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词汇 Bump Map
分类 英语词汇 英语翻译词典
释义

Bump Map

中文百科

凹凸贴图 Bump mapping

（重定向自Bump Map）
不带凹凸贴图的球体;下图所用的凸凹纹理;这个使用凹凸贴图的球体几何上与上面的球体一模一样，这改变了球体的浓淡效果，使它看起来像一个橙。

凹凸贴图（bump mapping），又称为皱面贴图，是一项计算机图形学技术，在这项技术中每个待渲染的像素在计算照明之前都要加上一个从高度图中找到的扰动。这样得到的结果表面表现更加丰富、细致，更加接近物体在自然界本身的模样。法线贴图是一项常用的凹凸贴图技术，另外还有许多其它的实现技术，如视差映射等等。

英语百科

Bump mapping 凹凸贴图

（重定向自Bump Map）
A sphere without bump mapping (left). A bump map to be applied to the sphere (middle). The sphere with the bump map applied (right) appears to have a mottled surface resembling an orange. Bump maps achieve this effect by changing how an illuminated surface reacts to light without actually modifying the size or shape of the surface.
Bump mapping is limited in that it does not actually modify the shape of the underlying object. On the left, a mathematical function defining a bump map simulates a crumbling surface on a sphere, but the object's outline and shadow remain those of a perfect sphere. On the right, the same function is used to modify the surface of a sphere by generating an isosurface. This actually models a sphere with a bumpy surface with the result that both its outline and its shadow are rendered realistically.

Bump mapping is a technique in computer graphics for simulating bumps and wrinkles on the surface of an object. This is achieved by perturbing the surface normals of the object and using the perturbed normal during lighting calculations. The result is an apparently bumpy surface rather than a smooth surface although the surface of the underlying object is not actually changed. Bump mapping was introduced by James Blinn in 1978.
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