Compiling serde_json v1.0.59
error[E0658]: use of unstable library feature 'btreemap_remove_entry'
How can I fix this problem?

• Hello Sir, I have read Learning to Fly: Let's create a simulation in Rust! (pt 1), and it's really beautiful and useful. So I wanna translate it into Chinese. I'll mark the source of it. Can I do this?

I convert the web pack app part into a vite/react-ts project then try to play a bit with the code and found an interesting thing.

PS: I changed to fov angle to PI/2 but that's not the point.

I try to render the fov because your 'arcs' seems a bit off and here's what I saw.

It comes from this part

I don't know why you added Math.PI / 2.0 here ? probably because otherwise we see the fov on the side and not in front of them, but IT REALLY is on the side, you can look with your drawn arcs and this is why birds are constantly turning.

Awesome tutorial. I really love it.

I think I found a small misunderstanding in the tutorial. In the explanation of process_vision of eye it says at the second point where the angles are handled:

    // Returns vector's direction relative to the X axis, that is:
    //
    //   --> = 0° = 0
    //
    //    |  = 90° = PI / 2
    //    v
    //
    //   <--- = 180° = PI
    //
    // (if you've been measuring rotations before - this is atan2
    // in disguise.)
    let angle = na::Rotation2::rotation_between(
        &na::Vector2::y(),
        &vec,
    ).angle();

According to the code, it should explain the vector's direction according to the Y axis.

See also: https://play.rust-lang.org/?version=stable&mode=debug&edition=2021&gist=b7024ce656547f3095bc35dbadd36a41

I know the README.md states this is licensed in MIT, but it would be better to have an explicit LICENSE.txt file. There are several variants of MIT license, so which is it?
Even better to have an SPDX tag in each source file.

Thank your write the learning-to-fly series, I am waiting for part4.

Got this err at line 42 of Chromosome.rs. Due to that IntoIterator() breaks a number of other places. Surprised this hasn't popped up before. Using rustc 1.68.2.

I followed readme and failed on "wasm-pack build --release"
the versions :

[root@VM-16-13-centos simulation-wasm]# cargo --version
cargo 1.51.0 (43b129a20 2021-03-16)
[root@VM-16-13-centos simulation-wasm]# rustc --version
rustc 1.51.0 (2fd73fabe 2021-03-23)
[root@VM-16-13-centos simulation-wasm]# rustup --version
rustup 1.23.1 (3df2264a9 2020-11-30)

the error info:

error[E0658]: `impl Trait` in type aliases is unstable
  --> libs/genetic-algorithm/src/chromosome.rs:41:21
   |
41 |     type IntoIter = impl Iterator<Item = f32>;
   |                     ^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = note: see issue #63063 <https://github.com/rust-lang/rust/issues/63063> for more information
   = help: add `#![feature(min_type_alias_impl_trait)]` to the crate attributes to enable

warning: the feature `type_alias_impl_trait` is incomplete and may not be safe to use and/or cause compiler crashes
 --> libs/genetic-algorithm/src/lib.rs:1:12
  |
1 | #![feature(type_alias_impl_trait)]
  |            ^^^^^^^^^^^^^^^^^^^^^
  |
  = note: `#[warn(incomplete_features)]` on by default
  = note: see issue #63063 <https://github.com/rust-lang/rust/issues/63063> for more information

error: aborting due to previous error; 1 warning emitted

new to rust, what should i do?

I'm waiting for part 3 of the tutorial series :)

Hi! Can you explain why when you calculate a new angle and speed, you add the results of the neural network calculation (r0 and r1) for the speed, and subtract the results for the angle? Link below.