MaterialId is always -1 even if the textures are present

[daker]

Hi,

Thank you for putting the effort on the library, i am using the wasm version and facing an issue where for some models provided by Apple, the MaterialId is always -1 which result in no texture displayed.

Do you have an idea what causes the issue ?

https://developer.apple.com/augmented-reality/quick-look/models/stratocaster/fender_stratocaster.usdz
https://developer.apple.com/augmented-reality/quick-look/models/drummertoy/toy_drummer_idle.usdz
https://developer.apple.com/augmented-reality/quick-look/models/biplane/toy_biplane_idle.usdz
https://developer.apple.com/augmented-reality/quick-look/models/vintagerobot2k/robot_walk_idle.usdz

[syoyo]

You should post reproducible code.

[daker]

i did left a reproduction code

#205 (comment)

[daker]

Here is a simple reproduction code with the model, both meshes from the .usdz have materials but the code return -1

tinyusdz-bug.zip

[syoyo]

You can try adding 'converter.GetWarning()' and how it goes. It shows warning message during scene conversion

tinyusdz/web/binding.cc

Line 103 in db4e6aa

loaded_ = converter.ConvertToRenderScene(env, &render_scene_);

[daker]

Unfortunately i get no warnings, any other ideas to debug this issue ?

loaded_ = converter.ConvertToRenderScene(env, &render_scene_);
warn_ = converter.GetWarning();

const std::string warn() const { return warn_; }

 .function("warn", &TinyUSDZLoader::warn)

[syoyo]

You can debug the C++ part of TinyUSDZ by:

• add printf to suspicious place
• enable TINYUSDZ_DEBUG_PRINT

  tinyusdz/CMakeLists.txt

  Line 172 in 1b3b08f

  TINYUSDZ_DEBUG_PRINT