Hi everyone, We recently overhauled the model code and will no longer officially support glTF 1.0 in CesiumJS 1.97 and above. glTF 1.0 support was deprecated in CesiumJS 1.94. Since this is a large change I wanted to reach out to the community to see if anyone is using glTF 1.0 and provide suggesti…

This just came to my attention. GeoFS is using almost exclusively GLTF 1 models and relies on custom shaders precisely “for lighting and billboard effects” and other tricks. There is also a large library of user contributed models that are mostly in the GLTF 1 format. I will investigate the possibil…

@Xavier_Tassin Thanks for the feedback. Definitely give custom shaders a try. I’m sure @ptrgags would be happy to help if there are specific effects you’re trying to achieve. The Custom Shader Guide is a good starting point. There are also a few sandcastles to explore.

Thanks @sean_lilley for the pointers. Can we expect KHR_technique_webgl extension to be implemented once ratified by the Khronos group?

I don’t expect KHR_techniques_webgl to be ratified since it was moved to an archived section. It would be difficult to support in the same way that glTF 1.0 is. glTF/extensions/2.0/Archived at main · KhronosGroup/glTF main/extensions/2.0/Archived glTF – Runtime 3D Asset Delivery. Con…

I am starting to experiment with customShaders but I have to admit I find this rather restrictive compared to what was possible with GLTF 1. Correct me if I am wrong but it appears only one shader can be assigned to a GLTF model. I used to have several shaders per model, especially when mixing opaqu…

Correct me if I am wrong but it appears only one shader can be assigned to a GLTF model. That’s right. And a fair point. CustomShaderGuide does not give any indication on how I could reuse textures declared in the GLB file and loaded at the same time as the model. This could be solved if cust…

In general, I’m all in favor of pushing forward: adding feature to the glTF 2.0 (and custom shaders) implementation is certainly the way to go. However, I also like to see backward compatibility maintained: is it really impossible to keep the glTF 1.0 implementation as a legacy feature (accessible …

Thanks for pointing that out @coops-propeller Our team is going to discuss what it would take to maintain backwards compatibility with glTF 1.0 and KHR_techniques_webgl.

Hi all, sorry for the delay. It took a while to gather my thoughts on this. I wrote up an Issue in CesiumJS that describes some of the difficulties of supporting glTF 1.0 techniques/KHR_techniques_webgl, as well as a few possible approaches to implementing it. That issue has a ton of detail, so the…

Dropping support for glTF 1.0

CesiumJS

coops-propeller September 1, 2022, 1:12am 10

We’ve hit an issue with our migration here: CustomShader via CZML model?

Topic		Replies	Views
How to use Cesium internal packaging shader when the self-shader is in the b3dm file？ CesiumJS	4	403	July 17, 2019
CustomShader via CZML model? CesiumJS	1	365	September 2, 2022
Support for KHR_technique_webgl with glTF 2.0 CesiumJS	2	494	December 5, 2017
Dynamic (procedural) texture in glTF CesiumJS	12	1574	January 25, 2019
how to custom shader in 3d-tiles? CesiumJS	4	1501	December 24, 2017

Dropping support for glTF 1.0

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