最著名的噪声函数法就是K en Perlin于20世纪80年代提出的Perlin噪声,它被广泛应用于真实物体的模拟。文章采用Perlin噪声方法来模拟破旧木纹的效果,发现采用一维、二维噪声合成的方法可以产生特别的效果;另外,通过加入几何映射,可使效...最著名的噪声函数法就是K en Perlin于20世纪80年代提出的Perlin噪声,它被广泛应用于真实物体的模拟。文章采用Perlin噪声方法来模拟破旧木纹的效果,发现采用一维、二维噪声合成的方法可以产生特别的效果;另外,通过加入几何映射,可使效果更加显著。展开更多
Bump mapping is a texture-based rendering approach for simulating surface details to make its illumination results have three-dimensional effects. The bumpy properties of an object are determined by height maps. But i...Bump mapping is a texture-based rendering approach for simulating surface details to make its illumination results have three-dimensional effects. The bumpy properties of an object are determined by height maps. But in the process of generating height maps, a problem arises, i.e. to get a correct value of the pixel height, empirical data should be calculated repeatedly, which proves very complicated, and meanwhile the realistic rendering effect is reduced, because the bumpy property is exaggerated in the height map. Therefore, in this paper, we present a method for describing the details of the bumpy texture, where a new concept ＂bumpy map＂ is introduced to replace the height map. Experimental results demonstrate that the bumpy details produced by the ＂bumpy map＂ are more consistent with the original bumpy texture than by the method of height map.展开更多
基金Supported partially by the National Natural Science Foundation of China (Grant Nos. 60533030, 60825203, 60572104)National High-Tech Re-search & Development Program of China (Grant No.2006AA01Z317)Science and Technology Development Program of Education Commission in Beijing (Grant No. KM200710005017)
文摘Bump mapping is a texture-based rendering approach for simulating surface details to make its illumination results have three-dimensional effects. The bumpy properties of an object are determined by height maps. But in the process of generating height maps, a problem arises, i.e. to get a correct value of the pixel height, empirical data should be calculated repeatedly, which proves very complicated, and meanwhile the realistic rendering effect is reduced, because the bumpy property is exaggerated in the height map. Therefore, in this paper, we present a method for describing the details of the bumpy texture, where a new concept ＂bumpy map＂ is introduced to replace the height map. Experimental results demonstrate that the bumpy details produced by the ＂bumpy map＂ are more consistent with the original bumpy texture than by the method of height map.
