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matrix: check that the look_at up vector is normalised

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Danny Robson 2016-10-07 17:32:28 +11:00
parent 2e54950b1a
commit a78ed2b879
1 changed files with 2 additions and 0 deletions
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matrix.cpp
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@ -280,6 +280,8 @@ matrix<S,T>::look_at (util::point<3,T> eye,
util::point<3,T> target, util::point<3,T> target,
util::vector<3,T> up) util::vector<3,T> up)
{ {
CHECK (is_normalised (up));
auto forward = normalised (eye.to (target)); auto forward = normalised (eye.to (target));
auto side = normalised (cross (forward, up)); auto side = normalised (cross (forward, up));
up = cross (side, forward); up = cross (side, forward);