该程序实现了图形学中经典的凹凸纹理映射算法。凹凸纹理映射是一种纹理混合方法，它可以创建三维物体复杂的纹理外观表面。普通的纹理映射只能模拟比较平滑的三维物体表面，难以显示表面高低起伏、凹凸不平的效果。凹凸纹理映射能够通过一张表示物体表面凹凸程度的高度图（称为凹凸纹理），对另一张表示物体表面环境映射的纹理图的纹理坐标进行相应的干扰，经过干扰的纹理坐标将应用于环境映射，从而产生凹凸不平的显示效果。-The program implementation of the graphics in the classic bump texture mapping algorithm. Bump texture mapping is a texture blending method, which can create three-dimensional objects the appearance of complex surface texture. Ordinary texture mapping can simulate three-dimensional objects relatively smooth surface, it is difficult to show that the surface of ups and downs, uneven results. Bump texture mapping can express through a convex surface of a high degree of plan [known as the bump texture], to another environment, said mapping surface texture map texture coordinates corresponding interference, through interference with texture coordinates will be applied to environment mapping, resulting in uneven display.
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