GEO Flag: Use Geometric Paths
Ignore refraction effects when ray-tracing
Allow for refraction
sets the refractive index (calculated in
) to unity, although in practice there are switches in the ray-tracing code for the non-refractive case.
Incompatible with viewing geometries that don't involve a spherical atmosphere (since these have no refraction effects)
This Flag should not be confused with the
alternative to the
section which specifies tangent paths by their
geometric tangent points, but for which refraction is still considered.
[no recent bugs]
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