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5185b1617a
The matter was that with starting point paased into intersector the walking line goes one point outside of the surface domain. Then during purging this extra point is removed from the line but its geometry is used for the last vertex. This makes a set of points invalid for approximation, and as a result we obtain the curve with reversed tangent direction at the end. The API of the method IntPatch_WLineTool::ComputePurgedWLine has been changed to insert a new Boolean parameter RestrictLine. If this parameter is false than the step of removing of outside points is skipped, and the result line is not distorted. This flag is determined inside IntTools_FaceFace to tell the intersector if it is needed to limit intersection line by surface domain. Test case has been added.