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|0029893||Open CASCADE||[OCCT] OCCT:Modeling Algorithms||public||2018-06-22 13:54||2018-06-25 16:14|
|Target Version||[OCCT] 7.4.0*||Fixed in Version|
|Summary||0029893: IntPatch_TheSOnBounds cannot find precise solution|
|Description||Class IntPatch_TheSOnBounds is used for computation IntPatch_Point(s) and putting them to IntPatch_Aline or IntPatch_GLine (and IntPatch_RLine but another initialization algorithm is used).|
Indeed the found solution must lie on the both surfaces strictly. However, the returned solution is in the distance 2.5177674590093085e-006 from the surface. It leads to wrong IntPatch_Point computation. After that, this bad IntPatch_Point is put to the intersection curve and bounds it incorrectly (intersection curve has become not closed).
As we can see in Steps To Reproduce, two solution is found. The 1st one is wrong the 2nd one is OK. If we try to use extrema then we will obtain the good IntPatch_Point but only one (2nd solution cannot be found by extrema).
Please note that the result of IntPatch_TheSOnBounds algorithm does not depend on the input tolerance.
|Steps To Reproduce||# Test bugs modalg_7 bug29807_i5001|
# Test parasolid doc_3 A4
binrestore [locate_data_file bug29807_f1.bin] f1
binrestore [locate_data_file bug29807_f2.bin] f2
mksurface s1 f1
mksurface s2 f2
trim s1 s1
trim s2 s2
# Take U-isoline of the cylindrical surface (s2)
uiso cc s2 0
# Its 2D-representation
line liso 0 0 0 1
# New DRAW-command (from the file). s1 - quadric surface; s2 - 2nd surface, which liso is chosen on.
# Later first and last parameters of iso-line and tolerance for computation are set.
sonbou s1 s2 liso -92588.227836497696 101953.32390724987 1.0e-4
# D1 = -2.5177674590093085e-006; P(120.7, 4.795054507370125, 5.6500000000000057) ==> WRONG
# D2 = 0; P(120.7, 8726.5714710291286, 5.6500000000000057) ==> OK
# Compute with another tolerance
sonbou s1 s2 liso -92588.227836497696 101953.32390724987 1.0e-7
# The same result
# Try to compute with extrema
extrema cc s1
# Only one extrema is found, which really precise the result found by "sonbou" command.
# But extrema cannot find 2nd solution which is found by "sonbou" command precisely
# 1.664854851506445e-012 ==> OK
and documentation updates
|Please use new DRAW-command from the file QABugs_InterSOnB.cxx to reproduce this problem in DRAW-application.|
|Tags||No tags attached.|
|Test case number|
|Attached Files||QABugs_InterSOnB.cxx (3,074 bytes) 2018-06-22 14:00|
|2018-06-22 13:54||nbv||New Issue|
|2018-06-22 13:54||nbv||Assigned To||=> msv|
|2018-06-22 14:00||nbv||File Added: QABugs_InterSOnB.cxx|
|2018-06-22 14:24||nbv||Relationship added||related to 0029807|
|2018-06-22 15:02||nbv||Steps to Reproduce Updated||View Revisions|
|2018-06-25 16:14||nbv||Steps to Reproduce Updated||View Revisions|
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