shmodot/scripts/orbits/math/IEllipseExtensions.cs

using Vim.Math3d;
using System;

public static class IEllipseExtensions
{
    public static DVector2 GetPosition(this IEllipse e, double t) =>
        new DVector2(Math.Cos(t) * e.a, Math.Sin(t) * e.b);
}