Export to .glb with embedded images.

[donmccurdy]

@fernandojsg I believe this PR fixes #547 and fixes #551, but due to #552 I am not sure how to test this locally.

[fernandojsg]

@donmccurdy after a quick pass I've just tried it and it "works" but the .glb file contains just [object Object]. I'll check the code to see what is going wrong.

But I don't get any error because of #552 I can't reproduce it /cc @dmarcos @ngokevin any idea what could be causing it?

[fernandojsg]

@donmccurdy I believe one of the needed steps is to update GLTFExporter.js with an updated version from three.js that supports binary: true :D

[donmccurdy]

Ok, I think this is working now — updated GLTFExporter, marked inspector helpers (see #523 (comment)), and filtered them out while exporting.

[arpu]

i had some time to test this! and it works fine

[fernandojsg]

Yeah, thanks for remind me I forgot about this one! Thanks @donmccurdy and @arpu

[arpu]

@donmccurdy if i use
map.wrapS = THREE.RepeatWrapping;
map.wrapT = THREE.RepeatWrapping;
map.repeat.x = 20;
map.repeat.y = 20;
and export the generated gltf model this is not applied to the exported model
is this a known problem ?

[donmccurdy]

Texture repeat, rotation, and offset are not part of the core glTF spec, but require a very recent extension. The THREE.GLTFLoader implementation has not been merged yet (mrdoob/three.js#13831), and no PR for THREE.GLTFExporter exists yet.

EDIT: The wrapS / wrapT part should already be supported, though: https://github.com/mrdoob/three.js/blob/dev/examples/js/exporters/GLTFExporter.js#L740-L741