This paper reports on the development of a fast 3D shape scanner that can output 3D video at 250 fps using two high-frame-rate camera-projector systems with an implementation of 10-bit Gray code light pattern encoded in both horizontal and vertical. The 3D data, which is extracted by the two camera-projector systems and accelerated by installing a GPU board for parallel processing of structured light illumination, are registered together to obtain an entire shape. To avoid the interference of projection patterns, the high-speed vision platform used in this paper is dedicated and improved for dual-camera frame-straddling by developing a hardware logics for the time delay control between the two cameras, while the two projectors are synchronized with the two cameras using impulse signal. The effectiveness is demonstrated through several 3-D shape measurements when several moving objects and static objects are observed by the proposed scanner.