if the model is compressed， it does not work in IE11 browser

[vaseala]

Bugs

• Bug repro on github pages:
• Expected result: run normal in IE11
• Current result: the page with the compressed model does not work in IE11 browser

descriptions

I had read the forum , but can not solve the problem。

links

model uncompressed
model compressed

files description

box.glb

a simple model, only has a simple cube model, then exported from blender.

box.min.glb

the same model with box.glb, just use compression when export.

compressed.html

render the box.min.glb model

uncompressed.html

render the box.glb model

[deltakosh]

Pinging @bghgary (I guess this is probably related to promise polyfill?)

[bghgary]

I don't believe this ever worked. Draco has to be compiled with a flag to enable IE and I've never compiled Draco until I investigated this issue. But even after I do that, there are some issues that I can't resolve easily.

I'm trying to figure out what happened with emsdk/emscripten such it now wants to use Promise in the fallback Draco js, but I have some trouble.

Here are all the relevant links:

google/draco#405

This PR adds a flag you can pass to Draco CMake so that it can build for IE. I don't believe this flag is enabled for the pre-built versions, but I'm not 100% sure.

google/draco#596

I filed this issue to see if Draco folks can help with this.

[bghgary]

https://forum.babylonjs.com/t/ie11-promise-is-not-defined/9438

[vaseala]

It helped me a lot！
@bghgary thanks very much！