CAJ | 학술논문

线状模型是虚拟三维场景中的重要模型，其精细程度直接影响着虚拟场景的视觉效果。制作线状模型的常用方法分为整体模型法和分段拼接法，对于弯曲程度较大的线状模型，使用整体模型法制作时难以控制顶点坐标和纹理贴图，而采用分段拼接法又会在转弯处产生模型空隙和纹理重叠，导致模型失真。该文提出了一种针对大曲率线状实体的三维可视化方法，在几何模型制作阶段，根据路径和截面数据直接计算模型顶点坐标、法向量和索引数据，实现放样建模；在纹理贴图阶段，通过建立模型顶点与纹理图片像素的映射关系，实现模型贴图。结果表明，该算法可应用于铁路路基等大曲率线状模型的制作，具有精度可靠、人工交互少及可视化效果好的特点。
선상모형시허의삼유장경중적중요모형，기정세정도직접영향착허의장경적시각효과。제작선상모형적상용방법분위정체모형법화분단병접법，대우만곡정도교대적선상모형，사용정체모형법제작시난이공제정점좌표화문리첩도，이채용분단병접법우회재전만처산생모형공극화문리중첩，도치모형실진。해문제출료일충침대대곡솔선상실체적삼유가시화방법，재궤하모형제작계단，근거로경화절면수거직접계산모형정점좌표、법향량화색인수거，실현방양건모；재문리첩도계단，통과건립모형정점여문리도편상소적영사관계，실현모형첩도。결과표명，해산법가응용우철로로기등대곡솔선상모형적제작，구유정도가고、인공교호소급가시화효과호적특점。
The linear model is among the vital models in 3D visual scene, and its degree of fineness determines the visual effect of the scene. Common methods for constructing linear models can be divided into integral model method and spliced model method;nevertheless, for large-curvature linear models, neither method is ideal. The vertex coordinates and texture mapping are difficult to control when the integral model method is employed, and space between models and texture overlaps is inevitable when the other methods are used. A 3D visualization method for high-curvature linear entity is proposed in this paper. In the phase of geometric modeling, the vertex coordinates, normal vectors and index data are calculated for model lofting based on path and cross section. In the phase of texture mapping, textures are made by creating a mapping between vertices on the model and pixels on the photo. The results show that the algorithm can be utilized to make large -curvature linear models like railway roadbed models, and the algorithm has the merits of high accuracy, requirement of less manual work and good visual effect.