If I restart Rhino the preview comes back and behaves normally, at least for a while. As you can see, this doesn’t need a large or complicated script to happen.
Because it’s an intermittent issue this is going to be a pain to nail down (is it cured or just hasn’t happened yet?), so before I start disabling all my plug-ins has anyone else seen and resolved this?
Running Rhino 7.19.22130.15001, 2022-05-10, but this happened in previous SRCs.
There is a known bug where if Grasshopper generates any geometry far enough away from the origin, the Grasshopper preview display stops working.
Then Clicking 4View is enough to reset it though, so you don’t have to completely restart Rhino.
I can’t see anything in the definition in that screenshot that would be creating very distant geometry, so I’m not sure if it’s the same issue.
Can you post the file?
This can happen with any GH preview items, it isn’t specific to curves, whether derived from character outlines or not. It is always just the Top view preview that vanishes. It is always the entire preview, never a subset.
I don’t have any sense of a series of steps or a particular action unfortunately. And I’m not observing the Rhino canvas continuously while I’m working in GH, so I may not be aware of the point where this happens.
The curve z-positioning is probably a rounding thing - the curves have been manipulated quite a lot by now.
If no-one else chips in with experience of this I’ll start removing plugins. Probably Bongo 3 first as it’s a beta and has its own previews.