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IDProjectCategoryView StatusDate SubmittedLast Update
0021753Open CASCADE[OCCT] OCCT:Visualizationpublic2010-05-21 18:482018-11-18 13:50
Reporterabv 
Assigned Toabv 
PrioritynormalSeverityminor 
StatusfeedbackResolutionopen 
PlatformOSAllOS Version
Product Version 
Target Version[OCCT] 7.4.0*Fixed in Version 
Summary0021753: Visualization - improve shaded display of conical objects
DescriptionShading of truncated conical objects in OCC viewer looks as if Gouraud shading
was not applied: edges between triangles are very visible due to sharp change
of reflected color. See attached image (shaded_cone.gif).

Note that in case of cylinder (or even cone very close to cylinder) shading is
very nice and smooth (see shaded_cylinrdical_cone.gif).

Also shading is smooth for most of the surface of complete cone, though it is
bad on its seam (see shaded_complete_cone.gif).

Here are DRAW commands to create test cones shown on pictures:

- Truncated cone:
Draw{}> pcone p 1 100 100

- Cylindrical cone:
Draw[]> pcone p 99 100 100

- Complete cone:
Draw[] pcone p 0 100 100

The problem is clearly connected with the fact that normals at the corners of
the triangles (used for smoothing) are not taken from the surface but computed
somehow like by averaging normals of each two neighboring triangles. In the
case of truncated cone well-shaped triangles are alternating with very narrow
ones, and likely this causes normals to be computed inadequately.

To solve this problem we can either take normals directly from underlying
surface (which is most correct approach, though probably not so fast), or
improve somehow current algorithm (e.g. do averaging of normals using weights
proportional to area / angle of each triangle connected in the node).
TagsNo tags attached.
Test case numberNot needed
Attached Filesgif file icon shaded_cone.gif (34,615 bytes) 2010-05-21 18:48
gif file icon shaded_cylinrdical_cone.gif (19,312 bytes) 2010-05-21 18:49
gif file icon shaded_complete_cone.gif (32,209 bytes) 2010-05-21 18:49
jpg file icon badTruncConeR10.JPG (36,644 bytes) 2010-08-16 13:54
jpg file icon badSeamEdge.JPG (35,635 bytes) 2010-08-16 13:55
png file icon ConeComparison_1.png (335,213 bytes) 2013-10-11 16:09
png file icon ConeComparison_2.png (271,815 bytes) 2013-10-11 16:10
png file icon ConeNormals.png (163,422 bytes) 2013-10-11 16:10
png file icon cone_KO.png (99,446 bytes) 2016-05-05 17:37
png file icon cone_OK.png (95,514 bytes) 2016-05-05 17:37
png file icon cone_KO_phong.png (99,971 bytes) 2016-05-05 17:38
png file icon cone_OK_phong.png (96,797 bytes) 2016-05-05 17:38
png file icon CR21753.png (143,722 bytes) 2016-05-10 21:16
png file icon sphere.png (529,862 bytes) 2016-06-15 19:56

- Relationships
related to 0024268closedbugmaster Open CASCADE Wrong triangulation on the boundaries of the cones 
related to 0024250closedbugmaster Open CASCADE TKOpenGl - per-pixel lighting using GLSL program (Phong shading) 

-  Notes
(0026053)
dbp (developer)
2013-10-11 16:17

The rendering results with Phong shading shader program was attached:

1. ConeComparison_1.png shows smooth-looking shading on "regular" triangles of the cone.

2. ConeComparison_2.png shows discontinuity in colors on the "border" edge.

3. ConeNormals.png shows result of simple "normal" shader: normals are treated as colors. It is easy to see that surface normals are discontinuous.
(0053839)
kgv (developer)
2016-05-05 14:10

These degenerated cases can not be (efficiently) handled on visualization layer after triangulation has been already computed.

Thus, most optimal solution to avoid visual artifacts would be extending BRepMesh algorithm with an option to prepare triangulation taking into account limitations of visualizer. E.g. degenerative vertex should be duplicated in triangulation (with different precomputed normales); narrow triangles should be split into more triangles (cut cone).
(0053861)
git (administrator)
2016-05-05 17:35

Branch CR21753 has been created by kgv.

