My company has recently taken the next step in going 3D by adopting AutoCAD MEP for our process, pump station, and wastewater treatment plant designs.
As we go down the rabbit hole more and more with MEP the similarities and dissimilarities with Civil 3D amaze me. For instance, both Civil 3D and MEP use Parametric Parts (Parts Builder), MVparts, modeled objects that control 2D objects (sections; profiles), etc… What I don’t understand is why Civil 3D doesn’t work more like MEP, knowing MEP was first. Why doesn’t it use Layer Keys; why does it not include the Parametric Part Wizard; why does it not include pressure pipe tools; why doesn’t it allow the use of MVparts as a substitute for Parametric Parts in a pipe network, etc…
Finally, why does it not use Display View Representations to control the display of objects? Well, in a way it does when you Xref AutoCAD MEP drawings into Civil 3D drawings. Learn more after the jump…
Below is an AutoCAD MEP drawing with walls, a pressure pipe, and an HVAC duct.
If you install the AutoCAD MEP Object Enabler into Civil 3D you can Xref the drawing directly, raise, and rotate the Xref into place on your site drawing. However, if you use the stock “AutoCAD Civil 3D (Imperial) NCS.dwt” template you will get the following.
As you can see there are a couple of problems (single line pipe and no walls)! The solution is to modify the MEP Display View Representation. To do this, type “DISPLAY” at the commend prompt and choose “S” for Sets.
You will be presented with the following dialog. Expand “Configurations” and select “Plan”. Then scroll down to the Pipes section and un-check the “1 Line” option and check the “2 Line” option.
Think of Display View Representations (DVR) as object Component sets. Whereas Civil 3D controls object Components through the styles, MEP uses DVRs which are selectable in model space and each viewport can be set to a different Display View Rep.
Next to the walls…
Select “Standard” and then the “Cut Plane” tab. There change the “Display Above Range” option to something above 400’ and then the “Cut Height” to 400’.
(The cut plane is the elevation your eye is slicing through the walls or building objects [not mechanical objects]. So, you may need to adjust a little depending on what you want to see [window or door locations].)
After clicking “OK” you should now see the following:
THAT’S IT!! …. but keep going for some more tips.
You can control more objects with the setting or have multiple Display View Representations (DVR). For example, if you never want to see HVAC objects when you Xref MEP drawings into Civil 3D you can simply turn them off in the Standard DVR – or create a copy of the Standard DVR – to avoid having to freeze the layers all the time.
Simply proceed back into the DVR control, scroll down to the “Duct” section and un-check both the 1 Line and 2 Line representations.
This goes the same for Windows, Doors, Cable Trays, etc…, etc…, etc…
Also note that Civil 3D objects show up in the DVR control!! Crazy…
(So, if you really want to mess with a co-worker go into their file and un-check all – or some – of the Civil 3D objects in the Standard DVR. They will remain in the file, still show in the Prospector, but won’t display in Model Space. )
As you can see, it seems like both softwares come from the same base code, but still work differently. It seems like Civil 3D could have incorporated DVRs, but doesn’t. That makes it possibly less complicated, but also less flexible. One thing that can be controlled through DVRs is object screening. Which would be a nice option in Civil 3D. I really wish it used Layer Keys – creates layers as you insert objects – and brought styles into the drawings as needed like MEP. But again, maybe that is easier said then done.
To give Civil 3D some credit, I wish in MEP you could adjust object elevation in Sections and have it change the model, like you can in Civil 3D with Profiles and the Section Editor. I wish Sections updated automatically like Profiles in C3D. Finally, I wish MEP object labels worked more like C3D labels.