STL file transformation

[purin]

I imported a .stl file (ASCII format) into CloudCompare, which originally had 1,204,344 faces. Upon performing rotation and translation, the new .stl file (ASCII format) consists of faces. I experienced the same problem when trying with Binary format .stl files. Is there a reason why this is so?

[daniel]

I guess the final number of faces is smaller than the original one? (it's missing in your message).

This may be the case if some faces are very very thin or small (e.g. at least one edge length is below 1.e-6). In which case the face is discarded and the near vertices are merged.