-14 07:51 |
I just found out that there are no degenerate triangles but lines instead. The bug is still there though. I am guessing FindCell() is choosing the line over the triangle when it shouldn't. |
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(0013730) Zhanping Liu (developer) 2008-10-06 10:40 |
BUG 0006603 has been fixed. The problem was due to the inappropriate selection of the tolerance (the initial value is too coarse), line #246 in vtkProbeFilter::ProbeEmptyPoints(...). Now the actual sampling rate is considered in determining the tolerance (see line #249 to line #264) and the problem disappears. If the squared tolerance is too large as is the case with the original code (0.005), a given sampling point, e.g., point #47 (whose coordinates are 0.47, 0.94), is mistakenly considered as grid point 8 (point Id = 8), i.e., the center of the plane because the squared distance between point #47 and the center is 0.0045. As a consequence, the proprty (temperature here) at the center point is simply taken as the one at the sample (point #47) and therefore a fluctuation occurs between point #46 and point 0000054. Now that the bug has been fixed, point #47 is considered to be within cell (triangle here) #5 and bary-centric interpolation is accordingly applied to obtain a correct temperature value at point #47 (the same for #47 ~ #53), both visually AND in terms of the line-based profile investigation. Thanks. new revision: 1.95; previous revision: 1.94 |
| Notes |
| Issue History | |||
| Date Modified | Username | Field | Change |
| 2008-03-13 21:35 | Berk Geveci | New Issue | |
| 2008-03-13 21:35 | Berk Geveci | File Added: mesh0.vtu | |
| 2008-03-13 21:36 | Berk Geveci | File Added: bug.png | |
| 2008-03-13 21:36 | Berk Geveci | Status | backlog => tabled |
| 2008-03-13 21:36 | Berk Geveci | Assigned To | => Will Schroeder |
| 2008-03-14 07:51 | Berk Geveci | Note Added: 0010801 | |
| 2008-09-25 15:37 | Berk Geveci | Assigned To | Will Schroeder => Zhanping Liu |
| 2008-10-06 10:40 | Zhanping Liu | Note Added: 0013730 | |
| 2008-10-06 10:41 | Zhanping Liu | Status | tabled => @80@ |
| 2011-06-16 13:11 | Zack Galbreath | Category | => (No Category) |
| 2013-04-05 19:57 | Berk Geveci | Status | customer review => closed |
| Issue History |
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