static void myRotateUpDown( ON_Viewport& viewport, double angle )
{
// rotates camera around the screen x axis
ON_3dVector camX;
ON_3dPoint center;
if ( glb_model )
center = glb_model->m_view.m_target;
else
viewport.GetFrustumCenter( center );
viewport.GetCameraFrame( NULL, camX, NULL, NULL );
myRotateView( viewport, camX, center, angle );
}
static void myRotateLeftRight( ON_Viewport& viewport, double angle )
{
// ON_3dVector axis = ON_zaxis; // rotate camera about world z axis (z up feel)
ON_3dVector axis = ON_zaxis; // rotate camera about world y axis (u up feel)
ON_3dPoint center;
if ( glb_model )
center = glb_model->m_view.m_target;
else
viewport.GetFrustumCenter( center );
myRotateView( viewport, axis, center, angle );
}