blur1d: one-dimensional blur filter. Spreads light to 2 line neighbors. blur2d: two-dimensional blur filter. Spreads light to 8 XY neighbors. 0 = no spread at all 64 = moderate spreading 172 = maximum smooth, even spreading 173..255 = wider spreading, but increasing flicker Total light is NOT entirely conserved, so many repeated calls to 'blur' will also result in the light fading, eventually a
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