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What type of snow effect do you want? Falling 'dots' or a snowflake image?
As you probably know, there are a couple of source code examples that come with the Blitz2 install that could be easily modified. 'smoothscrolling.bb2' scrolls a screen of dots with the mouse. With some mods, this could easily be snow continually falling down the screen. There are a couple of examples also that bounces balls around the screen. Replace the ball with a snowflake image and just move it down and instant snow effect. On the 'BUM' disks somewhere there are some code examples displaying some nice parallax star field effects that again could be modified quite quickly into snow.
Of course, the CPU time question depends on what else may be happening as well?
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