Andras Schmelczer
734d51bee3
The host's markdown renderer doesn't support <video> tags, so the embed rendered blank. Linking directly works in every viewer. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
20 lines
1.2 KiB
Markdown
20 lines
1.2 KiB
Markdown
# Ember
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A particle simulation that renders drifting embers carried by a Perlin-noise wind field, recorded to an MP4.
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Sample output: [`animation.mp4`](animation.mp4) (variants: [`animation-day.mp4`](animation-day.mp4), [`animation-night.mp4`](animation-night.mp4)).
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## How it works
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- `ember.py` — each `Ember` spawns at the bottom edge with a randomized size, color offset, lifespan, and updraft, then fades out as its time-to-live expires or it nears a screen border. Drawn as a soft anti-aliased circle blended into the previous frame's trail.
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- `wind.py` — `WindField` samples 3D Perlin noise (x, y, time) on a downscaled grid for each axis, with bilinear interpolation back up to pixel coordinates.
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- `main.py` — drives the loop: fades the previous frame slightly each tick (the trail effect), advances the wind field, updates and draws every ember, and writes each frame to an MP4 via `imageio`.
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## Run it
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```sh
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pip install pygame numpy imageio imageio-ffmpeg noise tqdm
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python main.py
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```
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Tweak `EMBER_COUNT`, `WIND_STRENTH`, `RUNNING_TIME_IN_SECONDS`, or `FRAME_RATE` at the top of `main.py`. Set `IS_DEVELOPMENT = True` to watch the simulation in a window instead of writing to disk. Resolution lives in `config.py`.
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