Dimensioning to them is much easier than the paperspace w/ viewports method, and they don’t randomly jump around when you edit or move parts in the model (they look really good too). When annotating 3D models, I’ll dimension in paperspace using the baseview objects and they’ve been great. For me, speeds up layout, makes the drawing more flexible, and is generally quicker to revise. When drafting in 2D (schematic, structural, arch, simple mechanics) I’ll dimension in modelspace. The one thing we don’t do anymore is use 1 dimension scale, and scale the actual drawings in modelspace those were dark days, and I hope to never see the like again. I’ve rolled the annotative styles into our standard templates, and everyone is doing well with them after a little initial training. I personally use annotative because it lets me use six standard dimension styles to control the formatting of the dimensions (units, precision, visual representation, etc) instead of having a style for each scale and manipulating the other bits manually (or having 40 different dim styles, one for every case). We heavily mix architectural, mechanical, engineering, and schematic styles/disciplines, so we see every dimensioning method under the sun. It’s a bit fiddly to set up, but as you edit geometry you are editing the dimensions and annotations at the same time, so you know they’ve updated correctly. Most people I’ve worked with prefer to dimension in model space, with multiple dimension styles and layers for each view port scale. and creating dimensions that cross paper space between viewports simply isn’t possible. In this case, checking that the dimensions have updated correctly in paper space every time you edit something in model space is just a Right Royal P.I.T.A. In the Joinery industry we often create ‘Broken’ views with the item drawn full size in model space, but only the interesting bits laid up on a sheet. In this case, you may well have multiple floating view ports on a layout. If you are an Engineer, it’s likely that your drawings will contain a great many more orthographic views. Because there is only one view port per layout, you only have one place to check and see that you’re dims are OK. The size and position of the view port isn’t likely to change over the duration of the job, so you can dimension in paper space with confidence that your dimension won’t become un-associated by moving the view port around. Characteristically, architectural drawings involve many Xref’s compiled in model space, with just one floating view port per layout. If you are an Architect, dimensioning in paper space might work out just peachy.
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