 According to Pixomondo VFX Supervisor Matthew Welford, the team recreated a fully CG rock wall made up of thousands of individual rocks, mud, plates and debris.FX simulation was used to accurately recreate how those rocks – which had been scanned earlier – would actually roll down the hillside.It was necessary to make sure the rocks interacted with both the world around them, and actors within the scene, to make the final shots feel as realistic as possible.