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IDProjectCategoryView StatusDate SubmittedLast Update
0026863Community[OCCT] OCCT:Visualizationpublic2015-11-11 19:342017-04-28 13:07
ReporterRoman Lygin 
Assigned Tobugmaster 
PrioritynormalSeverityfeature 
StatusclosedResolutionduplicate 
PlatformWindowsOSVC++ 2013OS Version32 bit
Product Version[OCCT] 6.9.1 
Target Version[OCCT] 7.2.0Fixed in Version 
Summary0026863: Weird visualization of the shape located at a very far point from axis origin
DescriptionThe enclosed small cone (about 5x5x5 mm) is located in a very far point (1200m, 800m, 0m). The model is real-world coming from a customer file.

Shading is very weird (see shading.png) and rotation triggers a lot of flickering.
Triangulation is fine - see triangulation.png

After moving the shape close to origin (0,0,0) display is fine.
Steps To Reproducerestore t.brep t
bounding t #small bounding box located very far
vinit
vdisplay t #weird display

restore t.brep t
ttranslate t 1199982.5707560785 800037.71111409366 -4.7890963413671246
vclear
vdisplay t #OK

TagsNo tags attached.
Test case number
Attached Fileszip file icon t.zip (5,844 bytes) 2015-11-11 19:34
png file icon shading.png (77,920 bytes) 2015-11-11 19:34
png file icon triangulation.png (124,747 bytes) 2015-11-11 19:35
png file icon shading_ok.png (83,674 bytes) 2015-11-11 19:35

- Relationships

-  Notes
(0048081)
kgv (developer)
2015-11-11 20:29

Dear Roman,

this is a known limitation caused by limited precision of float numbers (visualization uses single precision, thus precision issues occurs earlier than on modeling level usually using double precision floats).
(0048082)
Roman Lygin (developer)
2015-11-11 20:37

Thank you Kirill. That was among the guesses we had in a team.
Good to know you seem to be working already on this (#24393 is not accessible though).
(0065631)
kgv (developer)
2017-04-28 10:07

Dear bugmaster,

please close the issue as duplicate.

- Issue History
Date Modified Username Field Change
2015-11-11 19:34 Roman Lygin New Issue
2015-11-11 19:34 Roman Lygin Assigned To => kgv
2015-11-11 19:34 Roman Lygin File Added: t.zip
2015-11-11 19:34 Roman Lygin File Added: shading.png
2015-11-11 19:35 Roman Lygin File Added: triangulation.png
2015-11-11 19:35 Roman Lygin File Added: shading_ok.png
2015-11-11 20:24 kgv Relationship added related to 0024393
2015-11-11 20:24 kgv Severity minor => feature
2015-11-11 20:24 kgv Target Version 7.0.0 => 7.1.0
2015-11-11 20:29 kgv Note Added: 0048081
2015-11-11 20:37 Roman Lygin Note Added: 0048082
2016-10-25 09:43 kgv Target Version 7.1.0 => 7.2.0
2017-04-28 10:07 kgv Note Added: 0065631
2017-04-28 10:07 kgv Assigned To kgv => bugmaster
2017-04-28 10:07 kgv Status new => feedback
2017-04-28 10:07 kgv Resolution open => duplicate
2017-04-28 10:07 kgv Relationship replaced duplicate of 0024393
2017-04-28 13:07 bugmaster Status feedback => closed


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