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• position为 virtual_pos = glm::inverse(vrdriver->HMDPoseInverse * model)[3];
• forward为 virtual_forward  = -glm::inverse(vrdriver->HMDPoseInverse * model)[2];
• mat4 tmp = vrdriver->HMDPoseInverse;
• projection = vrdriver->GetHMDMatrixProjectionEye(vr::Hmd_Eye::Eye_Left, NEAR_PLANE, FAR_PLANE);
  eyeMat = vrdriver->GetHMDMatrixPoseEye(vr::Hmd_Eye::Eye_Left);
  view = eyeMat * tmp;

• 使用翻转代替teleportation ：if (vrdriver->press_button) {

                  frame_flag = 8;

                  model = glm::translate(glm::mat4(1.0f), glm::vec3(-camera_pos.x, 0.0f, -camera_pos.z)) * model;

                  model = glm::rotate(glm::mat4(1.0f), glm::radians(180.0f), glm::vec3(0.0f, 1.0f, 0.0f))* model;
                  model = glm::translate(glm::mat4(1.0f), glm::vec3(camera_pos.x, 0.0f, camera_pos.z)) * model;

                  /*model = glm::translate(model, glm::vec3(-camera_pos.x, 0.0f, -camera_pos.z));

                  model = glm::rotate(model, glm::radians(180.0f), glm::vec3(0.0f, 1.0f, 0.0f));
                  model = glm::translate(model, glm::vec3(camera_pos.x, 0.0f, camera_pos.z));*/

                  vrdriver->press_button = false;

              }

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