The problem is that most STL files contain very long thin triangles that are unsuitable for finite-element analysis. Perhaps it was my failure to find the correct settings but I was unable to get a consistently useful finite-element mesh from Gmsh when the import format was STL. So from now on, STEP geometry with the Gmsh auto-mesher is the recommended format for SonoAnalyzer's user-geometry models.įor STL files the results were different. Given STEP files of the most challenging geometries I found Gmsh to be much more versatile - more tolerant of coarse meshes and at the same time less likely to crash on fine meshes. While looking for solutions to these hard-to-mesh models I tried out Gmsh, another open-source mesh generator similar to Netgen (which SonoAnalyzer has used since version 2). So getting the mesh setting "just right" is a challenge. In some cases this would lead to a situation where setting a coarse mesh would cause meshing to fail (because it couldn't follow the fine detail in the shape) and setting a fine mesh would cause an out-of-memory crash. This was often a problem with relatively large structures containing fine detail the fine detail demands a fine mesh but extending the fine mesh to include the entire object becomes very time-consuming and can cause out-of-memory errors. In most cases though the problem was more subtle: the geometry provided was perfectly valid but difficult to mesh. surfaces that didn't join up) or surface / shell geometry that the mesher was unable to convert to solid. ![]() Some files contained invalid geometry (eg. I found a wide range of different issues causing the meshing failures. If any of you would like a response specifically addressing your geometry please email me directly. Rest assured that all design information sent will be kept strictest confidential. Many thanks to all who did - I really appreciate both the value of the information provided and the trust you have placed in me. Several clients have been kind enough to agree. In the event of a meshing failure SonoAnalyzer will open a dialog requesting that information about the problem be sent to help improve the SonoAnalyzer program. The main focus of this release is improving the mesh generation for user-geometry (imported STEP and STL files).
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