Vector3Converter

  public class Vector3Converter : JsonConverter
    {
        public override void WriteJson(JsonWriter writer, object value, JsonSerializer serializer)
        {
            var vector = (Vector3)value;
            writer.WriteStartArray();
            writer.WriteValue(vector.x);
            writer.WriteValue(vector.y);
            writer.WriteValue(vector.z);
            writer.WriteEndArray();
        }

        public override object ReadJson(JsonReader reader, Type objectType, object existingValue, JsonSerializer serializer)
        {
            var val= new Vector3(reader.ReadAsFloat(), reader.ReadAsFloat(), reader.ReadAsFloat());
            while(reader.TokenType != JsonToken.EndArray)
                reader.Read();
            return val;
        }

        public override bool CanConvert(Type objectType) => objectType == typeof(Vector3);
    }

    public class QuaternionConverter : JsonConverter
    {
        public override void WriteJson(JsonWriter writer, object value, JsonSerializer serializer)
        {
            var vector = (Quaternion)value;
            writer.WriteStartArray();
            writer.WriteValue(vector.x);
            writer.WriteValue(vector.y);
            writer.WriteValue(vector.z);
            writer.WriteValue(vector.w);
            writer.WriteEndArray();
        }

        public override object ReadJson(JsonReader reader, Type objectType, object existingValue, JsonSerializer serializer)
        {
            var val= new Quaternion(reader.ReadAsFloat(), reader.ReadAsFloat(), reader.ReadAsFloat(),reader.ReadAsFloat());
            while(reader.TokenType != JsonToken.EndArray)
                reader.Read();
            return val;
        }

        public override bool CanConvert(Type objectType) => objectType == typeof(Quaternion);
    }


    public static class JsonExtensions
    {
        public static float ReadAsFloat(this JsonReader reader) => (float)(reader.ReadAsDecimal()).GetValueOrDefault();
    }