Difference *.rvt and IFC?

Hi,

I have downloaded 2D and 3D/Bim information from a supplier of roof tiles
I want to try to add individual rooftiles to my model.
If I compare the basic rooftile in de *.rvt (showcase)file and the IFC-file there is a difference in the smoothness of the surface. In het .rvt-file the surface is much smoother (less lines on the surface).




Questions:
- Both are 3D-solids. Is one beter than the other?
- I think I prefer the .rvt-file because of the smoother appearance, but I am not able to copy the 3D-solid out of
the rvt-file to another drawing.
How would I be able to copy/export the 3D-solid?


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