matrix: check that the look_at up vector is normalised

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