DDS-Unsplitter

A utility for combining split DDS (DirectDraw Surface) texture files, specifically designed for handling CryEngine texture formats.

Overview

DDS-Unsplitter combines split DDS texture files back into their original form. It's particularly useful for working with CryEngine textures where a single texture might be split into multiple files (a header file and several mipmap files), including DDS cubemaps.

For DDNA files with the gloss channel in the alpha layer, the unsplitter will take the texture and create 2 separate textures: one with the normal map and a second with the gloss details. The gloss texture will have _gloss appended to the file name, prior to the extension. For example, if you convert the file texture_ddna.dds, you will end up with a texture_ddna.dds file with the normal data and a texture_ddna_gloss.dds file.

Features

• Combines split DDS files into a single file
• Handles both standard DDS and DXT10 formats
• Preserves CryEngine-specific formatting
• Option for safe file handling (prevents overwriting originals)
• Properly handles DDS cubemaps and signed distance fields (SDF) files
• Converts DDNA (split normal and gloss textures) into a pair of files

Installation

Option 1: NuGet Package (Library)

Install the library in your .NET project:

dotnet add package DDSUnsplitter

Option 2: Download Release (Executable)

1. Go to the Releases page
2. Download the latest release's executable
3. Place it wherever you want to use it (no installation required).
4. Add the executable to your system PATH for easy access.

Option 3: Build from Source

1. Clone the repository
2. Open the solution in Visual Studio
3. Build the solution
4. Find the executable in the bin directory

Usage

Command Line Tool

Basic usage:

DDS-Unsplitter.exe <filename> [options]

Parameters

• filename: The base name of the split DDS files to combine. Can be:
  • Full path: D:\depot\textures\file.dds
  • Relative path: .\file.dds
  • Just filename: file.dds (will use current directory)
  • Extension is optional

Options

• -s, --safe: Prevents overwriting original files by adding ‘.combined’ before the extension

Examples

# Basic usage
DDS-Unsplitter.exe texture.dds

# Use safe mode
DDS-Unsplitter.exe texture.dds --safe

# Without extension
DDS-Unsplitter.exe texture -s

# With full path
DDS-Unsplitter.exe C:\game\textures\texture.dds

Library Usage

When using the NuGet package in your .NET projects:

using DDSUnsplitter.Library;

// Combine split DDS files
string combinedFilePath = DDSUnsplitter.Combine("path/to/texture.dds");

// Use safe mode to prevent overwriting originals
string safeCombinedPath = DDSUnsplitter.Combine("path/to/texture.dds", useSafeName: true);

// Custom identifier for safe mode
string customCombinedPath = DDSUnsplitter.Combine(
    "path/to/texture.dds", 
    useSafeName: true, 
    combinedFileNameIdentifier: "merged"
);

API Reference

• DDSUnsplitter.Combine(string baseFileName, bool useSafeName = false, string combinedFileNameIdentifier = "combined"): Main method to combine split DDS files

Notes

• Split files should be in the same directory
• Files should be numbered sequentially (.0, .1, .2, etc.)
• By default, it will overwrite the .dds file with the combined version and save the original file with a .0 extension
• If a file has already been combined, it will be skipped

File Format Support

The utility handles several DDS format variants:

• Standard DDS files
• DXT10 format files
• ATI2/BC5 normal maps

Contributing

Interested in contributing? Please read our Contributing Guidelines.

License

This project is licensed under the MIT License - see the LICENSE file for details.

Acknowledgments

• Thanks to the DDS file format documentation from Microsoft
• Thanks to the CryEngine community for format information