// rotate bone's y-axis with target.
AnimPose boneLookAt(const glm::vec3& target, const AnimPose& bone) {
glm::vec3 u, v, w;
generateBasisVectors(target - bone.trans(), bone.rot() * Vectors::UNIT_X, u, v, w);
glm::mat4 lookAt(glm::vec4(v, 0.0f),
glm::vec4(u, 0.0f),
// AJT: TODO REVISIT THIS, this could be -w.
glm::vec4(glm::normalize(glm::cross(v, u)), 0.0f),
glm::vec4(bone.trans(), 1.0f));
return AnimPose(lookAt);
}
