Nether-Animation-Java

I started playing with shader-style math and ended up with this simple “nether” animation written in plain Java.

The program:

• Renders a sequence of frames using a tiny CPU-side “shader”
• Writes them as PPM images (binary P6 format)
• Calls FFmpeg to turn the frames into an MP4 video

I’m using PPM instead of PNG because:

• It’s extremely easy to write (tiny header + raw RGB bytes)
• No compression - > faster to generate
• Perfect for synthetic frames and feeding into FFmpeg

The only real downside is larger file size for the intermediate frames, but they’re temporary and easy to delete.

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Video preview

nether.mp4