OpenGL 4 Shading Language Cookbook - Third Edition

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It is not recommended to import all of the GLM namespaces using the following command:

using namespace glm; 

This will most likely cause a number of namespace clashes. Instead, it is preferable to import symbols one at a time with the using statements as needed. For example:

#include <glm/glm.hpp> 
using glm::vec3; 
using glm::mat4;