Bear glTF 2.0 model is not displayed in Cesium.js v1.40 or later

[cx20]

I tried to display the bear glTF model that was in sketchfab with the latest version of Cesium.js.
https://sketchfab.com/models/f2f13a8630004b1c82730d8b9ffa0e1f

However, in Cesium.js v1.40 and later, an error is displayed and it seems that it is not displayed correctly.

Cesium.js v1.39 + Bear glTF model result:

Cesium.js v1.44 + Bear glTF model result:

Cesium.js:532 
An error occurred while rendering.  Rendering has stopped.
undefined
TypeError: i.clampTime is not a function
TypeError: i.clampTime is not a function
    at Array.<anonymous> (https://cdn.rawgit.com/cx20/gltf-test/279cba56/libs/cesium/1.44/Cesium.js:497:22244)
    at h (https://cdn.rawgit.com/cx20/gltf-test/279cba56/libs/cesium/1.44/Cesium.js:496:19348)
    at c.update (https://cdn.rawgit.com/cx20/gltf-test/279cba56/libs/cesium/1.44/Cesium.js:496:21384)
    at Ae.update (https://cdn.rawgit.com/cx20/gltf-test/279cba56/libs/cesium/1.44/Cesium.js:498:20408)
    at a.update (https://cdn.rawgit.com/cx20/gltf-test/279cba56/libs/cesium/1.44/Cesium.js:492:8011)
    at tt (https://cdn.rawgit.com/cx20/gltf-test/279cba56/libs/cesium/1.44/Cesium.js:525:21935)
    at Ke (https://cdn.rawgit.com/cx20/gltf-test/279cba56/libs/cesium/1.44/Cesium.js:525:19739)
    at Qe (https://cdn.rawgit.com/cx20/gltf-test/279cba56/libs/cesium/1.44/Cesium.js:525:17745)
    at lt (https://cdn.rawgit.com/cx20/gltf-test/279cba56/libs/cesium/1.44/Cesium.js:525:25765)
    at ut (https://cdn.rawgit.com/cx20/gltf-test/279cba56/libs/cesium/1.44/Cesium.js:525:25933)

[lilleyse]

I opened a fix in #6422

[cx20]

Although it may be another problem, in Cesium.js v1.42 or later, it seems that animation-enabled models are not animated. BoxAnimated, CesiumMan, Monster, etc..

[emackey]

@cx20 There was a change there, add shouldAnimate: true to the Cesium.Viewer constructor options. The default behavior starts in pause now.

[cx20]

@emackey Thank you for telling me that the options have changed. I modified the sample and confirmed that the above model was animated.

[cx20]

I noticed that the following glTF model can not be displayed. I will report this as a separate Issue.

https://cdn.rawgit.com/mrdoob/rome-gltf/784089b4/files/models/life_soup/quadruped_fox.gltf
https://cdn.rawgit.com/pissang/claygl/c4f45119/example/assets/models/SambaDancing/SambaDancing.gltf

[pjcozzi]

@cx20 @emackey thanks for reporting all these glTF issues! OK to close this one?

[emackey]

@pjcozzi The related PR #6422 didn't get merged yet. @lilleyse is it being held up by the lack of a test model?

[emackey]

This auto-closed because I merged the animation fix. I think I'm still seeing an issue where the bear renders inside-out when viewed from the back. Not sure what that's about...