double theta = glm::radians(90);
glm::vec3 camera(cos(theta), 0, sin(theta));
camera *= 5; // To get some space between camera and object
glm::mat4 matrix = glm::lookAt(camera, glm::vec3(0.0, 0.0, 0.0), glm::vec3(0.0, 1.0, 0,0));