The reason why displacement mapping is much more expensive than bump mapping is because bump mapping is applied later in the rasterization process, as a per-fragment operation. Since displacement mapping has to actually change the geometry, it is a per-vertex operation. To get any semblance of detail, there must therefore be lots of vertices, which is expensive
-Kevin
The reason why displacement mapping is much more expensive than bump mapping is because bump mapping is applied later in the rasterization process, as a per-fragment operation. Since displacement mapping has to actually change the geometry, it is a per-vertex operation. To get any semblance of detail, there must therefore be lots of vertices, which is expensive -Kevin