Ionic/Angular custom page transition

I'm working on an Ionic app that has a "preloader" immediately before the app starts. Ideally I'd like the main page after the pre-loader to appear immediately, instead of slide-in. Is there a way to programmatically define what transition to use on a one-off basis? Normally the sliding is fine, but just not for the transition from the pre-loader to the main menu.

Defining in controller $ionicViewSwitcher and $state

now in ng-click inside a or button tags call:

//here transition name
$ionicViewSwitcher.nextDirection('forward');
//here next state name
$state.go("main.map");