UV unwrapping extension

[Josh]

@reepblue pointed out this library for UV unwrapping:
https://github.com/jpcy/xatlas

I added these values to the AssetEditor class:

• asseteditor.model: the open model, if it exists.
• asseteditor:Invalidate(): Triggers a viewport redraw.
• asseteditor:Modify(): Causes the file to be set as "modified".
• asseteditor.modelmenu: Menu displayed when a model is loaded.

The event EVENT_INITASSETEDITOR is emitted when an asset editor window is initialized, so you can add a menu item to the modelmenu at this time.

Since Lua can call functions from a DLL, that should be everything needed to create an unwrapping extension.

[Josh]

You don't have to save or load any file formats. You just copy data into their mesh structure to process it:
https://github.com/jpcy/xatlas/blob/f700c7790aaa030e794b52ba7791a05c085faf0c/source/xatlas/xatlas.h#L108

Looks not very hard.

[Josh]

Here is some code if you want to make a Lua module:
https://github.com/UltraEngine/Lua/tree/main/Modules

The simpler way is to create a C API for the lib and interface with that, maybe using the Ultra buffer class to construct a data structure in memory.

[reepblue]

I really hope someone will get to making this. 🙂