Annotative scaling of perspective details?

[brendan2 (Brendan)]

Oblligatory apology am very new here- workplace just switched to Rhino. Was previously working n autodesk and sometimes sketchup.

Am I crazy, or does scaled dimensioning in layout-space only work for details of parallel-projected viewports? I can’t seem to make properly scaled dimensions in layout-space of perspective details- but it all works exactly as expected with any details that are flat-projected viewports.

I’m confused as I’ve been used to this functionality in other software for years now- so I’m thinkiing maybe there’s something I’m just not understanding?

Thanks in advance
B

[wim (Wim Dekeyser)]

Hi Brendan -

@brendan2

I can’t seem to make properly scaled dimensions in layout-space of perspective details- but it all works exactly as expected with any details that are flat-projected viewports.

That’s the way it works, yes.
In Rhino, dimensions are created on a plane and, in a layout, the model space distances are projected to the paper space plane. For perspective views, this results in numbers that don’t reflect the dimensions.

Apart from that,

Dimensioning Confusion

As an old-time ink slinging drafter, the rule was dimensions should Never be shown unless they could be checked with a scale. That means that dimensions were never shown in oblique or perspective views where they can not be checked. Early on, for this reason, Rhino did not display dimensions in perspective viewports at all. Against my strong objections, we relaxed that old drafting “rule” for the sake of convenience. Perhaps using the CurveLength “Text field” tool to create a piece of text or…

-wim

[brendan2 (Brendan)]

Thanks! appreciate the quick explanation and the helpful link.
Cheers.