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better distance approximation in Nil

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Zeno Rogue
2019-10-06 11:51:10 +02:00
parent 69d0284745
commit e38e001454
2 changed files with 5 additions and 1 deletions
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4
hyperpoint.cpp
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@@ -850,6 +850,10 @@ EX ld hdist0(const hyperpoint& mh) {
auto phi = atan2(mh[2], mh[3]);
return hypot(cosh_r < 1 ? 0 : acosh(cosh_r), phi);
}
case gcNil: {
ld bz = mh[0] * mh[1] / 2;
return hypot(mh[0], mh[1]) + abs(mh[2] - bz);
}
default:
return hypot_d(GDIM, mh);
}