Acta Geodaetica et Cartographica Sinica ›› 2025, Vol. 54 ›› Issue (4): 736-748.doi: 10.11947/j.AGCS.2025.20240257

• Photogrammetry and Remote Sensing • Previous Articles    

Close-range photogrammetric differential rendering using geometry buffer for the material reconstruction of non-lambertian surface model

Han HU1(), Xiaolin GUO1, Lang XIONG1, Xuming GE1(), Haowei ZENG2, Qing ZHU1   

  1. 1.Faculty of Geosciences and Engineering, Southwest Jiaotong University, Chengdu 611756, China
    2.Chengdu Institute of Survey & Investigation, Chengdu 610023, China
  • Received:2024-06-25 Published:2025-05-30
  • Contact: Xuming GE E-mail:han.hu@swjtu.edu.cn;xuming.ge@swjtu.edu.cn
  • About author:HU Han (1988—), male, PhD, professor, PhD supervisor, majors in oblique photogrammetry and 3D GIS. E-mail: han.hu@swjtu.edu.cn
  • Supported by:
    The National Key Research and Development Program of China(2022YFF0904400);The National Natural Science Foundation of China(42071355);The Sichuan Science and Technology Fund for Distinguished Young Scholars(22JCQN0110);The Natural Science Foundation of Sichuan Province(2024NSFSC0785)

Abstract:

The optical texture material of non-lambertian artifacts such as porcelain is a critical foundation for the realistic visualization and rendering of 3D models. Due to the color differences such as highlights caused by non-lambertian surfaces from different viewing angles, existing photogrammetric texture reconstruction methods crudely alleviate these color differences through color equalization and feathering; Neural radiance field methods based on implicit spatial representation rely solely on multi-layer perceptron to blur spatial fitting for different reflection directions, leading to insufficient realism. Therefore, this study proposes a differentiable rendering method for non-lambertian material reconstruction using close-range photogrammetry geometry images. By employing a handheld stereo scanner and controlled lighting conditions, the method accurately acquires oriented parameters, model geometry, and initial color texture of images. Material properties such as albedo, roughness, and normal perturbation are treated as planar tensors to be optimized, mapped to screen space via rasterization to obtain rich geometric images with coordinates, normal, texture coordinates, and material attributes; Drawing on deferred shading techniques, the geometric image simulates pixel shaders in screen space, achieving differentiable rendering and inverse feedback optimization of unknown material information using the Cook-Torrance microfacet model for highlights. Experimental results on typical non-lambertian targets demonstrate that the proposed method achieves a structural similarity index (SSIM) better than 0.85 compared to real images, improving rendering accuracy by 8.7% and 7.2% over 3D Gaussian points and multi-resolution hash encoding based on implicit space representation, respectively, significantly enhancing the realism of the model.

Key words: close-range photogrammetry, non-lambertian material, geometry image, deferred shading, differentiable r endering

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