A specialised head rig enables pixel light effects to capture highly detailed skin textures And facial blendshapes
Although Pixel Light Effects’ truck-based mobile photogrammetry rig provides photorealistic results, the company also offers another portable 32-camera rig devoted to capturing facial expressions and poses in motion, including FACS poses – intended to result in a facial animationready CG model.
The rig also takes advantage of crosspolarised lighting to completely cut specular reflections from the skin. This results in better textures and geometry detail and less surface noise in the photogrammetry process.
“Another benefit with a head rig,” adds Pixel Light Effects CEO, Jingyi Zhang, “is that the actor can comfortably sit in it for blendshape sessions. We also have a head stabiliser to minimise skull movements. Depending on the list of requests from a VFX studio, a session can vary from between 30 to 80 facial blendshapes, and take anywhere from 40 minutes to a couple of hours to complete.”
The result of a facial scan inside Agisoft Photoscan. The subject had marker dots placed on his face to help the feature tracking and animation.