Author | Lightnews

Chris Biscardi

@chrisbiscardi.bsky.social

5.3K followers 340 following 540 posts

Rustlang and Rustlang accessories * YouTube: https://www.youtube.com/@chrisbiscardi * Learn Rust: https://www.rustadventure.dev/ * Rust Discord: https://discord.gg/GJ5UfxzUcP * Party Corgi Content Discord: https://discord.gg/partycorgi

www.youtube.com

Posts Media Videos Starter Packs

Chris Biscardi @chrisbiscardi.bsky.social · 1d

2d visibility mesh, passed into a post-process shader and obscuring non-visible areas

Chris Biscardi @chrisbiscardi.bsky.social · 1d

Starting a patreon is one thing, but building the community that funds the patreon typically has to be the first concern.

For example: if everything you do is locked behind a patreon paywall, then nobody will be able to share that with others and it's hard to grow the group of patreon members.

1 1

Chris Biscardi @chrisbiscardi.bsky.social · 2d

(The latest was a wasm document and related code examples)

Chris Biscardi @chrisbiscardi.bsky.social · 2d

jeez I have scripts and workshops that I completely wrote, finished, and forgot to ever publish.

1 2

Chris Biscardi @chrisbiscardi.bsky.social · 4d

Yeah that's a problem in the "pick the closest wall" section of the demo. Given two rays with a series of hits each, how do you pick the right wall to draw the triangle on

Chris Biscardi @chrisbiscardi.bsky.social · 4d

Yeah definitely an open question, and I think with some use case based answers

Chris Biscardi @chrisbiscardi.bsky.social · 4d

nope, that's it. Its nothing special. I'll do some profiling and maybe some optimizations after I fix the bugs that are left. will look into more serious optimizations like bvh, etc if I need to.

Chris Biscardi @chrisbiscardi.bsky.social · 4d

I'm only shooting rays at the vertices so they're all guaranteed "hits" from that perspective. I'm not firing arbitrary numbers of rays hoping they hit, thus there's no resolution issues with number of rays that may or may not hit a vertex, etc.

Chris Biscardi @chrisbiscardi.bsky.social · 4d

I mean, in a 2d game how many vertices are you actually drawing? Its not 3d and there's no million+ vertex meshes.

Chris Biscardi @chrisbiscardi.bsky.social · 4d

oh and the "algorithm to get the points to raytrace towards" is just "grab the vertices from the meshes".

1 1

Chris Biscardi @chrisbiscardi.bsky.social · 4d

So there's plenty of things to optimize but I'm not shooting any rays that don't hit. I haven't noticed any issues while I've been working on it, so its sitting somewhere well under 120fps frame budget with all that said.

1 1

Chris Biscardi @chrisbiscardi.bsky.social · 4d

I haven't finished the implementation, so haven't benchmarked anything yet.

The algorithm iterates over the vertices in sorted angle order, doing line/segment intersection for each. There's no bvh, I'm naively redoing all the work every frame, and I'm running in dev profile with no optimizations

Chris Biscardi @chrisbiscardi.bsky.social · 4d

Yes

Chris Biscardi @chrisbiscardi.bsky.social · 4d

nothing in this is an sdf

Chris Biscardi @chrisbiscardi.bsky.social · 4d

and with rnadom shapes

1 2

Chris Biscardi @chrisbiscardi.bsky.social · 4d

with wireframes

1 2

Chris Biscardi @chrisbiscardi.bsky.social · 4d

getting closer

1 1 3

Chris Biscardi @chrisbiscardi.bsky.social · 4d

progress on the 2d visibility mesh demo.

We built out raytracing from scratch, now just need to take advantage of it to fill in the rest of the triangles

2 1 24

Chris Biscardi @chrisbiscardi.bsky.social · 4d

Now what *does* happen, is that because observers are recursive, if you "trigger C; queue D" vs "queue D; trigger C" you will see different behavior.

This is because the observer will always run to completion before continuing. One of these images is the former, and the other is the latter.

Chris Biscardi @chrisbiscardi.bsky.social · 4d

Observers run their command queues recursively, immediately. So you don't need to "place apply_deferred in the right spot".

For example, if you trigger observer A and B in sequence, then in A's handler you trigger Observer C and queue a command D; C and D run before B.

Reposted by Chris Biscardi

Jondolf @jondolf.bsky.social · 4d

Avian is getting pretty big nowadays! To mark the start of a new release cycle, I spent some time improving our processes moving forward.

Notably, Avian now stores migration guides in-repo, similar to Bevy:
github.com/avianphysics...

Store migration guides in the repository by Jondolf · Pull Request #867 · avianphysics/avian

Objective Closes #742. Until now, we have had the following process: Each PR that has a breaking change is marked with C-Breaking-Change, and gets a ## Migration Guide section At the end of the re...

github.com

2 4 38

Chris Biscardi @chrisbiscardi.bsky.social · 4d

there's so much cool ui in pokemon za

Chris Biscardi @chrisbiscardi.bsky.social · 5d

Cinnog is what I use for This Week in Bevy.

thisweekinbevy.com

Niklas Eicker @nikl.me · 5d

The experimental static site generator Cinnog is now updated to #leptos 0.8 and #bevy ECS 0.17

Write static sites with in Leptos island mode. Bevy ECS is used as a data layer that can be queried with "normal" rust code.

github.com/NiklasEi/cin...

GitHub - NiklasEi/cinnog: Experimental static site generator using Leptos with Bevy ECS as a data layer

Experimental static site generator using Leptos with Bevy ECS as a data layer - NiklasEi/cinnog

github.com

1 17

Chris Biscardi @chrisbiscardi.bsky.social · 5d

re: gotchas in the proposed solution.

I haven't tested this at all in that capacity, so just don't know.

That said, it uses a queued command to power the behavior, which works well with observers and their recursive execution. So no frame delay but maybe something more subtle?

Chris Biscardi @chrisbiscardi.bsky.social · 5d

re: upstreaming, something that has the behavior people expect will be upstreamed. Alice is very aware of this and wants it to happen.

1 2