Update samples to gltf2.0 specification

[jtorresfabra]

We are trying to integrate 3D tiles in http://osgjs.org. Unfortunately we can't support all versions of glTF so it would be nice if the samples can be upgraded to glTF 2.0. Thanks!

[lilleyse]

Yes definitely, the 3D Tiles spec will ultimately be written against gltf 2.0. These samples should be updated relatively soon.

[pjcozzi]

@jtorresfabra in the meantime, there is a glTF 1.0 to 2.0 stage here: CesiumGS/gltf-pipeline#191

Also, see CesiumGS/3d-tiles#94

[jtorresfabra]

Hi @lilleyse @pjcozzi Any news on this?

[lilleyse]

Sorry, no update yet. Since glTF 2.0 is now stabilized in Cesium we should be able to safely work on this.

[jtorresfabra]

Thanks, I will wait for it :).

[PrincessGod]

Hi, @lilleyse.
I am using Cesium, and I want to convert my models to b3dm, but the spec using batchId with glTF 1.0,
so I am wondering if it possible to update both the 3d-tiles spec and Cesium support glTF 2.0 ?
thanks.

[lilleyse]

You can start to write b3dm tiles with glTF 2.0 already. Just ignore the notes in the spec for now that are relevant to glTF 1.0. As long as the glTF primitive has a _BATCHID vertex attribute, it should work.

Check out https://github.com/AnalyticalGraphicsInc/cesium/tree/master/Specs/Data/Cesium3DTiles/Batched/BatchedWithKHRMaterialsCommon. While that tileset is not glTF 2.0, the idea is similar because that tile does not have shaders/techniques built-in.

We plan on updating the spec soon.

[PrincessGod]

@lilleyse Thank you very mach! It is really helpful.

[PrincessGod]

@lilleyse Sorry to bother you again.

I have a standard glTF 2.0 model with _BATCHID now, but how can I convert to .glb? Cause I need convert it to .b3dm now. Seems like the gltf-pipeline only used to glTF 1.0 . Thanks.

[lilleyse]

Keep an eye on the 2.0 branch in gltf-pipeline. The code is all there for converting glTF to glb but the CLI is not yet ready. I hope to update that soon and will get back to you when it's ready.

https://github.com/AnalyticalGraphicsInc/gltf-pipeline/tree/2.0

[PrincessGod]

@lilleyse Actually I found your obj2gltf, and my job is finished based on that, because it is glTF 2.0.
When I got .glb with _BATCHID build in, the 3d-tiles formats all work out now!

Thakns again, wishing you and Cesium having a great success.

[jucamal]

Hello, do you update the sample models to gltf 2.0??
I have been tried to convert using [https://github.com/AnalyticalGraphicsInc/3d-tiles-tools] but the model still on gltf 1.0.
I tested with TilesetWithDiscreteLOD

[lilleyse]

Sorry, the sample models have not been updated yet.