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Zheng, Lei 2018-01-12 11:43:20 +08:00
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@ -455,7 +455,8 @@ view, and you can create a constraint, regardless how many levels of
hierarchies in-between. All intermediate `Elements` and `ElementLinks` will be
created automatically. Although, for the sake of re-usability, it is best for
the user as an assembly author to explicitly create `Element` as interfaces,
and give them proper names for easy (re)assembling.
and give them proper names for easy (re)assembling. Check the [section](#replace-sub-assembly)
below for a demonstration of part replacement.
Last but not the least, `Element`, as well as the `ElementLink` inside
a constraint, make use of a new core feature, `OnTopWhenSelected`, to
@ -742,6 +743,35 @@ recomputation by holding `CTRL` key while dragging.
![Screencast3](https://github.com/realthunder/files/blob/master/screencast/asm3/asm3.gif)
### Replace Sub-Assembly
Continue from the Multi-join assembly we created in previous section. Suppose
we want to change the sub-assembly with another part. The screencast below
shows how to do it.
![Screencast3](https://github.com/realthunder/files/blob/master/screencast/asm3/asm-replace-part.gif)
All geometry element references used in any constraints will be referenced
through some auto created `Element` object. Find out those elements, and give
them some meaningful name. When you rename some `Element` object that are
referenced by some constraint, or high level `Element` objects, all involved
subname references will be automatically updated. Be careful, though. If you are
editing an external assembly that are referenced in some other super assembly
file that are not currently opened in FreeCAD, you will obviously break the link
reference.
Now, to replace the sub-assembly, manually create the corresponding elements
with selection, drag and drop, and give them the same names. Because the
original sub-assembly is brought in by a `Link` object, simply re-point the
`Link` to the replacement part, and re-solve the constraint system. Done!
Note that, in the screencast, we didn't rename the first two elements. It is
because that those elements are used internally by the original sub-assembly. It
is not involved in the parent assembly. If you modified the geometry model of
the sub-assembly, then you should double check all the elements for any geometry
topological name changes.
### Import External Assembly
In some cases, it will be easier to distribute your multi-hierarchy assembly as