view portalview
{
layer = -1;
flags = visible;
arc = 60;
}

action levelportal
{
portalview.bmap = bmap_for_entity(my,0);
vec_set(portalview.x, nullvector); // set the view positions here
vec_set(portalview.pan, nullvector); // set the view angles here
}

Here you´ve something to fiddle around. It works also on deformed models. I´ve used a 512*512 skin size (resize the skin in MED) but I haven´t used a skin at all. You could make the view transparent and use a skin to create a nice effect.

no science involved