Gltf-pipeline command line and scripts, giving errors in runtime

General
1

Hi,
I am using gltf-pipeline tool for converting my gltf file to draco compression and later to glb. I facing some difficulties while executing it.

I have done global installation of gltf-pipeline as per the README file this is the command I used
npm install -g gltf-pipeline

I am trying to use draco compression for the gltf file I have, the command is very similar to that of the README file
gltf-pipeline -i /path/building2gltf.gltf -o /path/building2gltfdrc.gltf -d

This is not working for me as the command is executed the error is popped up as follows:

Error
    at new RuntimeError (/usr/local/lib/node_modules/gltf-pipeline/node_modules/cesium/Build/CesiumUnminified/index.cjs:17013:11)
    at fileURLToPath (/usr/local/lib/node_modules/gltf-pipeline/lib/FileUrl.js:38:11)
    at readFile (/usr/local/lib/node_modules/gltf-pipeline/lib/readResources.js:148:24)
    at readResource (/usr/local/lib/node_modules/gltf-pipeline/lib/readResources.js:114:10)
    at readImage (/usr/local/lib/node_modules/gltf-pipeline/lib/readResources.js:73:10)
    at /usr/local/lib/node_modules/gltf-pipeline/lib/readResources.js:55:31
    at ForEach.object (/usr/local/lib/node_modules/gltf-pipeline/lib/ForEach.js:44:21)
    at ForEach.topLevel (/usr/local/lib/node_modules/gltf-pipeline/lib/ForEach.js:63:18)
    at ForEach.image (/usr/local/lib/node_modules/gltf-pipeline/lib/ForEach.js:202:18)
    at /usr/local/lib/node_modules/gltf-pipeline/lib/readResources.js:54:15
    at tryCatcher (/usr/local/lib/node_modules/gltf-pipeline/node_modules/bluebird/js/release/util.js:16:23)
    at Promise._settlePromiseFromHandler (/usr/local/lib/node_modules/gltf-pipeline/node_modules/bluebird/js/release/promise.js:547:31)
    at Promise._settlePromise (/usr/local/lib/node_modules/gltf-pipeline/node_modules/bluebird/js/release/promise.js:604:18)
    at Promise._settlePromise0 (/usr/local/lib/node_modules/gltf-pipeline/node_modules/bluebird/js/release/promise.js:649:10)
    at Promise._settlePromises (/usr/local/lib/node_modules/gltf-pipeline/node_modules/bluebird/js/release/promise.js:729:18)
    at Promise._fulfill (/usr/local/lib/node_modules/gltf-pipeline/node_modules/bluebird/js/release/promise.js:673:18) {
  message: 'Expected path.protocol to start with file:'
}

I even tried to use the pipeline as a library to run in nodejs environment. Still I face errors as the script is not very different from the README file

The script I am using is as follows:

const gltfPipeline = require("gltf-pipeline");
const fsExtra = require("fs-extra");
const processGltf = gltfPipeline.processGltf;
const gltf = fsExtra.readJsonSync("building2gltf.gltf");
const options = {
    dracoOptions: {
        compressionLevel: 10,
    },
};

exports.module = (gltf, options) => {
    processGltf(gltf, options).then(function (results) {
        fsExtra.writeJsonSync("buildingdraco.gltf", results.gltf);
    });
};

The error I am getting while executing this script is as follows:

Unhandled rejection Error
    at new RuntimeError (/node_modules/cesium/Build/CesiumUnminified/index.cjs:17013:11)
    at fileURLToPath (/node_modules/gltf-pipeline/lib/FileUrl.js:38:11)
    at readFile (/node_modules/gltf-pipeline/lib/readResources.js:148:24)
    at readResource (/node_modules/gltf-pipeline/lib/readResources.js:114:10)
    at readImage (/node_modules/gltf-pipeline/lib/readResources.js:73:10)
    at /home/yadunandan/node_modules/gltf-pipeline/lib/readResources.js:55:31
    at ForEach.object (/node_modules/gltf-pipeline/lib/ForEach.js:44:21)
    at ForEach.topLevel (/node_modules/gltf-pipeline/lib/ForEach.js:63:18)
    at ForEach.image (/node_modules/gltf-pipeline/lib/ForEach.js:202:18)
    at /node_modules/gltf-pipeline/lib/readResources.js:54:15
    at tryCatcher (/node_modules/bluebird/js/release/util.js:16:23)
    at Promise._settlePromiseFromHandler (/node_modules/bluebird/js/release/promise.js:547:31)
    at Promise._settlePromise (/node_modules/bluebird/js/release/promise.js:604:18)
    at Promise._settlePromise0 (/node_modules/bluebird/js/release/promise.js:649:10)
    at Promise._settlePromises (/node_modules/bluebird/js/release/promise.js:729:18)
    at Promise._fulfill (/node_modules/bluebird/js/release/promise.js:673:18)

May I know where I am going wrong and how to make use of this library.

2

When you are using exactly
gltf-pipeline -i /path/building2gltf.gltf -o /path/building2gltfdrc.gltf -d
then the leading slashes / are probably wrong, and this might cause the error message.

When the absolute path of the input file is something like
C:\Models\path\building2gltf.gltf
and you are in the C:\Models directory, then the command line would be

gltf-pipeline -i ./path/building2gltf.gltf -o ./path/building2gltfdrc.gltf -d

                 ^ dot here and               ^ dot here

to make sure that the paths refer to the directory in which you currently are.

(You should also be able to give absolute paths for the input and output, maybe that would be clearer)

3

Hello, thanks for replying,

I am using this library on a linux machine (Ubuntu). Hence when I say ‘/path’ I meant /home/user/Documents/building2gltf.gltf.

I have made sure that I had given the absolute path.

I have also tried to traverse to the directory where the input files are present and used ‘.’ to refer to the current directory. I am still facing the same error.

4

I found Expected path.protocol to start with file: · Issue #497 · CesiumGS/gltf-pipeline · GitHub which seems like the same error message. Would it be possible to share the glTF file (in doubt, as a ZIP in a private message), or have a look at the file to see whether it contains any suspicious images references?

5

I did use the Khronos gltf validator on web. I was able to find out that my file had some errors. I tried with a different file and I was able to compress and do other operations using the library.