b3dm with external textures reference error

[benjaminabb]

In the 3D Tiles branch, when loading a b3dm file that references external textures like this:

"images":{"tex_5709034.jpg":{"uri":"textures/tex_5709034.jpg"}

The request for texture images then looks like this:

http://localhost:8080/Specs/Data/Cesium3DTiles/Batched/BatchedWithBatchTable/b3dms/R/SW.b3dm/textures/tex_5709034.jpg?v=0.0

which results in

Failed to load resource: the server responded with a status of 404 (Not Found)

The path in not relative to the folder containing the .b3dm file, but to the file itself.

When removing the b3dm header and loading it as an .glb, the textures work fine. Simply adding "../" in front of the path results in not seeing the model at all.

Tested in Chrome and Firefox

[pjcozzi]

@konashredbiker thanks for the report! Do you have a sample 3D Tiles tileset that we can test with? Just a tileset with one simple .b3dm file would be great.

[benjaminabb]

Yes, here I generated a simple one.
b3dmExternalTexture.zip

[pjcozzi]

Thanks @konashredbiker! I added this as a near-term item to the 3D Tiles roadmap, #3241.

[lilleyse]

@sumitshyamsukha Let's work on this after #4344.

In Batched3DModel3DTileContent and Instanced3DModel3DTileContent the basePath should not be the url of the tile, but instead the directory of the tile. You can use getBaseUri for this.

For testing that it works download the sample tileset provided above, host it somewhere (we usually use the 3d-tiles-samples repo for this):

When testing tilesets using this server that you do not want to accidently push to git, create a localTilesets directory, place the tilesets there, and access like 'http://localhost:8003/localTilesets/GitIgnoredTileset/'.

Then in the 3D Tiles Sandcastle replace the url of the first tileset with the url like above. If everything goes smoothly you should see a textured building.

[sumitshyamsukha]

@lilleyse I was trying to host the sample tileset provided, but after running the 3d-tiles-samples repo, I get an error on connecting to http://localhost:8003 that says:

Cannot GET /

I imagine it's most likely something to do with an Express route -- any suggestions on how to fix?

[lilleyse]

You don't need to access 8003 directly, you just need to get the url of the tileset hosted there. Run Sandcastle normally from localhost:8080 and in the 3D Tiles demo change the url of one of the tilesets to http://localhost:8003/localTilesets/NameOfTileset/

[pjcozzi]

Fixed in #4376 thanks to @sumitshyamsukha!

Thanks for the report, @konashredbiker!