SHA-1: 533ef08392537212dc115116d305d37885cc594a


Detailed log of new commits:

Author: kgv
Date: Thu May 5 17:35:24 2016 +0300

    0021753: Visualization - improve shaded display of conical objects
    
    StdPrs_ShadedShape - duplicate nodes originated from degenerated edge with normal to triangle.
(0053864)
kgv (developer)
2016-05-05 17:44

You can see the prototype implementing handling of degenerated Edge on StdPrs_ShadedShape level in branch CR21753. The nodes originated from degenerated Edge are duplicated with normal computed from triangle itself.

Note that apart from normal it is not possible to restore UV texture coordinates for such duplicated nodes at StdPrs_ShadedShape. So extending triangulation algorithm might provide better results.
(0053975)
abv (manager)
2016-05-10 21:18

I confirm that the fix produces much better image on full cone than on master. There seem to be no visible difference in how textures ae mapped. See attached image CR21753.png.
(0054057)
kgv (developer)
2016-05-16 14:28

> There seem to be no visible difference in how textures ae mapped.
> See attached image CR21753.png.
Patch does not introduce changes for UV texture coordinates - at visualization time there is not information to guess / reconstruct this information properly for available degenerate node.

Therefore texture is mapped with artifacts near to the cone top.
(0054935)
kgv (developer)
2016-06-14 09:56

Please review the patch.
(0054950)
san (developer)
2016-06-14 13:49

Branch CR21753 reviewed without remarks, ready for testing.
(0054970)
git (administrator)
2016-06-14 16:39

Branch CR21753 has been updated forcibly by mkv.

SHA-1: 9a17f43739c389010e77f841f5db1043c2edfe56
(0055015)
mkv (tester)
2016-06-15 14:18

Dear BugMaster,
Branch CR21753 was rebased on current master of occt git-repository.
SHA-1: 9a17f43739c389010e77f841f5db1043c2edfe56
(0055016)
mkv (tester)
2016-06-15 14:18

Dear BugMaster,
Branch CR21753 from occt git-repository (and master from products git-repository) was compiled on Linux, MacOS and Windows platforms and tested on Release mode.
SHA-1: 9a17f43739c389010e77f841f5db1043c2edfe56

Number of compiler warnings:

occt component :
Linux: 0 (0 on master)
Windows: 0 (0 on master)
MacOS : 0 (0 on master)

products component :
Linux: 72 (72 on master)
Windows: 4 (4 on master)
MacOS : 1148

Regressions/Differences/Improvements:
http://occt-tests/CR21753-master-OCCT/Debian70-64/summary.html [^]
http://occt-tests/CR21753-master-OCCT/Windows-64-VC10/summary.html [^]
Failed:
  bugs vis bug173_1, bug173_2, bug173_3, bug22701
  bugs xde bug23969
http://occt-tests/CR21753-master-Products/Debian70-64/summary.html [^]
http://occt-tests/CR21753-master-Products/Windows-64-VC10/summary.html [^]
Failed:
  dxf read F5, F7, G1
  sat read E6

Testing cases:
Not needed

Testing on Linux:
occt component :
Total MEMORY difference: 88221360 / 88097063 [+0.14%]
Total CPU difference: 19506.319999999985 / 19425.25999999997 [+0.42%]
products component :
Total MEMORY difference: 27499885 / 27490548 [+0.03%]
Total CPU difference: 5127.929999999984 / 5118.629999999994 [+0.18%]

Testing on Windows:
occt component :
Total MEMORY difference: 55878201 / 55844043 [+0.06%]
Total CPU difference: 18285.095611398763 / 19040.46805349891 [-3.97%]
products component :
Total MEMORY difference: 18657026 / 18608765 [+0.26%]
Total CPU difference: 4980.4723258999475 / 5052.700788899949 [-1.43%]

There are following differences in images found by testdiff.
http://occt-tests/CR21753-master-OCCT/Debian70-64/diff-Debian70-64.html [^]
http://occt-tests/CR21753-master-OCCT/Windows-64-VC10/diff-Windows-64-VC10.html [^]
IMAGE v3d materials bug24855: bug24855_gold.png differs
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http://occt-tests/CR21753-master-Products/Debian70-64/diff-Debian70-64.html [^]
http://occt-tests/CR21753-master-Products/Windows-64-VC10/diff-Windows-64-VC10.html [^]
IMAGE parasolid read C5: C5.png differs
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IMAGE parasolid read B9: B9.png differs
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IMAGE sat read E4: E4.png differs
(0055017)
mkv (tester)
2016-06-15 14:19

Dear kgv,
Branch CR21753 has been rejected due to:
- regressions/differences/improvements
- differences in images
(0055047)
git (administrator)
2016-06-15 19:48

Branch CR21753 has been updated by kgv.

