+ // check if an exhibit is hovered-over by mouse or 6dof
+ // XXX note: using previous view/proj matrix lattency shouldn't be an issue but
+ // make sure state-creep doesn't get us
+ // XXX also this mouse-picking probably should only be active in non-VR mode
+ Ray ray = calc_pick_ray(prev_mx, prev_my);
+ exsel_hover = exman->select(ray);
+