topic Re: Rendering Draco Compressed GLTF models in ArcGIS Online Questions

Rendering Draco Compressed GLTF models

LironToledo — Thu, 02 Nov 2023 17:57:09 GMT

Hey there, I've been working with the JavaScript SDK for a little while now. Recently, I've been attempting to render some GLTF models inside the SceneView. Managed to do so eventually until I ran into my most recent problem.

Some of the models I wanted to render were on the larger size, so I used draco compression to reduce their size. I'm now noticing that any of the models that have been draco compressed won't render in the scene. I get the following warning in my console log.

[esri.views.3d.layers.graphics.Graphics3DSymbolLayer] gltf loader was not able to load unsupported feature. Required extensions: KHR_draco_mesh_compression

wondering if anyone else has come across this problem before? Any advice for how I can get around it? Thanks!

Re: Rendering Draco Compressed GLTF models

AndreasUlmer — Fri, 17 Nov 2023 11:46:14 GMT

Draco compression is currently not supported for 3D Symbol resources. This is in our backlog but not yet planned for a release.
Basis Universal compressed textures are supported though. If the models contain large textures, maybe this could be worthwhile to reduce size?

Re: Rendering Draco Compressed GLTF models

MartinOver — Wed, 20 Aug 2025 05:44:26 GMT

Draco compression is about meshes, not textures.

Re: Rendering Draco Compressed GLTF models

JonathanStahl — Mon, 27 Oct 2025 10:49:02 GMT

Support for Draco-compressed glTF models was added in the recently released version 4.34 of the ArcGIS Maps SDK for JavaScript. It is now possible to load glTFs that require the KHR_draco_mesh_compression extension in both ObjectSymbol3DLayer.resource and Mesh.createFromGLTF().