Hello,

I am working on a 3d model and I wish to calculate the flux through a
rectangular surface with normal not parallel to either X, Y, or Z. I refer
to the online tutorial, which gives the following flux-region definition:

direction [direction constant]

The definition of direction is a constant, but I am not sure how to do this
without vector3. I wish to calculate the flux in the direction of
-cos(delta)*X-sin(delta)*Y, where X and Y are the original coordination axes
and delta is the rotation angle.

Could you please give me some hint in setting the direction? Thank you!


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