Today I will be working on the import of glTF format to #bigdatabrowser. It is a common format to store 3D scenes and object (meshes), so it would be nice to have it. As a datasource, real life and 3D model, I will be using this guy. Let's see how far I can go (1/N) - ThreadSky

ekatrukha.bsky.social • 13 days ago

Today I will be working on the import of glTF format to #bigdatabrowser. It is a common format to store 3D scenes and object (meshes), so it would be nice to have it. As a datasource, real life and 3D model, I will be using this guy. Let's see how far I can go (1/N)

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ekatrukha.bsky.social•13 days ago

I've already obtained its 3D mesh/view using my phone and Polycam app (link https://poly.cam/capture/b31e2dd5-7979-4e22-a7c5-0e93ba74314e). So I know it is supposed to look like this (see below). I can download gbl format file, it is available via the link (2/N)

ekatrukha.bsky.social•13 days ago

For the file reading, I will be using https://github.com/javagl/JglTF java library. It looks pretty complicated, but let's see if I can first extract at least the positions of vertices (points) of the underlying mesh (3/N)

ekatrukha.bsky.social•13 days ago

Hmmm, turns out it is a pretty complicated library, everything is stored as buffers. I am going to torture LLM for help (4/N)

ekatrukha.bsky.social•13 days ago

All right, I can read the array of 3D vertices!
The final result looks correct, pretty much like a teddy bear.

I must say that in this rendering mode (without surface/depth), the tail somehow looks unintentionally ambiguous (5/N)

ekatrukha.bsky.social•13 days ago

Next step is to render the surface as a collection of triangles.

The first attempt relies on my naive assumption that in an array of vertices the triangles are encoded sequentially: vertices (0,1,2) triangle 1, vertices (3,4,5) triangle 2, etc
Clearly, it is not the case (6/N)

ekatrukha.bsky.social•13 days ago

Love this error.
Are you ok, buddy?
We had some minor interference during teleportation.

ekatrukha.bsky.social•13 days ago

In practice, triangles are often encoded by "vertex indices", to reduce the amount of data. So two triangles with the same edge will have vertex indices (0,1,2) and (1,2,3). So vertices are "reused", just 4 vertices (not 6) for 2 triangles.
Now I need to see where to get those indices. (7/N)

senger.bsky.social•13 days ago

🤣

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