Rhino 8 mitred linetype degrading in perspective

Rhino
1

Hi - with Rhino 8’s new linestyles, I get nice sharp corners in plan when the linetype is set to mitred corners (and “square” extension at corners) but in 3D perspective the corners degrade (unpredictably).
Here are screen shots - any idea why this is happening in a 3D view?

Thanks,
Matt Winkelstein

Rhino 8 linetype set to mitre corner - perspective view
Rhino 8 linetype set to mitre corner - perspective view1269×685 48.4 KB

Rhino 8 linetype set mitre corner - plan view
Rhino 8 linetype set mitre corner - plan view880×768 15.1 KB

2

Fiddling with my own file, I can not repeat this.

I do get some odd details if the curves are not Joined, which would defeat the corner mitering.

Please post a small sample file and the details steps so we can repeat it here.

Thanks

3

Sure - here you go - I get varying corner results depending on obliqueness of view and degree of zoom. Nice and clean in plan view only. Thanks
Rhino 8 line breakdown view.3dm (99.1 KB)

image
image1435×669 29.8 KB

4

Hi Matt - I see this, and I see it cleans up when the curve is selected. Looks like a ‘Arctic’ mode specific problem.

I’ll get this on the pile, thanks
RH-81114 Linetype display - wide linetypes
-Pascal

5

Hi Pascal -

Actually I’m getting this exact result in all display modes on my end. But, yes, when selected it does clean up.

Thanks

6

I see it in all display modes here…and it has to do with the planar object the lines are sitting on. There is some kind of depth/clipping issue going on with the fat lines and the planar object. Moving the lines off the planar object or the planar object down will eliminate the collisions.

The reason you don’t see this when the lines are selected is because selected objects are always drawn last and on top of everything else…thereby eliminating any possible collisions.

A better way to see what’s happening is to go into Ghosted mode…you can see how portions of the lines dip below the planar surface.

Lastly, the reason this always happens in Arctic mode, even with the planar object absent, is because Arctic mode uses its own Ground Plane setting, which defaults to ON… And you’re seeing the same problem with the Ground Plane object as you do with the planar object.

Atm, I’m not sure how to work around this, or even how solvable this is when you have coplanar objects and fat lines (or at least coplanar within the range of the linetype’s thickness).

We’ll look into it.

-J

7

I’ve slightly rotated the underlying planar surface and put the view into Ghosted mode here… to demonstrate what’s really going on…

image
image3156×1778 188 KB

8

I guess one possible “workaround” would be to just position the fat lines so that their “bottom” aligns with the planar object…

image
image1579×891 4.03 KB

But that might get tedious or not desirable…just throwing out interim ideas atm.

-J