The first "real" post on my new blog.
morgenthum.dev/blog/introdu...
#gamedev #rust #bevy #bevyengine #indiedev #rustlang #architecture
10.03.2026 19:28
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The first "real" post on my new blog.
morgenthum.dev/blog/introdu...
#gamedev #rust #bevy #bevyengine #indiedev #rustlang #architecture
Released bevy_xray, a TUI tool to visualize Bevy state hierarchies, plugin dependencies, and schedule configurations.
crates.io/crates/bevy_...
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Examples: an LOD crate based on VisibilityRange (defaults for high/mid/low poly, overridable per asset), plus navmesh generation via bevy_rerecast + landmass_rerecast. New video mainly shows LOD + vegetation scattering (bevy_map_scatter)..
With that in place I could strip a lot of low-level Bevy specifics out of the game and push them into those mid-level abstractions. I'm also moving more towards a data-/asset-driven setup.
On the engine side I now have self-contained crates like camera, controller, behavior, weather, etc., with schedules/configuration properly encapsulated. I also added a runtime layer for settings, window creation, and other runtime concerns.
The last update was a while ago, so here's the current status: Over the last few weeks I've been working a lot on Wild Spikes and introduced a layered structure to keep technical details out of the game code.
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I have published a documentation website for map_scatter: mapscatter.rs
Check it out.
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map_scatter 0.4.0 is out!
Streaming and Bevy 0.18 support.
Check it out:
map_scatter: crates.io/crates/map_s...
bevy_map_scatter: crates.io/crates/bevy_...
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I still have a few issues with the lighting. The world still looks quite empty with just a few birch trees, mushrooms, and flowers, but that'll change quickly once I have some vegetation models. By the way, those elements were placed using bevy_map_scatter based on certain rules.
#map_scatter
I switched my custom weather implementation to use Bevys atmosphere and sundisk features. I also added several atmosphere presets that I interpolate between during weather transitions - for example, from sunny to rainy
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Released map_scatter and bevy_map_scatter in version 0.3.0! Serde and ron dependencies are now optional.
crates.io/crates/map_s...
crates.io/crates/bevy_...
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It uses the avian3d physics engine (also used in the game for general physics) to top-down raycasts to the ground, to find the height/y-coordinate for the trees.
Migrated the biome generation of Wild Spikes to bevy_map_scatter. Currently using a small scatter plan that only generates one type (one kind of tree). But everything works as expected!
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Oh, because the relative link doesn‘t work on crates.io. Need to fix it, ty!
Examples: github.com/morgenthum/m...
Released bevy_map_scatter on crates.io.
Crate: crates.io/crates/bevy_...
Examples: github.com/morgenthum/m...
#gamedev #rust #bevy #bevyengine #procedural #indiedev #rustlang
Jittered grid position candidates are filtered by a field graph using a simple texture. The scene features a camera with a Bloom component and 3D cubes with emissive colors. A separate system modifies the cubes Y-scale to create this effect.
After releasing map_scatter yesterday, I am working on bevy_map_scatter.
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Finally released map_scatter on crates.io!
Crate: crates.io/crates/map_s...
Examples: github.com/morgenthum/m...
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Candidate positions were generated with Poisson-disk sampling; grass uses a jittered grid. Actual species are placed layer by layer - trees first - by computing per-species probabilities from their own field-graph specifications.
The water is the double sine wave in the middle of the image. It was constructed using the crates Texture-trait to generate the texture programmatically.
A more concrete example using map_scatter: a forest with natural rules, such as "willows are more likely to be near water."
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I’m not sure yet whether I should release map_scatter as engine-agnostic, or if I should first think more about bevy_map_scatter. I’d like to take the Bevy community’s knowledge into account for the Bevy crate.
Points are generated by a jitter grid (with no jitter, so it’s actually just a grid). The first texture is used as the basis for a Euclidean distance transform to calculate the points nearest to the text. These are then filtered with smoothstep and finally rendered as a PNG for this example.
Working on final steps - documentation and examples!
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Final polish is underway. Expect a release in a few days with docs and examples.
If it looks too “generated”: use splat maps from texture paint (e.g., Blender) to drive or filter the rules - paint where to allow/boost/suppress types. Mix authored masks with procedural fields for control.
Works great for 2D - and for 3D too: sample a top‑down position, raycast to terrain for height, then spawn models at the hit. Same rules, different consumer. See my previous post for a 3D in‑game screenshot.
In the example, the rules (grass near river, trees away, mushrooms near trees) are ~250 LOC total. You write small field‑graphs (distance, smoothstep, masks) and compose them into stages/layers. That’s it - rules, not hand‑placed points.
@bevy.org
Announcing map_scatter and bevy_map_scatter: a tiny, engine‑agnostic toolkit for rule‑based object scattering on maps. Build field‑graph rules, run multi‑stage placement, get reproducible results.
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Of course, many species are still missing - just a first attempt.
