Blender addon that adds KTX2 texture support to glTF export/import.

• KTX2 Texture Export: Converts textures to KTX2 format with multiple compression options
• KTX2 Texture Import: Decodes KTX2 textures back to standard formats for Blender
• Environment Map Export: Exports world environment as KTX2 cubemap (KHR_environment_map extension)
• Environment Map Import: Imports KTX2 cubemaps and sets up world environment

Transcodes to any GPU format at runtime (BC7, ASTC, ETC2, etc.). Best compatibility across all platforms.

Native ASTC format that uploads directly to GPU without any transcoding.

Supported hardware:

• Modern Android devices
• Apple Silicon (M1/M2/M3/M4 Macs, all iPhones/iPads)
• Some desktop GPUs with ASTC support

Note: Use Basis Universal for maximum compatibility. Use Native ASTC when targeting ASTC-capable hardware for zero transcoding overhead.

• GLB (binary)
• glTF Embedded
• glTF Separate (with external .ktx2 files)

• Blender 4.0+
• KTX-Software tools (downloaded automatically on first use, can take few minutes ~7MB)

1. Download the latest gltf_ktx2_extension.zip
2. In Blender: Edit > Preferences > Add-ons > Install
3. Select the addon folder or zip file
4. Enable "glTF KTX2 Texture Extension"

The extension adds options to the glTF export/import panels:

Export:

• Enable "KTX2 Textures" to convert textures to KTX2
• Choose target format:
  • Basis Universal: Universal compatibility, transcodes to any GPU format at runtime (ETC1S or UASTC mode)
  • Native ASTC: Direct GPU upload on ASTC hardware, no transcoding (configurable block size)
• Optionally generate mipmaps
• Optionally keep original texture as fallback
• Optionally export environment map as cubemap

Import:

• KTX2 textures are automatically decoded when importing glTF files

• KHR_texture_basisu - For KTX2 compressed textures
• KHR_environment_map - For environment cubemaps