1. A concise explanation of the problem you're experiencing.
I am unable to upload a gltf model version 2.0.
2. A minimal code example. If you've found a bug, this helps us reproduce and repair it.
An error occurred while rendering. Rendering has stopped.
RuntimeError: Unsupported glTF Extension: KHR_technique_webgl
at new RuntimeError (http://localhost:8080/Source/Core/RuntimeError.js:42:19)
at Object.ModelUtility.checkSupportedExtensions (http://localhost:8080/Source/Scene/ModelUtility.js:504:27)
at Model.update (http://localhost:8080/Source/Scene/Model.js:4383:34)
at PrimitiveCollection.update (http://localhost:8080/Source/Scene/PrimitiveCollection.js:369:27)
at updateAndRenderPrimitives (http://localhost:8080/Source/Scene/Scene.js:2939:27)
at executeCommandsInViewport (http://localhost:8080/Source/Scene/Scene.js:2778:13)
at updateAndExecuteCommands (http://localhost:8080/Source/Scene/Scene.js:2586:13)
at render (http://localhost:8080/Source/Scene/Scene.js:3226:9)
at tryAndCatchError (http://localhost:8080/Source/Scene/Scene.js:3246:13)
at Scene.render (http://localhost:8080/Source/Scene/Scene.js:3295:13)
3. Context. Why do you need to do this? We might know a better way to accomplish your goal.
4. The Cesium version you're using, your operating system and browser.
Cesium 1.54. MacOS. Chrome