Can I convert gltf/glb to obj or dae?

[Chris Wang]

Hi everyone 

There are many tools for converting obj and dae models to gltf/glb. 

But I can't find any tool that convert gltf/glb to obj or dae.

Are there any solution?

Thanks

Chris

[Sean Lilley]

You can try assimp, but the glTF support is still "partial"

[Chris Wang]

Hi Sean

I try to convert b3dm -> glb -> gltf -> obj.

But I met problem when converting glb to gltf using gltf-pipeline.

ERROR:

Unhandled rejection RangeError: start offset of Float32Array should be a multiple of 4

    at new Float32Array (native)

    at Object.ComponentDatatype.createArrayBufferView (F:\gltf-pipeline\node_modules\cesium\Source\Core\ComponentDatatype.js:296:20)

    at findAccessorMinMax (F:\gltf-pipeline\lib\findAccessorMinMax.js:44:52)

    at mapGeometryAttributeToPrimitive (F:\gltf-pipeline\lib\cesiumGeometryToGltfPrimitive.js:81:18)

    at cesiumGeometryToGltfPrimitive (F:\gltf-pipeline\lib\cesiumGeometryToGltfPrimitive.js:93:13)

    at optimizeForVertexCache (F:\gltf-pipeline\lib\optimizeForVertexCache.js:94:21)

    at Function.Pipeline.processJSONWithExtras (F:\gltf-pipeline\lib\Pipeline.js:134:9)

    at F:\gltf-pipeline\lib\Pipeline.js:264:29

    at tryCatcher (F:\gltf-pipeline\node_modules\bluebird\js\release\util.js:16:23)

    at Promise._settlePromiseFromHandler (F:\gltf-pipeline\node_modules\bluebird\js\release\promise.js:512:31)

    at Promise._settlePromise (F:\gltf-pipeline\node_modules\bluebird\js\release\promise.js:569:18)

    at Promise._settlePromise0 (F:\gltf-pipeline\node_modules\bluebird\js\release\promise.js:614:10)

    at Promise._settlePromises (F:\gltf-pipeline\node_modules\bluebird\js\release\promise.js:693:18)

    at Promise._fulfill (F:\gltf-pipeline\node_modules\bluebird\js\release\promise.js:638:18)

    at Promise._resolveCallback (F:\gltf-pipeline\node_modules\bluebird\js\release\promise.js:432:57)

    at Promise._settlePromiseFromHandler (F:\gltf-pipeline\node_modules\bluebird\js\release\promise.js:524:17)

And here is my glb file.

Any help appreciated

Thanks

Chris

在 2017年6月28日星期三 UTC+8下午10:35:44，Sean Lilley写道：

[Sean Lilley]

I haven't identified the cause of the bug, but if you use the -p flag while converting it will bypass the optimization stages, one of which is causing this error.

[gun...@jauntvr.com]

Sean is there any other tool that you are aware of which allows conversion from gltf to obj or fbx ?

[Sean Lilley]

You can try out assimp: https://github.com/assimp/assimp.

[griffingi...@gmail.com]

how? I can't find an exe or any explanation for the 80+ files

[starbucks...@gmail.com]

I found the download page.
https://github.com/assimp/assimp/releases/tag/v4.1.0/

[hrvoje...@gmail.com]

I use combinaton of Autodesk FBX Converter x64 2013 and http://52.4.31.236/convertmodel.html (obj2gltf). You can try on Windows 10, 3d Builder, open gltf file and then save to obj.

[cmcpro...@gmail.com]

It's 2019 now, so far I have had my best results using Blender using the GLTF addon by ksons:

https://github.com/ksons/gltf-blender-importer