[Svensen]

Hi, during the snap stage the snappyHexMesh generates illegal internal triangles (see attached images for comparison of original STL geometry and mesh generated by snappyHexMesh). The STL was checked with surfaceCheck, the log is the following:

triSurface$ surfaceCheck -checkSelfIntersection aneurysm.stl 

Reading surface from "aneurysm.stl" ...

Statistics:
Triangles    : 7462
Vertices     : 3733
Bounding Box : (-8.17053 -9.95681 -3.16317) (9.29674 5.487 18.3778)

Region    Size
------    ----
patch0    7462


Surface has no illegal triangles.

Triangle quality (equilateral=1, collapsed=0):
    0 .. 0.05  : 0
    0.05 .. 0.1  : 0
    0.1 .. 0.15  : 0
    0.15 .. 0.2  : 0
    0.2 .. 0.25  : 0
    0.25 .. 0.3  : 0
    0.3 .. 0.35  : 0
    0.35 .. 0.4  : 0
    0.4 .. 0.45  : 0.000402037
    0.45 .. 0.5  : 0.000268025
    0.5 .. 0.55  : 0.0010721
    0.55 .. 0.6  : 0.00160815
    0.6 .. 0.65  : 0.00254623
    0.65 .. 0.7  : 0.0032163
    0.7 .. 0.75  : 0.00402037
    0.75 .. 0.8  : 0.00522648
    0.8 .. 0.85  : 0.0087108
    0.85 .. 0.9  : 0.0305548
    0.9 .. 0.95  : 0.118467
    0.95 .. 1  : 0.823908

    min 0.409765 for triangle 7461
    max 0.999999 for triangle 6093

Edges:
    min 0.116441 for edge 2482 points (6.99224 0.323031 -1.78307)(6.89283 0.373643 -1.81644)
    max 0.771082 for edge 5440 points (-6.57135 -9.32061 1.086)(-6.66217 -9.95464 1.51533)

Checking for points less than 1e-6 of bounding box ((17.4673 15.4438 21.541) metre) apart.
Found 0 nearby points.

Surface is closed. All edges connected to two faces.

Number of unconnected parts : 1

Number of zones (connected area with consistent normal) : 1

Checking self-intersection.
Surface is not self-intersecting

End

There is no error, the settings for snappyHexMesh are also attached.

Maybe someone knows how to solve this problem ?