VUDU has announced they will be adding support for Chromecast to their service enabling casting from Android, iOS, PCs and Macs. According to their blog post, support for VUDU on Chromecast will be enabled via the Chrome browser on computers while the mobile device apps will be updated to add the capability.
VUDU says they are currently accepting registrations for people who want to be part of the beta testing program for the new feature. It does require a new sign-up separate from a user’s regular VUDU account. You can hit the source link for instructions on how to sign up if you are interested.