Rhino for Windows
Is that possible to create detail views with a custom polygon line? This has a lot of benefits to cover unwanted areas in plan.
Not currently. I know non-rectangular details have been wished for before though. Your best bet at this point is multiple details, or if that doesn't get you what you are after, using a solid hatch with white print color in layout space to mask out the areas you don't want (for instance if you are trying to fake a circular detail).
I hope Rhino will have this ability in the future. In my work, I often have to almost 'sculpt' the viewports to maximize the page. There's nothing I hate more than getting a 16 page set of drawings that could be 4 pages with a bit of page management - but good page management assumes the ability to manipulate viewports beyond the single rectangle shape. The attached drawing has been knocked down to a JPG with title blocks deleted and I've thickened the lines dividing viewports to illustrate what I mean.
You can overlap details to get something similar to what you are after in the above example. The trick is just to always leave a spot for each detail which has no overlap so you can double click into it.
Yes, before AutoCAD LT had polygonal viewports that was the trick - leave a bit of overlap.
But if you'll look at the large viewport to the left and the polygonal viewport to the right you'll see why that can't be done in this situation. If I'm limited to rectangles I can have the left viewport or the right viewport but not both. The L shape of the right viewport is what's maximizing my page real estate here.
Thanks for the feature request. I looked into this one and it has been filed a few times as RH-2254, RH-2952 and RH-2574. These are not publicly visible requests at this time. I'll nudge them all and link to this thread.