0029359: Approximation algorithm computes multidimensional distance in Euclidean space incorrectly Wrong distance computation has been corrected. Some test-cases have been corrected according to their new behavior. Namely, built (by approximation algorithm) curve(s) has changed its geometrical position. 1. tests/blend/simple/X4 It is not a regression because the result is not correct on both MASTER and FIX (see explanation in the issue #26740). This problem is expected to be solved after porting Fillet-algorithm to new Boolean operation. Old Boolean operations do not cover Edge-Edge tangent-zone by vertex. 2. tests/bugs/modalg_6/bug27341_318 "checknbshapes" has been deleted in order to avoid non-stable behavior (see issue #29360) of this test case. New result is OK on both Linux and Windows platform.

0027830: Infinite HLR looping Make protection of HLR algo against garbage data in faces. In particular case, there are faces built on a periodical surfaces, which U bounds exceed period thousands times. Such faces are excluded from the process of edges hiding. In addition, while fitting the intersection point in period for periodical faces, replace looping with the single call to AdjustPeriodic method. - Add new test case. - Update tests of HLR according to new numbers of subshapes. Update of test cases according to the new behavior

0027719: HLRBrep_Algo incorrect output Intersection of curves and surfaces in HLRBRep is corrected: parametric limits of face are used instead of parametric limits of surface Building of outlines (Contap_Contour) is corrected: method ComputeCloseLine is now used in all cases. Correction of HLRBRep_Surface: usage of UVbounds-option Correction of test cases according to the new behavior.

0027557: Unstable HLR tests The following modifications were done for stability: - Precision::PConfusion() was set as parameter of Classifier instead of 0.0 - Coinciding vertices of outlines are united to exclude neighborhood of common vertex from curve-curve intersection - Draw command "hlrin3d" was modified to prevent exception Minor corrections Corrections of test cases for issue CR27557

0027341: Incorrect exact HLR results - removal of excess interferences in case of simple hiding face - correct processing of boundary edges coinciding with outlines - change of API for testing Draw Command - correction of Draw command "build3d" - test cases are added. Linux reference data is changed. Partially fixed 0027340: Insufficient exact HLR speed Number of samples in PolyPoly intersection algorithm tuned in each instance of generic class. Default number of the samples in Geom2dAdaptor is changed according to the Adaptor2d_Curve2d class. Minimal number of points in case of B-Spline is changed. Minimal number of samples support is added in intersection algorithms.