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Understanding Geometric Constraint

December 6, 2009 in AutoCAD, CAD, Revit

parametric features
Finally, Autodesk add parametric features in AutoCAD 2010. Why finally? This feature is already there in manufacturing industry for decades. If you have used any manufacturing application like Inventor, CATIA, SolidWorks, ProE, etc, then you should be already familiar with this feature.
There are 3 panels in parametric tab: geometric, dimensional, and manage. Let’s talk about geometric first.
Geometric constraint will maintain how your objects related to each other. Let’s see this example.
Let’s say we have a rectangle. We know that the sides have to be perpendicular to each other. But sometimes during the design, you may need to change it. If I stretch one of the rectangle vertex, then it would not be a rectangle anymore. AutoCAD doesn’t know that you want to keep it as a rectangle.
stretch vertex

We can prevent this by telling AutoCAD that we want them always perpendicular to each other. We can add perpendicular constraint. So I add a perpendicular constraint to the two sides. I try to stretch the vertex again.
1 perpendicular constraint
As you can see, the two sides are kept to be perpendicular to each other. But the other edges don’t. We have to add all constraint to keep it a rectangular.
all perpendicular
That’s the concept.
I don’t know if this gives many advantages to AEC industy or or. I know that MicroStation has this feature years ago, but it’s not become a popular feature. Maybe because Bentley Systems doesn’t have solutions in manufacturing industry.
There are some use that I can think of: in dynamic block. But I’m not sure if we can use it extensively in drafting. I saw the example in new features workshop, the sample is for manufacturing, not AEC. Do you have any idea, where we can use it in AEC industry? I will try to post some dynamic blocks using this parametric feature, and maybe you can suggest me how we can use it in drawings.

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Source: CAD Notes – Understanding Geometric Constraint
Go to Source: CAD Notes


Recognizing Features

September 11, 2009 in CAD, Kubotek

Someone pointed out to me today a list of academic papers on feature recognition dating from 1988 (http://asudesign.eas.asu.edu/projects/geofearegres.html). It is interesting to consider the early work done with geometric models and other directions mainstream modeling might have gone if more interest was paid to these ideas back then. It seems that most of this work with feature recognition was in the context of automating the creation of or feeding parameterized construction history trees which was the popular trend in 3D design at that time. Secondly feature recognition was widely seen as a benefit for generating parameterized machining operation lists.
To me a central part of Kubotek’s novel idea that has sparked the CAD industry’s recent trend toward geometry-based modeling is that the largest benefit of feature recognition is not in the automation of design. Like other projects from the late 80s and early 90s, Kubotek’s software can find patterns of geometric faces and in appropriate cases create parameterized features from them. What is different is that Kubotek software knows that one view of the features is only useful for some of the users of the geometry. Whether original construction steps or recognized from geometry, features are not the central definition of the model, they are always disposable.
This outlook on features prevents Kubotek software from locking designs down to just one user’s view of the features. This translates into valuable design freedom and agility. There certainly are occasions in which design can be locked down and automated but more often difficult problems require constant adaptation to insights gained as the project progresses. Besides does locked down and automated sound like any fun to you?

Source: CAD Freedom and Precision – Views and News from KubotekUSA – Recognizing Features
Go to Source: CAD Freedom and Precision – Views and News from KubotekUSA

SolidWorks 2010 tune-up

August 26, 2009 in CAD, SolidWorks

There’s something different about SolidWorks 2010.  It’s hard to put my finger on it.  It just seems to be a little …oh I don’t know… snappier or peppier.   That’s strange.   I mean, there are obvious improvements in such areas as user interface, reliability and predictable feature results, but there’s something else.

Well, I lie, I know exactly [...]

Source: SolidWorks Legion – SolidWorks 2010 tune-up
Go to Source: SolidWorks Legion

Map3D 2010 "What’s new?"

August 5, 2009 in AutoCAD, CAD

The new version is on it’s way to a desk near you. So lets look what is new. First it has all the features of AutoCAD 2010, that includes the new freeform modeling tools and the parametric tools. Using them in a Map/GIS environment is another story but if you want to “design” 3D models you can.

The first thing you may notice is Map3D 2010 is ribbon based with two new workspaces. A tool base ribbon and a task based ribbon.

Ribbon2

Now if you have not used the ribbons in any other application or used them in AutoCAD before it takes a little extra work to get used to them over menu driven interfaces. The big change to these in 2010 version is a new context-sensitive ribbon.

Ribbon

With the context-sensitivity ribbons a new tab will display depending on the object(s) you may have selected. It makes it easier with most of the tools/commands right there instead of trying to hunt down the location on the ribbon.

Next item you may notice is the Survey tab on the task pane.

SurveyTab 

The Survey Extension from 2009 is now part of the task pane and allows you to import survey points from a number of different ASCII point data files and supports LandXML data. You will be able to import points and create different point groups from the data based on the attributes. 

