Examples: Add EdgeSplitModifier

[Mcgode]

About this feature

This geometry modifier allows the user to build an indexed BufferGeometry, where are split on sharp edges. This allows you to compute normals without smoothing the edges :

Without applying the modifier:

After applying the modifier:

Very useful if you're importing a STL file.

How it's implemented

The feature was implemented as an example, using the same structure as the other modifiers.
It also features an example page, which includes a new binary STL model

Additional notes

The feature is also available as a standalone package:
https://github.com/Mcgode/three-js-edge-split-modifier

This contribution is funded by Dioxygen Software for Dualbox.com

[Mugen87]

Thanks for this but I think it's better to not add more modifiers to this repository. It is already large and hard to maintain. I vote to leave such specialized logic in separate repositories and npm packages. Unless there is really high demand for it.

[DefinitelyMaybe]

I might save this one for later. if we ever open up a 'community-made-features' repo or something similar this would be a cool addition

[mrdoob]

I actually like this!

[mrdoob]

Where's roman_soldier.stl from though?

[Mcgode]

roman_soldier.stl was a model I got from HeroForge some time ago. Thanks for asking since it's actually copyrighted and I shouldn't publish it here.

As a consequence I've removed the model from my git repo and switched to using the cerberus.obj model instead, giving this result :

Falt shaded:

Smooth shaded (no split):

Smooth shaded (with 20° split)

[mrdoob]

Thanks!

[mrdoob]

@Mcgode Do you think it would be possible to build a bevel modifier out of this modifier's code?

[Mcgode]

@Mcgode Do you think it would be possible to build a bevel modifier out of this modifier's code?

I think there's still a long way to go from my code to implement a bevel modifier.