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arb fixup

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Zeno Rogue 2020-11-01 11:32:22 +01:00
parent a0574d159f
commit 785b1aa748
1 changed files with 20 additions and 0 deletions
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20
hyperpoint.cpp
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@ -1485,4 +1485,24 @@ EX hyperpoint lerp(hyperpoint a0, hyperpoint a1, ld x) {
return a0 + (a1-a0) * x; return a0 + (a1-a0) * x;
} }
EX hyperpoint linecross(hyperpoint a, hyperpoint b, hyperpoint c, hyperpoint d) {
a /= a[LDIM];
b /= b[LDIM];
c /= c[LDIM];
d /= d[LDIM];
ld bax = b[0] - a[0];
ld dcx = d[0] - c[0];
ld cax = c[0] - a[0];
ld bay = b[1] - a[1];
ld dcy = d[1] - c[1];
ld cay = c[1] - a[1];
hyperpoint res;
res[0] = (cay * dcx * bax + a[0] * bay * dcx - c[0] * dcy * bax) / (bay * dcx - dcy * bax);
res[1] = (cax * dcy * bay + a[1] * bax * dcy - c[1] * dcx * bay) / (bax * dcy - dcx * bay);
res[2] = 1;
return normalize(res);
}
} }