Open nithinp7 opened 2 years ago
Do you know which type of GLBs are affected? Is the GSModels
or the GTModels
?
I've noticed it with Elevation and GSModels glbs. GTModels are not completely supported yet in cesium-native (at least the instanced ones) so those may secretly have the same issue too even though it's hidden for now.
I'm not sure if it's related, but I'm going to retile with this branch I opened a while ago just to check: https://github.com/CesiumGS/cdb-to-3dtiles/pull/62.
@nithinp7 Did retiling on that branch help resolve your issue?
@sanjeetsuhag I finally got around to retiling again with the branch, the issue seems to still remain. I had to comment out our alignment validation check to get EXT_feature_metadata buffers to work.
I think the issue is here: https://github.com/CesiumGS/cdb-to-3dtiles/blob/4fbb27dd1a3322b0274e3694658896d80f2de371/CDBTo3DTiles/src/Gltf.cpp#L529
All metadata buffers are just tacked onto the end of the 0th buffer, with no padding.
This pertains specifically to #58
I ran into this issue with a cdb-to-3dtiles-next tileset, it seems like sometimes the metadata buffers aren't 8-byte aligned (as the extension spec prescribes). I briefly looked through the cdb-to-3dtiles code and I didn't catch any 8-byte alignment of the metadata buffers, so that seemed to confirm my understanding.
Again I looked only briefly at the code here; the issue may be a bad implementation on my end or a misunderstanding of the spec even, feel free to close this if that is the case!
@sanjeetsuhag