Bringing Warcraft to the big screen requires a cast of orcs and other gigantic creatures — which you can’t find via run-of-the-mill auditions and casting notices. That’s where visual effects come in, and a new featurette for the film highlights the work done for the video game adaptation.

“Warcraft is a huge-scale movie — this is really the high-wire act of studio filmmaking,” said director Duncan Jones in the clip. Thankfully, he adds, they had ILM, the “tyrannosaur of CG work,” to help bring the story to life.

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The video illustrates how ILM’s team created those motion-capture characters, including breaking what they called new ground in their work on the orcs’ faces, as well as another important feature: their hair. For that, custom software dubbed HairCraft was created specifically to get their looks just right.

Check out all that work in the video below. Warcraft hits theaters on June 10.

  • Video Games