How to read vertex position, color, normal and other informations in a GLTF file?

[Tetane]

In the raytracing example there is a line of code to read a scene.

auto loaded_scene = vsg::read_cast<vsg::Node>(filename, options);

If I use it to open a GLTF file, how can I get information like the vertices position, the color, the normal from the loaded_scene?