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Use a clamped cubic for the line-line switchover - #23
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Replace `tanh` in the line-line force switchover with `1 - (1 - x/3)^3` for `x < 3` and `1` after. It has the same slope at zero and a similar shape, continuous first and second derivatives, and reaches exactly 1, so far from parallel segments use only the closest point energy. It also has no `exp`, which makes it easy to vectorize. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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Replace
tanhin the line-line force switchover with1 - (1 - x/3)^3forx < 3and1after. It has the same slope at zero and a similar shape, continuous first and second derivatives, and reaches exactly 1, so far from parallel segments use only the closest point energy. It also has noexp, which makes it easy to vectorize.