Research on Building Effect Design System Based on Computer 3D Image Processing Technology

In this paper, 3D image data obtained by Autodesk Map 3D flatbed scanning system was used to automatically extract point cloud data and conduct point cloud modeling. Firstly, this paper proposes a contour rendering method based on elevation cloud image of data points to extract control points from the whole cloud image region. Then this paper uses the OpenGL graphics library provides rich graphics program interface. According to the principle of minimum distance and maximum Angle, a triangulation irregular network (TIN) model is established. Then, the elevation of data points and color RGB values are corresponded one by one to generate the elevation cloud map of data points. The experimental simulation analysis shows that the application of this method expands the search range of control points and increases the number of control points. In this way, the linearity of the contour map is better and more consistent with the actual terrain.