G3DB output

[dancovich]

G3DB output

[Dancovich]

I'm not too familiar with the G3DB format. Looking at the format specification it seems that it's just the G3DJ file with no line breaks and written as a byte array but I can be wrong.

Anyway I found out there's a UBJsonWriter class in LibGDX nightly so I'll try to use that to write a converter in Java that will batch convert G3DJ files in a folder.

Thanks for trying my converter and for the suggestion.

[VinceAngel]

Maybe we could ask Xoppa to have more detailed explanations on the binary format.

[Dancovich]

That was quick.

https://github.com/Dancovich/libgdx_g3db_converter

As I imagined the G3DB format is just a JSON format output as a byte stream. There are certain details about the binary format like how many bytes to use for long, char, etc.

So I just used the provided UBJsonWriter. It really can output any JSON file to binary format, not just G3D models, and it already takes care of binary format issues.

Did some preliminary tests with a default model and it loaded without issues. Just remember to instantiate your model loader with G3dModelLoader loader = new G3dModelLoader(new UBJsonReader()). Notice the use of UBJsonReader instead of JsonReader, it's necessary or else your model won't load.

I'm closing this issue for now. Please, if you can, do some testing and post any issues you find in the converter repository.

[VinceAngel]

Nice ! thanks.
I'll have a look ASAP

[VinceAngel]

Just to be sure to understand : with the UBJsonWriter I can write a g3db file from a g3dj file red using G3dModelLoader loader = new G3dModelLoader(new UBJsonReader()) ?
Would it be hard to write it from the exporter plugin (I don't know python, or not yet ^^ ) to avoid having to use some code for writing the binary file ?

[Dancovich]

Just use the code on the link I provided.

https://github.com/Dancovich/libgdx_g3db_converter

This code will read a folder and output any g3dj files it finds into a g3db file. The README.md contains usage instructions. You can call it from the command line, no need to embed it into your code.

This code depends on the main GDX library. If you use Maven the provided pom.xml is already configured to depend on it.

[VinceAngel]

Ho I see :-)
Thanks a lot for this fast work you did !