总算弄懂了：
其实就是为了在以后（不管是JOINT还是EXTRACT之后），选择那些曲面或曲线会很方便的。比如：在joint了多个元素并用FEDERATION其中几个元素后，则只要选择federation中的其中一个元素，其余的都会选上。看看下面的英文介绍，虽然没有图（抱歉），但是应该能理解。
Federation is grouping elements like surfaces and curves in a Join for easy picking of surfaces/curve later. Federation can be found in “Join” and “Extract” command in CATIA V5 GSD(Generative Shape Design) Workbench. This is useful grouping feature. We shall explain you what is it and how to use it.
Consider a set of simple surfaces as shown in the image below. The Geometrical set consists of 4 surfaces.
Surface 1, Surface 2, Surface 3 and Surface 4 is included in ‘Join.1’. In the Federation tab of join command we have added Surface 4 and Surface 3 as shown in the image below.
Join.1 with ‘F’ is reflected in the Join command icon in the model tree.
For comparison, we have created a simple ‘Join.2’ without Federation. ‘Join.2’ is join of Surface 1, Surface 2, Surface 3 and Surface 4.
‘Extract’ command on ‘Join.2’ gives 4 elements selection (refer image below).
Where as ‘Extract’ on ‘Join.1’ gives only 3 elements. That’s because Join.1 involves Federation of two surfaces. Those two surfaces are grouped together.
This way in a complex geometry you can group several surfaces and involve it in a Federation. Later selecting of those surfaces is very simple and will happen in a single click.
发表于 2004-12-21 23:53:02
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发表于 2004-12-22 21:14:25
