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glOrtho(-w / 2, w / 2, -h / 2, h / 2, -1000000.0, 100000.0);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
glPushMatrix();
gluLookAt(m_pCam->m_target.x, m_pCam->m_target.y, m_pCam->m_target.z,
0.0f, 0.0f, 0.0f,
m_pCam->m_up.x, m_pCam->m_up.y, m_pCam->m_up.z);
// main picture show
glPushMatrix();
glTranslatef(m_pCam->m_position.x,
m_pCam->m_position.y,
m_pCam->m_position.z);
glScaled(m_pCam->GetScale(), m_pCam->GetScale(), m_pCam->GetScale());