It doesn’t appear that environment lighting is supported glTF exports. Perhaps I’m doing it wrong?
Steps to reproduce
According to the EXT_lights_image_based glTF extension spec, Adobe Dimension currently supports glTF exports with this extension.
Previewing the glTF in Babylon, I don’t see the asset rendered with the expected environment light. Inspecting the glTF JSON, I see no such extension declaration.
the file type allows for lights [as does Fbx as well] but the Dev team didn't put them in
as it stands your only 2 options are;
Bummer. We’re working on a glTF modeling workflow that incorporates environment lighting. Sounds like it isn’t ready for prime time. Thanks anyway.
I think its more a case of using the right tool
Dimension is not designed for export lights and there by the wrong tool for those workflows... you can goto the uservoice forums [where the dev team hang out] and add your vote for exportable lights