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| Re:Foral的Blog----陆续更新 [精华] |
槲栎
发贴: 395 
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 2009-01-19 11:02 
      grasshopper在wiki上的解释。 Rhino4 came with a basic history feature build-in, which is a non-intrusive layer around the workflow that allows for automatic updates of certain modeling steps. The current implementation of History in Rhino4 is implicit, that is: it is recorded as you go. This means there is no additional overhead required at model-time which is exactly the sort of thing we would like to see in Rhino: more features, no additional limitations. However, implicit history cannot do some things which are possible with explicitly defined history. First of all, the history tree is hidden from the user. The behaviour of the different history stages cannot be adjusted. For example, there is only one chance to set the properties of a history based Loft. Once the surface exists, the only way to change the Loft settings is to recreate the surface. This will break all downstream history records and is thus potentially an extremely expensive limitation. It is also impossible to add or replace curves from a history Loft. 说明grasshopper的关键之处或者说所谓参数化设计软件的关键之处就是要有explicit defined history。因为一般的建模软件如sketchup他们的history tree 都是hidden from user。所以掌握一些编程的技巧，sketchup也可以实现（部分）参数化设计的功能的。just programming。 |
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