法线式凹凸映射在分块纹理映射中的应用

Application of Bump Texture Mapping in Block Mapping

随着"数字化人"的研究,人体器官模型的建立需要越来越丰富的信息,凹凸纹理映射技术可以使数字化模型更加真实和生动。在基于分块映射方法的基础上,采用法线式凹凸纹理映射的方法,通过归一化模型表面法向量,计算纹理坐标的偏移量并添加到纹理坐标,将其投影到切空间中实现了对模型表面法向量的扰动,完成了生物器官模型表面的凹凸纹理映射,进一步改善了数字化器官模型的可视化效果,提高了器官模型的真实感。

With the progresses of the research on ＂Digital Human＂, more and more information has been needed for the setting up of the three-dimensional digital models of human organs. In the present paper, based on the method of block mapping with a normal-style bump mapping method, we normalized the vector of the surface of the models, computed offset of the texture coordinates and added to them. The projection of the coordinates to the tangential space complemented the disturbance to the vector of models＇ surface. The method was proposed with bump texture mapping on the surface of the biological models of organs to improve the impression of the visualization of the organ models and to enhance the sense of reality of the models.