The sample models should all have a scene property

[javagl]

As reported in KhronosGroup/glTF#1326 , some of the models (particularly the hand-crafted Simple... models) may not have a scene property. According to the 2.0 spec, this means that nothing has to be rendered at all. (This was not yet entirely clear in 1.0).

The corresponding samples should be reviewed and updated accordingly.

[emackey]

We should probably also have a sample that has multiple scenes, to test what that does in various engines.

[javagl]

Agreed. There had been some trouble with some glTF 1.0 viewers when there was no default scene (crashes and bugs). But I think that even more viewers (1.0 and 2.0) would bail out when there are multiple scenes. I'll try to create such a model as well, that could show some interesting effects ;-)

[javagl]

Closed via #242 .

The point of having multiple scenes in one asset is currently discussed in KhronosGroup/glTF#1542 (shortly before I was pointed to that issue, I created a simple MultipleScenes example that currently only is in a branch at https://github.com/javagl/glTF-Sample-Models/tree/MultipleScenes )