Filament GlTF Loader aar Size

[Mehequanna]

In my project, I was moving from Sceneform to Sceneform Maintained. This moved my Filament version from 1.9.8 to 1.21.1.

After checking the APK size, I noticed it was noticeably higher. The biggest change was lib/libgltfio-jin.so. It's about 5 mb larger. I've tracked this down to Filament GlTF Loader that went from 2.8mb to 8mb between Filament versions 1.9.8 to 1.21.1. It's a large enough increase that there is discussion about how to make the APK smaller.

Is there a way to lower the size of libgltfio-jin.so while using Filament with Sceneform Maintained? Is there a lite version that would work with AR?

[romainguy]

This size increase unfortunately came from supporting more glTF features. There is a lite version of gltfio though: https://search.maven.org/artifact/com.google.android.filament/gltfio-android-lite/1.23.1/jar?eh=

It supports fewer glTF extensions, but the JNI is "only" 3 MiB.

[Mehequanna]

@romainguy thanks for the info. I'll give that a try. I just searched for some documentation on what the lite version supports and didn't find anything. Is there documentation on what the lite version does or doesn't support in comparison to the full gltfio?

[romainguy]

I would have to dig through our archives. We don't provide gltfio-lite anymore unfortunately, as it became increasingly difficult to support the ever expanding glTF spec this way :/

[Mehequanna]

Thanks for the info! That makes sense. I can dig through some old commits. But it's likely we'd choose not to add something not in active development.

[romainguy]

Note that gltfio-lite has the same implementation (mostly, the difference was in the shaders it implements) and APIs as full gltfio.