If you're not on https://git.kroner.dev/HKX2/hkx2library, then you're on a mirror.

HKX2Library

A standalone customized version of Katalash's HKX2 library for Havok packfile deserialization and serialization used in DSMapStudio.

Differences

• Supports Breath of the Wild packfiles used on Wii U and Switch (might support other games that use the same classes).
• Supports conversion of packfiles between those two platforms.
• Padding improvements which allow for perfectly matching Navmesh (.hknm2) files.

Known issues

• Ragdoll files (.hkrg) differ from vanilla files because of different fixup ordering. This issue shouldn't affect functionality.

Usage

git submodule add https://gitlab.com/HKX2/HKX2Library <your-repo-dir>/some/path/HKX2Library

Then reference it in your solution and project.

using HKX2;

namespace PlatformConverter
{
    internal static class Program
    {
        private static void Main(string[] args)
        {
            string inFile = args[0];
            string outFile = args[1];
            string outPlatform = args[2];

            HKXHeader header = outPlatform switch
            {
                "wiiu" => HKXHeader.BotwWiiu(),
                "nx" => HKXHeader.BotwNx(),
                _ => throw new ArgumentException("Invalid platform!")
            };

            using (FileStream rs = File.OpenRead(inFile))
            {
                var br = new BinaryReaderEx(rs);
                var des = new PackFileDeserializer();

                var root = (hkRootLevelContainer) des.Deserialize(br);

                using (FileStream ws = File.Create(outFile))
                {
                    var bw = new BinaryWriterEx(ws);
                    var s = new PackFileSerializer();

                    s.Serialize(root, bw, header);
                }
            }
        }
    }
}

Technical details

• ./HKX2/Autogen/ contains Havok classes generated from Breath of the Wild reflection information dump.
• ./HKX2/Manual/ also contains generated classes, but edited to the best of my patience and capabilities to match both Wii U and Switch files.
• Differences in class structure between games and platforms is dependent on Havok version used and platform's header information (pointer size, endian, padding option).

Credits

• katalash - The original HKX2 library included in DSMapStudio
• JKAnderson - BinaryReaderEx and BinaryWriterEx included in SoulsFormats