Very extensive list !
I also propose AMF (http://en.wikipedia.org/wiki/Additive_Manufacturing_File_Format) loader.
(3d file format used for 3d printing).
I already have the basics of the loader done, so I could modify it a bit and add to the examples.

Most of these loaders are more important for special cases such as an editor, because for let's say games it might be better to convert into the three.js format straight away, right? In these cases the converters/exporters are more important.

We've tested glTF as a replacement for three's formats as an optimization - there the data is binary and can be compressed with geom compression.

Herst notifications@github.com kirjoitti Oct 28, 2014 kello 5:38 PM:

Most of these loaders are more important for special cases such as an editor, because for let's say games it might be better to convert into the three.js format straight away, right? In these cases the converters/exporters are more important.

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@kaosat-dev Added to the list!
@Herst Yes. It's mostly for editors or apps that don't require fast load times.

I am also looking for a IGES loader. I would even maybe start building one myself but not sure where to start.

how about adding 3DM (used by Rhinoceros) to the list?

@nyaaao added. thanks!

About 3DS Loader :

Hi everyone, long time ago, I needed to make a 3DS loader for 3DzzD Web 3D engine, that was a little hard to do... not difficult to obtain some first results but rather to handle all the chunks correctly, but after some times I managed to produce a pretty efficient loader. the 3DS file format spécifications are difficult to find, but I finished to find one that worked pretty well. I 've built the loader for 3DzzD with this documentation and it works even better than the one in the current photoshop (better handle on pivot/smooth groups/scale/ keyframe/etc...), so here is the spécifications I have used (3DzzD source code is opensource and may help but code is really ugly... a ten years old project...)

http://dzzd.net/3DSChunkDefinitions.html

About OBJ Loader :

I modified the current OBJ loader and get about at least 10/15 FPS more on a lot of 3d models, but for now I did not found how I should do to post these changes ?

The problème was mainly due to the fact that the current OBJ loader create too many objects (more than the original 3d model, one object created at each material change) and also the 3dFaces with same material was not groupped together even within the same object, and was producing too many WebGL calls

http://dzzd.net/3DSChunkDefinitions.html

Thanks! Added to the first post.

The problème was mainly due to the fact that the current OBJ loader create too many objects (more than the original 3d model, one object created at each material change) and also the 3dFaces with same material was not groupped together even within the same object, and was producing too many WebGL calls

Oh! Interesting. You mean the OBJMTLLoader one though. Right?

Oh! Interesting. You mean the OBJMTLLoader one though. Right?

Yes,, to be more precise the "if ( /^usemtl /.test( line ) ) " block create a new object/mesh for each material switch, this ends with poor performance and a wrong objects hierarchy.

I will post a simple test case showing the difference between both the current loader and the one modified (difference is mainly noticeable on mobile device)

Here is the test case for the current loader and the one optimised :

http://demo.dzzd.fr/threejs/OBJMTLLoaderTest/

EDIT:
I got 10 FPS on GalaxyTab3 with the current loader and more than 60 FPS with the new one, difference may be hard to see on fast devices

PS: If you wonder where the 3D model comme from :)

Does anyone know about IGES. I could really use an IGES loader. If someone could just point me in a direction to start on how to build one? Or if there is one out there somewhere. I noticed the folks at http://www.3dfile.io/ and some of the other 3D visualization sites are using ThreeJS and allowing for IGES uploads.

Nope

Regarding a 3dm loader: I've started work on this now that the openNURBS library has been compiled to wasm thanks to emscripten (rhino3dm).

I'm working on this here and have mesh, breps, extrusions, pointclouds, materials, layers, and groups support started and working.

Relevant files:

• loader
• library
• example html
• example file

I hope to submit a PR that has support for more object types sometime soon. I must admit that I've little experience with web workers, and am leaning on the draco and basis loader examples. Hopefully #18234 simplifies this a bit.

p.s. we are already adding threejs support directly to the rhino3dm.js library like here and here.

Edit: update links to point to McNeel org fork.

We can check this one off ;)

IFCLoader just landed! 🍾 #20598

Any update about M2Loader? Anyone working with that?

@Faq Not that I know of...

FYI: TIFFLoader has been added via #24420 🎉 .

Any update about M2Loader? Anyone working with that?

I've recently implemented a basic loader for M2 assets for a small personal project. If you want to play around with the code, you can access it via: https://gist.github.com/Mugen87/c96757cec0f7ec02214d6fdea880dec9

Use M2Loader like so:

const loader = new M2Loader();
loader.load( 'models/m2/cat/druidcat2.m2', function ( mesh ) {

    scene.add( mesh );

} );

And you get:

We can potentially add the loader's code to the repo. However, adding an example is problematic since all M2 assets I have found so far are directly from WoW and not available under an appropriate license.

Independently, I would love to add more features to the loader over time. Especially animations and multi-textured assets as well as supporting more asset versions.

I've played World of Warcraft in the past (nightelf druid, feral build) and loved the entire art design so much. Now seeing game assets rendered so nicely with three.js makes me a bit emotional 😊.

Multi-textured assets work now (example 7ne_druid_worktable02.m2):

Now comes the most complex part: Skeletal animation.

I've created a new repository three-m2loader for maintaining/developing M2Loader.

https://github.com/Mugen87/three-m2loader