SHA-1: db453edb9834f1fd17e90d3eae94bba3a9371ae9


Detailed log of new commits:

Author: kgv
Date: Wed Jun 15 19:48:20 2016 +0300

    fix index of degenerated vertex within multiple faces

(0055048)
kgv (developer)
2016-06-15 19:57

Using normal to the entire triangle introduces artifacts on the sphere (see sphere.png).
(0080850)
oan (developer)
2018-11-07 16:58

Please check after integration of #28379.

- Issue History
Date Modified Username Field Change
2010-05-21 18:48 abv CC => san
2010-07-29 13:59 bugmaster Assigned To bugmaster => abv
2010-07-29 13:59 bugmaster Status new => assigned
2011-08-02 11:31 bugmaster Category OCCT:MOA => OCCT:Modeling Algorithms
2013-08-30 17:57 abv Assigned To abv => san
2013-08-30 17:57 abv Category OCCT:Modeling Algorithms => OCCT:Visualization
2013-08-30 17:57 abv Fixed in Version EMPTY =>
2013-08-30 17:57 abv Description Updated View Revisions
2013-10-11 08:32 abv Relationship added related to 0024250
2013-10-11 15:53 san Assigned To san => dbp
2013-10-11 16:09 dbp File Added: ConeComparison_1.png
2013-10-11 16:10 dbp File Added: ConeComparison_2.png
2013-10-11 16:10 dbp File Added: ConeNormals.png
2013-10-11 16:17 dbp Note Added: 0026053
2014-02-13 10:43 kgv Relationship added related to 0024268
2014-02-13 10:47 kgv Severity trivial => minor
2014-02-13 10:47 kgv Target Version => 6.7.1
2014-04-04 18:16 abv Target Version 6.7.1 => 6.8.0
2014-09-26 09:28 abv Target Version 6.8.0 => 7.1.0
2016-05-05 14:10 kgv Note Added: 0053839
2016-05-05 14:10 kgv Assigned To dbp => abv
2016-05-05 17:26 kgv Summary Bad smoothing in shaded display of conical objects => Visualization - improve shaded display of conical objects
2016-05-05 17:35 git Note Added: 0053861
2016-05-05 17:37 kgv File Added: cone_KO.png
2016-05-05 17:37 kgv File Added: cone_OK.png
2016-05-05 17:38 kgv File Added: cone_KO_phong.png
2016-05-05 17:38 kgv File Added: cone_OK_phong.png
2016-05-05 17:44 kgv Note Added: 0053864
2016-05-05 17:44 kgv Status assigned => feedback
2016-05-10 21:16 abv File Added: CR21753.png
2016-05-10 21:18 abv Note Added: 0053975
2016-05-10 21:19 abv Assigned To abv => kgv
2016-05-16 14:28 kgv Note Added: 0054057
2016-05-16 14:28 kgv Assigned To kgv => abv
2016-06-14 09:56 kgv Note Added: 0054935
2016-06-14 09:56 kgv Assigned To abv => san
2016-06-14 09:56 kgv Status feedback => resolved
2016-06-14 13:49 san Note Added: 0054950
2016-06-14 13:49 san Assigned To san => bugmaster
2016-06-14 13:49 san Status resolved => reviewed
2016-06-14 16:26 mkv Assigned To bugmaster => mkv
2016-06-14 16:39 git Note Added: 0054970
2016-06-15 14:18 mkv Note Added: 0055015
2016-06-15 14:18 mkv Note Added: 0055016
2016-06-15 14:19 mkv Note Added: 0055017
2016-06-15 14:19 mkv Assigned To mkv => kgv
2016-06-15 14:19 mkv Status reviewed => assigned
2016-06-15 14:19 mkv Test case number => Not needed
2016-06-15 19:48 git Note Added: 0055047
2016-06-15 19:56 kgv File Added: sphere.png
2016-06-15 19:57 kgv Note Added: 0055048
2016-06-16 10:34 kgv Assigned To kgv => abv
2016-10-25 09:38 kgv Target Version 7.1.0 => 7.2.0
2017-01-23 13:47 kgv Relationship added related to 0028379
2017-07-20 11:29 kgv Target Version 7.2.0 => 7.4.0*
2018-11-07 16:58 oan Note Added: 0080850
2018-11-07 16:58 oan Status assigned => feedback


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