Patrick Walton dd14f3a477

Implement lightmaps. (#10231) ...

![Screenshot](https://i.imgur.com/A4KzWFq.png)

# Objective

Lightmaps, textures that store baked global illumination, have been a
mainstay of real-time graphics for decades. Bevy currently has no
support for them, so this pull request implements them.

## Solution

The new `Lightmap` component can be attached to any entity that contains
a `Handle<Mesh>` and a `StandardMaterial`. When present, it will be
applied in the PBR shader. Because multiple lightmaps are frequently
packed into atlases, each lightmap may have its own UV boundaries within
its texture. An `exposure` field is also provided, to control the
brightness of the lightmap.

Note that this PR doesn't provide any way to bake the lightmaps. That
can be done with [The Lightmapper] or another solution, such as Unity's
Bakery.

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## Changelog

### Added
* A new component, `Lightmap`, is available, for baked global
illumination. If your mesh has a second UV channel (UV1), and you attach
this component to the entity with that mesh, Bevy will apply the texture
referenced in the lightmap.

[The Lightmapper]: https://github.com/Naxela/The_Lightmapper

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Co-authored-by: Carter Anderson <mcanders1@gmail.com>

2024-01-02 20:38:47 +00:00

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