I want to export vertices (no mesh exists) as ply file. However, after exporting the data by File->Export->.ply, the generated ply file contains no vertices. Can anyone help? I'm using blender 2.8.
Thanks in advance.
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Your assessment is accurate, Blender's ply exporter loops over the triangles. This can be seen in line 90 of export_ply.py.
for i, f in enumerate(mesh.loop_triangles):
Any vertex that is not part of a face isn't included in the exported mesh in Blender 2.8.