You can try checking this answer How to export 3D spheres (3D plot) generated in Matlab to ANSYS or Abaqus. ? - (mathworks.com) This provides a workaround to export the MATLAB meshes into stl files.
How to export a 3d surface to Ansys apdl?
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I want to export a complex geomtery from matlab to ansys apdl for meshing. For example how can i import the sphere shown below to ansys for further processing. The geometry is very complex, i am using shpere only for illutration purpose. 
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