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Use a consistent seed for AABB gizmo colors (#9030)

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# Objective

The bounding box colors are from bevy_gizmo are randomized between app
runs. This can get confusing for users.

## Solution

Use a fixed seed with `RandomState::with_seeds` rather than initializing
a `AHash`.
The random number was chose so that the first few colors are clearly
distinct.

According to the `RandomState::hash_one` documentation, it's also
faster.


![bevy_bounding_box_colors_2023-07-03](https://github.com/bevyengine/bevy/assets/26321040/676f0389-d00e-4edd-bd77-1fbf73a3d9fa)

---

## Changelog

* bevy_gizmo: Keep a consistent color for AABBs of identical entities
between runs
This commit is contained in:
Nicola Papale 2023-07-03 22:46:50 +02:00 committed by GitHub
parent 01eb1bfb8c
commit 7aa0a47607
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GPG key ID: 4AEE18F83AFDEB23
1 changed files with 5 additions and 6 deletions
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11
crates/bevy_gizmos/src/lib.rs
View file

@ -16,7 +16,6 @@
//!
//! See the documentation on [`Gizmos`](crate::gizmos::Gizmos) for more examples.
use std::hash::{Hash, Hasher};
use std::mem;
use bevy_app::{Last, Plugin, Update};
@ -52,7 +51,6 @@ use bevy_render::{
Extract, ExtractSchedule, Render, RenderApp, RenderSet,
};
use bevy_transform::components::{GlobalTransform, Transform};
use bevy_utils::AHasher;
pub mod gizmos;
@ -235,12 +233,13 @@ fn draw_all_aabbs(
}
fn color_from_entity(entity: Entity) -> Color {
use bevy_utils::RandomState;
const U64_TO_DEGREES: f32 = 360.0 / u64::MAX as f32;
const STATE: RandomState =
RandomState::with_seeds(5952553601252303067, 16866614500153072625, 0, 0);
let mut hasher = AHasher::default();
entity.hash(&mut hasher);
let hue = hasher.finish() as f32 * U64_TO_DEGREES;
let hash = STATE.hash_one(entity);
let hue = hash as f32 * U64_TO_DEGREES;
Color::hsl(hue, 1., 0.5)
}