Kelsi 12bcd0ef8c fix(brush): defensive guards in EditorBrush::getInfluence ...

Three issues:
1. NaN distance returned 1.0 (full influence) because distance >=
   radius is false for NaN; the inner-radius check then returned 1.
2. Non-positive radius would divide by zero in the t computation.
3. falloff = 0 produces division by zero in the outer falloff path.

Also clamps falloff to [0,1] so a slider extreme can't break the math.

2026-05-06 07:38:50 -07:00

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