3D animation stereo space design is to process and analyze the collected target image information on the computer and finally obtain a 3D model that can represent the corresponding structure. As a branch of computer vision, 3D animation stereo space design is an important part of realizing the key technology of environment perception. What humans see in the three-dimensional world is a two-dimensional picture. Combined with the visual mechanism and the prior information of the object, it can realize the perception of the environment and promote the convenience of life and production. Games, movies, virtual humans, and any product that uses 3D technology require 3D engine support. The 3D engine encapsulates hardware operations and graphics algorithms and can manage a large number of texture and model resources to construct complex 3D scenes. In order to facilitate the research related to virtual human, in this paper, through the research and study of graphics-related mathematical knowledge and related technologies of engine architecture, an intelligent virtual animation generation engine based on DirectX12 is realized, and three-dimensional characters are controlled through related components, and the function of each module is tested and guaranteed. Test cases were designed to test the various functions of the engine and finally showed that the design goals in the demand analysis have been completed, and a lightweight three-dimensional animation three-dimensional space model has been realized.