Hi ,
STL files can be imported into HyperMesh, You need to use File > Import > File type > STL and then choose the file. see http://www.altairuniversity.com/support-forum/?mingleforumaction=viewtopic&t=264
Once the STL file has been imported you can then use Geom > surfaces from FE and select the highest complexity in this panel > select the elements to create surfaces from STL, hence you can create geometry from stl.
To directly solid mesh your STL use ShrinkWrap
You can achieve a good tetramesh for all purposes, using the Shrink Wrap panel. The shrink wrap can generally be used as a quick mechanism to generate solid meshes.
1. Go to 2D > Shrink Wrap panel.
2. Here there is an option generate solid mesh – this will produce an all-hexa or all-tetra mesh based on the selected elements or geometry.
3. Make sure the generate solid mesh checkbox is active
4. This will expose a tet collapse input, please try several input values depending on your quality requirements.
See http://www.altairuniversity.com/support-forum/?mingleforumaction=viewtopic&t=448
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