CompareAlmostEqual(float x, float y, float epsilon)

public static bool CompareAlmostEqual(float x, float y, float epsilon) {
    // Based upon implementation:
    // http://floating-point-gui.de/errors/comparison/

    if (x == y)
        return true;

    float absX = Math.Abs(x);
    float absY = Math.Abs(y);
    float diff = Math.Abs(x - y);

    if (x * y == 0)
        return diff < (epsilon * epsilon);
    else
        return diff / (absX + absY) < epsilon;
}