Turns out we can avoid a square root and a division.
Patch comes even with proof: https://raw.org/proof/quaternion-from-two-vectors
(I also tested it a while and indeed got same results)
git-svn-id: svn://svn.code.sf.net/p/irrlicht/code/trunk@6511 dfc29bdd-3216-0410-991c-e03cc46cb475
The exact commands to make this commit were:
git reset --hard origin/master
find -type f | # list all regular files
grep -E '\.(h|cpp|fsh|vsh|mm)|LICENSE$' | # filter for text files
xargs -n 1 -P $(nproc) sed -i 's:\s*$::' # for each file, trim trailing whitespace including the CR
git commit -a
GLES drivers adapted, but only did make compile-tests.
git-svn-id: svn://svn.code.sf.net/p/irrlicht/code/branches/ogl-es@6038 dfc29bdd-3216-0410-991c-e03cc46cb475
