Free online AC to DAE converter

A game engine, CAD viewer, animation package, or asset archive may require COLLADA instead of AC3D’s native format. Converting the model to DAE makes its scene data available to software that does not read AC files.

What the AC format is

AC is the native text-based 3D model format used by AC3D, a polygon-modeling application. An .ac file can describe vertices, polygon surfaces, object hierarchy, materials, texture coordinates, texture references, and other object properties.

AC files occur in AC3D projects and in older game, aircraft, vehicle, simulation, and technical-visualization assets. The format is mainly intended for polygon geometry; it has limited support for advanced shaders, physically based materials, animation, and complex scene metadata.

What the DAE format is

DAE is the filename extension for COLLADA, an XML-based 3D interchange format. A COLLADA file can represent geometry, node hierarchies, transforms, cameras, lights, materials, texture references, skinning, and animation.

DAE is useful when the destination software supports COLLADA but cannot import AC3D. Its explicit scene structure can transfer more than a basic mesh format, although the XML file may be larger than a binary equivalent and textures are often stored as separate image files.

How to convert AC to DAE

Using AC3D

1. Open the .ac file in AC3D.
2. Inspect the model for missing textures, hidden objects, incorrect scale, reversed faces, and unwanted geometry.
3. Choose File → Export and select the COLLADA or DAE exporter if it is included in your AC3D version.
4. Enable the available options for UV coordinates, normals, texture paths, and object hierarchy. Save the result as model.dae.
5. Open the DAE file in the destination application and check its scale, axis orientation, hierarchy, materials, and texture paths.

Using Assimp

Assimp, the Open Asset Import Library, can convert files when the installed build includes both its AC3D importer and COLLADA exporter. From a terminal in the directory containing the model, run:

assimp export model.ac model.dae

Use complete input and output paths when the files are elsewhere. Inspect the generated DAE in a COLLADA-capable viewer or editor because command-line conversion may omit AC3D-specific properties that have no direct COLLADA equivalent.

Using 101convert.com

You can convert the file for free on 101convert.com without installing software: upload the AC file, select DAE as the output format, start the conversion, and download the result. Avoid uploading confidential or proprietary models to a web-based converter.

Quality and compatibility limits

• Basic colors, transparency, UV coordinates, and texture references usually transfer more reliably than custom shaders, renderer-specific settings, or advanced material graphs.
• Keep referenced texture images with the DAE file unless the destination software supports embedded textures. Relative paths make the model easier to move between systems.
• Verify units and coordinate conventions. Applications can disagree about scale and whether the scene is Y-up or Z-up, causing size or orientation changes.
• Inspect polygon winding, normals, and smoothing after conversion. Differences in these settings can create dark faces, reversed surfaces, or unexpected hard edges.
• Although COLLADA supports animation and skinning, a typical AC file contains static polygon geometry. Conversion cannot add animation absent from the source.