C3T File

What are C3T files and how to open them

Are you having problems opening a C3T file or are you simply curious about its contents? We're here to explain the properties of these files and provide you with software that can open or handle your C3T files.

What is a C3T file?

A .C3T file is a Cocos2d-x 3D Object file.

Cocos2d-x 3D Object files are text-based scene bundles used by the Cocos2d-x game engine to describe 3D model geometry, materials, skeletons, and animations. They are produced by the engine's conversion tool when converting from formats like FBX, and are used alongside their binary counterparts for debugging or version control.

These files are created by the fbx-conv utility provided with Cocos2d-x. fbx-conv reads source model files (usually in FBX format), including any skeletal animation data, then exports them either in binary form (.c3b) for runtime efficiency or as human-readable text bundles (.c3t) for inspection or controls in version systems. During application execution, the engine loads the bundle and extracts mesh data, materials, skinning, and animation so that the 3D scene can be rendered or animated.

Text format bundles begin with JSON syntax, with typical keys such as VERSION, NODES, MESHES, MATERIALS, ANIMATIONS, SKELETON, ATTRIBUTES, and TRANSFORM. Other keywords like VERTICES, INDICES, TRIANGLES, AMBIENT, DIFFUSE, SPECULAR, EMISSIVE, SHININESS and UVMAPPING also appear. The file often starts with a header string like {"version": indicating JSON format.

How to open C3T files

Important: Different programs may use files with the C3T file extension for different purposes, so unless you are sure which format your C3T file is, you may need to try a few different programs.

We have not yet verified any programs for Windows that work with this specific file format. If you know one, please use the 'Suggest a program' link below. Thanks!

Last updated: August 25, 2026

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