void mouse_button_callback(GLFWwindow* window, int button, int action, int mods)
{
    if (button == GLFW_MOUSE_BUTTON_LEFT && action == GLFW_PRESS){

       double xpos, ypos;
       glfwGetCursorPos(window, &xpos, &ypos);
       mouseSpeed.p[0] = xpos;
       mouseSpeed.p[2] = ypos;

    }

    if (button == GLFW_MOUSE_BUTTON_LEFT && action == GLFW_RELEASE){

       double xpos, ypos;
       glfwGetCursorPos(window, &xpos, &ypos);
       mouseSpeed.p[0] = (xpos - mouseSpeed.p[0])  * .001;
       mouseSpeed.p[2] = (ypos -mouseSpeed.p[2])  * .001;

       SphereSpeed = mouseSpeed;

    }