一种新的累加自动地形生成方法*

提出了一种新的基于分形的累加自动地形生成方法，首先引入断裂形成算法作为地形高度生成器的初始模型，通过控制幅度和迭代次数，生成形态各异的地形轮廓，然后从分形理论fBM数学模型出发，使用中点位移法对初始模型进行迭代处理，生成丰富的地形细节。该方法的主要优点是自动性和可控性的结合，一方面通过设置断裂形成算法的参数可以自动生成特征模板，另一方面通过控制分形参数，生成任意层次的地形细节。实验表明，使用该方法可以生成真实感较强的地形，该方法是可行且有效的。

New accumulated method for automatic terrain generation

Based on the fractal, an accumulated method for automatical terrain generation was proposed. The Fault formation is considered as the generator of feature height of terrain. By controlling the iterations and amplitude of Fault formation, we can get diversified Contoured Terrain. Then the MPD(Middle Point Displacement) method of fractal theory which is based on fBM is used to iterate the initial model, which results in more terrain detail. The main advantage of the method is the combination of automaticity and controllability. On one hand, Terrain Feature Templates can be automatically generated with various parameter`s value of Fault formation. On the other, arbitary level detail can be produced with various Fractal parameter`s value. The experiments prove that our method is feasible and valid ,and realistic terrain can be generated.