Use libgltfio_resources_lite.a library to crash in hello-gltf

[wangruibobobo]

Describe the bug

To Reproduce

Because libgltfio_resources.a took up too much space,
-DGLTFIO_LITE=1 was used at compile time, and libgltfio_resources_lite.a was chosen instead

Expected behavior
A crash occurs while hello-gltf is running

**in const SamplerInterfaceBlock::SamplerInfo filament::SamplerInterfaceBlock::getSamplerInfo(const char ) const:110
reason: sampler named "clearCoatMap" not found

Screenshots

Desktop (please complete the following information):

• OS: iOS14
• Backend: Matal

Smartphone (please complete the following information):

• Device: iphoneX
• OS: iOS14

[romainguy]

How exactly did you use -DGLTFIO_LITE? Did you compile the gltfio library yourself? That flag is not meant to be used to compile your app.

[wangruibobobo]

In fact, I modified the libs/gltfio/CMakeList.text file.

CMakeLists.txt

And UbershaderLoader.cpp file.

Or how can I use it correctly libgltfio_resources_lite.a

Thanks.

[romainguy]

This define is needed in more places than just UbershaderLoader.cpp. You should pass it as a flag to the compiler.

[wangruibobobo]

With these two lines of code currently compiled, how do I add flags

sudo ./build.sh -p desktop -i release
sudo ./build.sh -p ios -i release

[romainguy]

You need to modify build.sh to add -DGLTFIO_LITE=1 to the invocation of CMake in the function build_ios_target.

[wangruibobobo]

I removed all the previous changes and added -DGLTFIO_LITE=1，
Run

sudo ./build.sh -p desktop -i release
sudo ./build.sh -p ios -i release

and change Other Linker Flags
Did I add it in the wrong place

[romainguy]

@wangruibobobo The problem you are running into is that gltfio-lite does not support clear coat. gltfio-lite only supports a subset of glTF extensions. If you want to support clear coat you will need to use the full version of gltfio. As for your linker error, you probably need to do a clean build for the flag to take effect (but like I just mentioned this won't fix your original issue with clear coat).

[wangruibobobo]

Thank you for your quick reply. I would like to know if there is a material that is not supported by the Lite Library, will crash be caused? Will this material be ignored

[prideout]

In debug builds, we assert if a sampler is set that does not exist, which can occur when attempting to load a model that uses an extension that is not supported by the ubershader. The intention is to not crash in release builds.