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added set_view function

This commit is contained in:
Zeno Rogue 2020-09-11 11:11:30 +02:00
parent ec6068944f
commit 59a7d3e562
1 changed files with 44 additions and 0 deletions
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44
hypgraph.cpp
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@ -2426,4 +2426,48 @@ EX void shift_view_towards(shiftpoint H, ld l) {
}
}
EX void set_view(hyperpoint camera, hyperpoint forward, hyperpoint upward) {
transmatrix V = gpushxto0(camera);
forward = V * forward;
upward = V * upward;
if(pmodel == mdGeodesic || hyperbolic || sphere) {
forward = inverse_exp(shiftless(forward));
}
else {
// apply_nil_rotation(forward);
forward -= C0;
}
if(hypot_d(3, forward) == 0) forward[0] = 1;
forward /= hypot_d(3, forward);
if(pmodel == mdGeodesic || hyperbolic || sphere)
upward = inverse_exp(shiftless(upward));
else {
// apply_nil_rotation(upward);
upward -= C0;
}
upward -= (forward|upward) * forward;
if(hypot_d(3, upward) == 0) return;
upward /= hypot_d(3, upward);
hyperpoint rightward = (forward ^ upward);
rightward -= (forward|rightward) * forward;
rightward -= (upward|rightward) * upward;
rightward /= hypot_d(3, rightward);
transmatrix rotator = Id;
rotator[2] = forward;
rotator[1] = -upward;
rotator[0] = -rightward;
if(det(rotator) < 0) rotator[0] = -rotator[0];
View = rotator * inverse(rgpushxto0(camera));
}
}