Block instances not showing in pen display mode

I have a model that includes several instances of a block. These appear OK in most display modes, but not in pen mode. They also appear without outlines in artistic display mode. Am I doing something wrong?

This is pen mode:

This is artistic mode:

And this is ghosted mode:

The collection of 6 rivets with domed heads are block instances, the remaining items are just normal polysurfaces. Should I expect block instances to show in these display modes?


This is an open bug and hopefully there will be a fix soon. In the meantime, you’ll need to explode the block to get the silhouette lines with blocks when using these technical display modes.

2 years later:
Any ETA to fix this bug, please? Exploding blocks produces extremely large models (over 500MB).

Not sure about Rhino for Mac, but on the Windows version, the following workaround seems to help:

  1. Edit the block to include a curve somewhere. I usually just do a quick DupEdge on something. Save the block, and go back to your main model.

  2. Select all instances of that block, move them then move them back (easiest way for me is to nudge left one tap, then nudge right one tap).

  3. That block will now show up in Pen and Technical. Repeat for others.

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Sorry to be the bearer of bad news, but this bug will not be addressed until Rhino 6 for Mac, I’m afraid. No ETA on that product yet.

It works, thank you

Glad to help!

It’s 2019 still not fixed…


Hi, Yes I am having the same issue. This is a custom Technical Display Mode and using clipping plane fills/edges.

With Blocks:

Blocked exploded:

This would be a nice bug to get fixed.

Hi - the bug that was logged as part of this discussion was fixed in April.
Please post the 3dm file that you are having problems with and also run the Rhino SystemInfo command and post the result in a post here.