The systematic analysis and reconstruction of the grinding painting technique promotes the digital development of lacquer painting art. This paper analyzes the structural characteristics of the mill painting technique, combines the modeling needs of regular and irregular structures, and chooses the stacking modeling method to complete the construction of the lacquer painting model. Key elements such as the superposition of lacquer layers are constructed in layers, and the visual realism of the lacquer painting model is enhanced by lighting, material and rendering techniques. For the point cloud data generated by high-precision scanning, KD tree denoising and octree downsampling algorithms are used to optimize the data quality and ensure the accurate reproduction of model details. The results show that the parameter combination of sampling points, ρ and γ is (123,500,1.2,0.10), and the deviation rate is only 4.3% while the coverage area reaches 5.597. In this paper, the stacked modeling method takes only 0.52 days to complete the 3D modeling of lacquer paintings. The modeling fidelity in all four structural features of the abrasive painting technique exceeds 95%, and the cost reduction is greater than 40% in all of them. Eight volunteers gave a score of 80 or more for the application of the 3D lacquer painting technique.