The next new feature is creating an overlay with feature data. Prior to this if we needed to do an overlay it had to be with standard AutoCAD objects then  create a topology, which always took some drawing cleanup to complete a correct topology. Now users can do 7 different types of overlays with data from FDO sources.

OverLays

With the new overlay feature and the existing buffer feature Map3D users can do just about any type of analysis they need to on a regular day to day operation.

Speaking of day to day operations, the next new feature may be of use. The new Windows Work Flow Framework may be an answer to all those repetitive tasks.

WorkFlow

Any one that tried to use the Macro-recorder in 2009 found out that it did not work with FDO features, this not only works on FDO but use the Window Workflow Foundation to include tasks or activities that can be done outside AutoCAD. So far there is little documentation on using it but the nerds that like to get under the hood and tinker should be able to get some nice little activities created with it.

Another new feature is one that a lot of CAD users have been wishing for since the data connect days. A simple way to view the attributes from the connected features with out opening the data tables.  It’s included in the property palette now. That’s right, instead of getting just “Mapbulkfeature” in the property palette when you have a feature selected you get all the attributes with that feature.

properties

Not only is it viewable you can edit the values also. Select multiple features and change the attributes value at one time is now a possible task.

Those are a few of the new features that a lot of users can take to the boss and say it was worth the upgrade. A few others improvements are the bulk copy has been enhanced and improved on, a few new options with the COGO tools, a couple new data providers, a better raster reprojection, support for 64 bit systems and Citrix XenApp 5.0. The last new feature I will post about it the Geographic location tool. In 2009 version you most likely seen the GeoMarker or what some call the “wagon wheel” or “pizza” when you assigned a coordinate system to your map. That is a standard AutoCAD feature the allows non-map users to get a geographical location  from a number of places like Google Earth or just by entering a Lat/Lon, well now we can use that location to insert the drawings into our map with out having to move or scale it. In other words if you get a drawing of a building from an standard AutoCAD user and they provided the geo location in the drawing then when we bring that building into our map it falls right into place instead of at 0,0,0.

Source: Map 3D and Murphs Law – Map3D 2010 "What’s new?"
Go to Source: Map 3D and Murphs Law

How to use Negative Distances in your Geospatial Buffer Analysis

August 4, 2009 in AutoCAD, CAD

Geospatial buffer analysis involves generating a polygon at a specified distance from a proposed feature to determine proximity. For example, a 100m buffer around a point feature creates a circle with a 100m radius. Similarly, a 50m buffer around a polygon feature creates a larger polygon – a polygon that encompasses the source feature.

However, did you know that you can also use a negative distance to create a buffer? That’s right! When you use a negative distance, such as -25m, to buffer a polygon feature, the result is a smaller polygon – a polygon that is inside the source feature.

Consider the following example where the objective is to determine the area of shoreline habitat available for a certain species of wildlife. The species in question has been observed not to forage beyond 100m from shore and includes a riparian buffer of 25m as part of its habitat. To compute the total area of habitat available to this species requires the creation of two buffers and a polygon overlay operation. The first buffer (ie BufferOutside25) is created at a distance of +25m and represents the riparian buffer. The second buffer (ie BufferInside100) is created at a distance of -100m and represents the forage extent. A polygon overlay analysis of type subtract is then used to determine the zone of available habitat where:

HabitatZone = BufferOutside25 – BufferInside100

The total area of habitat available is equal to the area of the zone of available habitat (ie HabitatZone).

Check out the video to see the process in action with AutoCAD Map 3D.

Source: geoExpressions – How to use Negative Distances in your Geospatial Buffer Analysis
Go to Source: geoExpressions

Conditional suppression

August 4, 2009 in AutoCAD, CAD

AutoCAD Tips and Tricks

If you’ve ever wanted to suppress a feature if a parameter reached a specific value, there is a great way to do this at the feature level. To see how this is done, I will  create a rectangular extrusion with a shell on it that has a condition to suppress the shell if the size [...]

Source: All About CAD – Conditional suppression
Go to Source: All About CAD

3ds Max 2010: Containers

July 23, 2009 in AutoCAD, CAD

3ds Max 2010

Hey all.  Sorry for the loooong delay in posts.  I really don’t have an excuse, so I’ll just get into this post.  Last week I taught the new feature in 3ds Max 2010 called containers.  I really like this new feature but I’m not sure if I agree that much with it’s implementation.  Containers, I [...]

Source: All About CAD – 3ds Max 2010: Containers
Go to Source: All About CAD

And the June SW Legion Contest winner is… (Part 2)

July 15, 2009 in CAD, SolidWorks

There are two winners for the June SW Legion Contest.  The official winner (Sandeep Pawar) and the unofficial winner (per the unstated and unofficial though originally intended rules) is Arash Erfanian.   Three individuals produced verifiable scalene ellipsoids with only three elements.  One individual used two sketches and one feature (3 elements total).  Two other individuals used …

Source: SolidWorks Legion – And the June SW Legion Contest winner is… (Part 2)
Go to Source: SolidWorks Legion