Vray and risks with system units conversion (from imperial to metric)

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  10 October 2012
Vray and risks with system units conversion (from imperial to metric)

Are there any risks when you open a file that was previously saved with imperial system units and then you convert to metric system units?

What I can see is that objects get converted - so far you understand what happens.
But are there other values that are converted?
Or maybe even _not_ converted that might cause problems because they were set for an imperial world units? I am specifically thinking of render settings values that worked fine previously and might not match anymore because of the inch > cm conversion.
  10 October 2012
If you're talking about SYSTEM UNITS (not display units) then it's generally advised to not mess up with them. You see, lots of things go under the hood of a render engine (or simulations engines) that are very sensitive to the units definition, so it's better to leave the unit system in the same world where they were conceived.

If you're talking about display units then it's ok (?). The display is only used to change the units of spinners and viewport. Internally everything is still being calculated in inches.
  10 October 2012
I was referring to system units.

But what should I do if I have one scene that is imperial and another that is metric and I want to join them.
So if my vray scene was made in imperial settings, should I convert the objects that were made in metric to imperial and stick to the latter one?
Or is there any way to convert the system units _of the render_?
  10 October 2012
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