pub fn contribution_at(
problem: &InterferenceProblem,
source: &Emitter,
at: Point3M,
) -> Result<(f64, f64), InterferenceError>Expand description
Evaluates one emitter’s complex field contribution at one point.
The tuple is (real, imaginary). This is the dependency-free f64
executable specification for a single source, not a grid solver or an
accumulation policy.