Logiker Christmas 2022 Challenge Commodore Results

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• I sit here in late March, with it dumping about 5 inches of snow so far at 5AM.

  Are there any competitions, or collections of source code, for various types of bitmapped snowfall? Either diddled bitmaps or exploiting C64 sprites.

  Over the decades I have seen several stylized snowfalls showing the effects we see in real life, where some flakes take a slightly different path to ground due to different wind currents. Sadly, 35+ years later I have no recall of what programs or demos stood out.

  I can say that in winter 2024, I did finally figure out how the Waveform Christmas Hits demo creates twinkling snowfall in the first screen. The key is that the overview of the mountain town takes place at night. The white flakes fall through a black sky. The twinkling only appears in the sky. It turns out in this video mode, you can define certain color cells 8×8 (or 4×8?) to be black. So when the snowflake bits are passing through these color cells, they appear to wink out. 8 lines later, the snowflake re-emerges when it’s drawn in an area whose 8×8 color cell is not black. Very effective trick. Try as I might, while watching the demo I cannot see the 8×8 “black brickwork appear. But I imagine if one recorded it and played it back at 4x or 8x, the black square “holes” would become noticeable. Very artistic presentation with no additional programming work really. Quality!

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