传统的体纹理绘制方法采用函数模型定义体纹理空间的颜色,模拟不同的纹理特征需要反复调整与测试相关参数,且在多数情况下不能获得令人满意的结果.以木材体纹理绘制为例,提出了一种基于样图的体纹理绘制新方法.该方法针对木材纹理的结构特点构造样图空间与体纹理空间的几何映射关系,采用木纹样图的像素纹理值定义体纹理空间的颜色.实验结果表明,绘制的纹理不仅较好地模拟了木纹样图中的纹理特征,而且在物体各表面交界处保持连续.由于纹理样图可根据用户需要任意选取,基于样图的体纹理绘制方法显著提高了计算机生成木纹的真实感与多样性.

The color of solid texture space is defined traditionally through a function model.To simulate different texture details,the relevant parameters need to be modified and tested repeatedly,however good results could rarely be acquired.A new method of solid texturing based on specimens is proposed in the paper.We establish geometrical mappings between the specimen space and solid texture space according to the structure characteristic of wood texture,and define the color of solid texture space using the texture value of specimen pixels.The results from our experiments show that the wood texture produced by this method successfully represents realistic texture details on the specimens and is continuous between the conterminous surfaces of objects.As the wood specimens may be selected according to user's requirements,solid texturing based on specimens is a superior technique which could evidently promote the quality and the variety of wood texturing.