Lead Matte Painter at Weta Digital Jean-Baptiste Verdier has presented 3D Rock Collection, a brand new asset pack designed to greatly simplify your concept art and environment art workflows. The collection contains eleven lightweight rock assets made procedurally in Houdini and rendered in Blender that can be easily kitbashed together to get interesting shapes and build 3D environments. According to the pack's description, the assets are optimized for Maya, Clarisse, Unreal Engine, Blender, and all the major 3D packages and can be used for both commercial and personal projects.
