Patrick Walton dd14f3a477 Implement lightmaps. (#10231) ...  # 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. --- ## 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 --------- Co-authored-by: Carter Anderson <mcanders1@gmail.com>		2024-01-02 20:38:47 +00:00
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src	Implement lightmaps. (#10231)	2024-01-02 20:38:47 +00:00
Cargo.toml	Re-export smallvec crate from bevy_utils (#11006)	2023-12-24 15:35:09 +00:00