说明：  地形高度图制作工具，做出来的图片一般都是128x128或者256x256的,Ogre里需要的高度图是2的N次方+1的灰度图,所以需要用PS更改大小和图片模式
(Terrain height map production tool, do so out of the picture are generally 128x128 or 256x256 in, Ogre needed height map is 2 N-th power+ 1 of the grayscale, so need to use PS to change the size and picture mode)