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Reduce the number of times normalize is called

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Brendan Zabarauskas 2012-12-28 19:48:39 +10:00
parent cc465910de
commit a8da96eda4
1 changed files with 2 additions and 2 deletions
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4
src/mat3.rs
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@ -227,8 +227,8 @@ pub impl<T:Copy Float> Mat3<T> {
#[inline(always)] #[inline(always)]
static pure fn look_at(dir: &Vec3<T>, up: &Vec3<T>) -> Mat3<T> { static pure fn look_at(dir: &Vec3<T>, up: &Vec3<T>) -> Mat3<T> {
let dir_ = dir.normalize(); let dir_ = dir.normalize();
let up_ = up.normalize().cross(&dir_).normalize(); let side = dir_.cross(&up.normalize());
let side = dir_.cross(&up_).normalize(); let up_ = side.cross(&dir_).normalize();
Mat3::from_axes(up_, side, dir_) Mat3::from_axes(up_, side, dir_)
} }