Matt Mirandi sends this info on the special effects used in Mama (written up by Mike Olson). Matt says: "I wanted to point you to this feature from The Credits—a digital mag that highlights Hollywood’s less heralded makers). Really, really creepy video of Mama VFX performer, Aaron Weintraub performing a movement test in a warehouse somewhere. Beyond that the piece has the interesting backstory about the pains that the crew went to achieve Mama’s water-logged hair throughout the process (and blending the real and the CGI).
Read the full article, Mommy Issues: Making Monsters with Mama.Here's an excerpt from the article:
...But Muschietti, who also co-wrote the script, was blessed with more than a green light from executive producer Guillermo del Toro. He also owes much of his success to visual effects supervisor Aaron Weintraub and Javier Botet, the French contortionist who brought Mama to (after)life.
Take Andy Serkis, stretch him to seven feet tall and give him flexibility straight out of Cirque de Soleil and you have the actor who plays Mama’s titular character. “He’s very frail and can get his body into all these weird positions,” says Weintraub of Botet, and it is those contortions that serve as a physical manifestation of Mama’s tortured past, as well as the present-day horrors she’ll visit upon anyone who gets close to the “daughters” she’s adopted.Thanks Matt.