Adding multiple gltf models

[siddhartpai]

Hi @bwasty I was trying to add an extra default gltf model in the scene, so that i could add reflections for the loaded object rather than a solid color.
Is it possible to somehow add an object to the scene as we do in three.js ?

[bwasty]

I was thinking about how to add/remove objects after initial loading or loading multiple gltf models at the same time a while ago, but didn't come up with a definitive design yet. So far the scene is immutable after loading, so this might require a fair bit of refactoring.

On second thought - since you want reflections, this could also be done with an environment map and the full IBL (Image based lighting) PBR. IBL is already in the shader (since it's based on the reference implementation), but currently unused.

[siddhartpai]

I meant shadows rather than reflections, and i don't need to edit the scene after loading , I'd rather add a custom object inside the scene before loading .

[bwasty]

As a general feature, I could imagine giving several files as the FILE parameter and then having several roots/scenes in the GltfViewer struct (I thought about getting rid of scene and putting everything in to root -> src). The render loop would then simply iterate the roots and call draw on them.

The first file passed would be the "main" file, because the parameters --cam-index and --scene can't easily refer to multiple files.

Shadows are a topic for themselves - I thought about implementing some standard shadow mapping technique, but only completing glTF support (a large chunk that's still missing is animations -> #3) and IBL.