Blend the look of the seasons smoothly, also from December back to January

A game that follows the calendar can change its trees, grass and sky with the seasons. Switching on a date looks abrupt, and a blend that stops at the last season makes the world jump on New Year's Day. Here is how to run the year around in a circle, for real years or for a world with its own length.

Why this works

A year is a circle, not a line, so December leads back into January with nothing in between. Treating the seasons as points on that circle, each holding for a while, avoids the seam and keeps every season recognisable.

When not to use it

Skip it when a season is a strict game rule, such as a festival that starts on one exact day or crops that only grow in spring. Then switch at a clear moment so the player can plan around it.

In the full entry

• What to build, step by step
• Starting values and the reason for each
• 3 common mistakes and the fix
• 28 lines of example code with 4 checks that pass
• How your AI shows you that it works

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Use the Spielerando entry "Blend the look of the seasons smoothly, also from December back to January" (read_entry seasons-blend-around-the-year-without-a-jump-at-new-year) in my game. Build it step by step, and show me how you checked that it works.

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