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Refraction Boundary
If an incident and exit ray is given, then the RefractBoundary command
can calculate the boundary curve that will result in that refraction.
The tangent line will be created on the current layer and remain selected.
Options:
Direction: N1N2 / N2N1.
Note:
The order of selection has to correspond. Valid ray curves are: on XY-plane
(World Z=0), linear curves (lines and polylines)
If the calculated boundary curve would cause an internal reflection, then
nothing will be created.
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