They show up in Wireframe, But are lost inShaded View. Rhino 8 in Windows 11.
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Thereās at least a couple things that might cause that. Check object properties isocurve density, for example.
That too! Haha, I remember now I was doing some work recently and that one almost eluded me 
Last couple weeks on my rectangular prism project Iām like whereās my isocurves >_< 
At first I thought it was an āextrudedā srf thing or somem. I need to remember that checkbox. 
Yeah, the thing is that this setting is now display mode-per-display mode - so you need to check them all. If in object properties āshow isocurvesā is unchecked, that will affect all display modes. So it they are there in one display mode and not in another, thatās the first setting I suspect. I also suspect they will soon turn this option off by default.
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Thank You Helvetosaur That was the fix that was needed.
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My rhino 8 has the same problem and tried all the methods mentioned here. The wires are still not showing. I wonder if the isocurve density might be the problem. I canāt find where the isocurve is located and how to adjust the density. Thank you very much
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HI
Could you please advise where I could find the isocurve? How to adjust the density, please
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@jessicainusaca Upload a .3dm file with an example of an object which does not display isocurves. You can upload the file by clicking on the vertical arrow icon above where you type a post, or by dragging the file to where you type a post.
Also run the Rhino command SystemInfo and post the results.
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Iād have to see if thereās something else not mentioned yet.
Thank you so much
I will attach some photos
I donāt know what went wrong.
It doesnāt show the curve on the white rectangular
It is supposed to be in shaded mode
but my perspective view seems at the wired mode
Thank you so much
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I tried to fix the setting
but the rectangular planar is still in all white
no wires ( or isocurves ) showing
you mentioned the density
Where could I find the adjustment for the density?
Why does my perspective view look in wired mode instead of shaded mode?
Thank you very much
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@jessicainusaca
Verify that extrusion are not being used. Extrusions do not have isocurves.
Options command:
The geometry stays exactly same when extrusions are not used. The file size may be very slightly larger but that is the only disavantage to not using extrusions.
Existing extrusion objects will remain extrusions unless converted to NURBS objects. Use ConvertExtrusion and select extrusions to convert them to NURBS. All extrusions which are visible can be selected using SelExtrusion
If the cause of no isocurves is not extrusions then select the object without isocurves and Properties command. Then verify that Show surface isocurve is checked.
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Your perspective view might simply be using a wired display mode.
I like to use these little down arrow buttons to access the mode choices.
Iām curious what mode you see in each viewport.
It looks like the upper left view might have a mode active that may have isocurves off or deactivated. If I remember right I think some modes will hide the option to even turn them on. Iām not sure if Iām just imagining it at the moment.
Hereās an example showing what I mean about a particular mode of the default rendered permutation, where I have chosen to turn off isocurves.
hereās a technical mode where I donāt even think the option is available.
Sometimes you can make copies of certain display modes to unlock suppressed options and change things that are otherwise not available for the default permutation.
So, iād first check those settings @davidcockey showed above, while another thing Iām curious about is the display mode parameters you may have as well.
Thank you very much for your response.
I checked every possible spot and still couldnāt figure out the reasons.
I checked the mode setting as well
I am thankful for your help
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