Two axis quaternion constructor with vectors facing away

[gaborpapp]

It seems that the quaternion constructor does not handle the special case when the two vectors are facing away from each other. Using this code:

glm::quat A = glm::quat(glm::vec3(0, 1, 0), glm::vec3(0, -1, 0));
glm::quat B = glm::rotation(glm::vec3(0, 1, 0), glm::vec3(0, -1, 0));

I get different results [0, 0, 0, 1] and [-1, 0, 0, 0]. glm::rotation gives the expected one.

[Groovounet]

So it looks like there is a case where it doesn't work. I first tried:
glm::quat(glm::vec3(1, 0, 0), glm::vec3(-1, 0, 0)); and it worked fine but
glm::quat A = glm::quat(glm::vec3(0, 1, 0), glm::vec3(0, -1, 0));
Worked fine...

[Groovounet]

This issue is fixed in master branch for GLM 0.9.9 release.

Thanks for contributing,
Christophe