bevy_eidolon

"Reality is illusion"

This is a generic instanced material, mostly for foliage/grass and as a high-performance replacement for gizmos when writing debugging tools. I am planning to use this as a base for other instanced materials by allowing shader overwrites, similar to the MaterialExtension in Bevy.

What is this for?

Drawing a lot of instances (millions) that require GPU-driven rendering with no transparency/alpha masking and that need some variation in scale, color, etc., but can't be reasonably done with the default material pipeline.

Example includes grass, assemblies for foliage/trees and tools to debug them, as well as related systems (scattering, height mapping, obstacles).

[!IMPORTANT] I don't want this to become a monster material that supports everything.

The standard implementation will only ever support simple colors, shapes and basic features.

However, there is an example on how to use the standard PBR lighting, and I don't mind adding specific examples if the API is a bit more mature. I want to focus on composability and declarativity to make it as simple as possible to write new features as custom materials.

Notes

• Uses a custom pipeline for the VisibilityRange because of conflicting indices with the standard pipeline. Might also be replaced by something else in the future.
• This is work in progress, I am open to discussions about the API (cover some shapes, simple cases), for now it's just a proof of concept.