Dynamic Blocks

Selecting Objects for Actions

When you add an action to a parameter, you must select objects to create a selection set for the action. Often, you want to select not only drawing geometry, but the parameter as
well. In fact, sometimes, you need to select other parameters on other objects to get the
results you want.
For example, let’s say that you have a desk with a linear parameter and a stretch action so that you can stretch the width of the desk. You want to be able to move the chair
independently (so it has a point parameter and a move action), but you also want it to
move to the right when you stretch the desk to the right. To accomplish this, when you
select objects for the desk’s stretch action, you need to include the chair and its point
parameter. Therefore, you need to create the parameter for the chair before you create
the stretch action for the desk. In general, if you want to include another object in an
action that has a parameter of its own, you should create the two parameters first, before
adding the first action.

A common use for including a second parameter in the selection set of an action is for a base parameter. Use a base parameter if you want the base point of the block reference
to remain in the same position relative to the block, for example, at the lower-left corner of
a rectangle, even when that position moves. If an action (such as stretch or move) moves
that lower-left corner, then you should include the base parameter in the selection set of
that action, along with its parameter. Then the base point of the block always remains in
its proper location when you edit the block in a drawing.


Specifying Stretch Frames

Stretch actions require you to specify a stretch frame before selecting objects. The
purpose of the stretch frame is not always obvious at first. This stretch frame specifies that
part of geometry that is included in the action. You can specify it with a selection or
crossing window. Then you can select objects with a crossing window or by picking the
objects. Often these two windows are similar (although they need to use slightly different
points). The following example shows the result of two different stretch frames while
stretching a rectangle in a drawing. In Figure 5, the stretch frame includes only the upperright
corner of a rectangle, so only that corner stretches. In Figure 6, the stretch frame
includes the entire right side so the entire side stretches.

What is CAD

Acronym for Computer Aided Design.

A CAD is a combination of hardware software that enables engineers and architects to design. It is the main geometry authoring tool within the Product Lifecycle Management process and involves both software and sometimes special-purpose hardware. Current packages range from 2D vector based drafting systems to 3D solid and surface modelers. Computer Aided Design allows you to produce diverse consumer products efficiently and effectively. You can obtain a degree from one of many accredited universities, colleges, or technical schools. You will take classes in design, computers, art, drafting, engineering, and architecture.

So, if you would like to combine your design experience with a high-tech career like Architectural Drafting or Mechanical Drafting, then you should explore your options in Computer-Aided Design.

CAD is not a product. There are a number of products available which supports CAD. But the basic CAD softwares that are used world-wide are Microstation & AutoCAD. Microstation is a product of Bentley & AutoCAD is of Autodesk.

I’ve been working on both the software since last 8years. Both the softwares are the best for the purpose they are made for.

For any kind of help on Microstation & AutoCAD, send your comments. I'll try my level best to solve it.

Asish Mallick