ParseVector3.cs

static public Vector3 ParseVector3(string input) {
    input = input.TrimStart('(').TrimEnd(')')
    string[] components = input.Split(',');

    Vector3 output = Vector3.zero;
    if (components.Length > 0) {
        try { output.x = float.Parse(components[0]); } catch (Exception e) {}
    }
    if (components.Length > 1) {
        try { output.y = float.Parse(components[1]); } catch (Exception e) {}
    }
    if (components.Length > 2) {
        try { output.z = float.Parse(components[2]); } catch (Exception e) {}
    }
    
    return output;
}