3MFLoader: Add Preliminary Support for Loading Implicit Functions

[zalo]

Related issue: #29548

tl;dr: This PR adds basic implicitfunction (parsing only!) functionality to three.js's 3MFLoader.

Context

3MF files can now contain volumetric implicits defined as operation execution graphs.

The 3MF consortium has released a 3D Modeller for generating .3mf’s with them, similar to nTopology:
https://github.com/3MFConsortium/gladius

This presents an opportunity to make SDF Implicits a first-class feature of 3D on the web!

Description:

This PR advances this goal by adding a parser that exposes this new information to three.js.

Eventually, when TSL and WebGPU are mature, this information can be used to construct a TSL nodegraph, which can be used to import and visualize these 3MF implicit functions.

You can test this PR easily by going here, selecting volumetric from the drop-down, and observing the implicit tree that was output to the console.

[linbingquan]

It reported an error on my computer...

[Mugen87]

The asset should trigger the warning for testing. It can't be rendered right now.

@zalo I wonder if it's better to remove the asset to avoid further confusion when users checking out the example.

[zalo]

I can switch it for one that has a mesh-component (which should load even without implicits), though, they tend to require a special node operation which gives the signed distance to the mesh (which might need something like three-mesh-BVH to sample on the GPU).

[Mugen87]

In this case I would simply revert the changes to the example to keep things simple.

[Mugen87]

8104618