The curves appear fragile in RH8

Why is the accuracy of curves not good?

Standard graphics configuration.
Primary display and OpenGL: NVIDIA GeForce RTX 4060 Ti (NVidia) Memory: 16GB, Driver date: 7-12-2023 (M-D-Y). OpenGL Ver: 4.6.0 NVIDIA 536.67
> Accelerated graphics device with 4 adapter port(s)
- Windows Main Display attached to adapter port 0

OpenGL Settings
Safe mode: Off
Use accelerated hardware modes: On
Redraw scene when viewports are exposed: On
Graphics level being used: OpenGL 4.6 (primary GPU’s maximum)

Anti-alias mode: 8x
Mip Map Filtering: Linear
Anisotropic Filtering Mode: High

Vendor Name: NVIDIA Corporation
Render version: 4.6
Shading Language: 4.60 NVIDIA
Driver Date: 7-12-2023
Driver Version:
Maximum Texture size: 32768 x 32768
Z-Buffer depth: 24 bits
Maximum Viewport size: 32768 x 32768
Total Video Memory: 16380 MB

What do you mean by accuracy? Do you mean the jagged curve? Do you need to zoom in to see this?

Can you upload a file with a few example curves?

The curves appear fragile in RH8

So you’re talking here about the “accuracy” of the DISPLAY of the curves, not the curves themselves. I.e. antialiasing, pixelization, etc…

Thank you for replying
Is the problem with the settings?

Hi -

You could try to increase curve width to 2 px to see if that makes it better on yours sytem.
I’ve also put this issue on the list as RH-78744 Display: Curve drawing quality

This is another example, even if the width is changed to 2 px, It looks faded

Look like the antialiasing is not working well…



Hi -

RH-78744 Display: Curve drawing quality
→ This one is still open…

I went from V5 where curves are as one would expect in a high end CAD prog, no jaggies, just as if they were drawn on acetate with a rotring pen, well almost !
V7 and they were like twisted ribbons, so back to V5 I go., money wasted.

I am told V8 solves the problem to a fair degree. Its due to modern graphics cards and how rhino works with them I am told for V7.
Well I have a GTX3070 very current card, cost a fortune, and V5 is fine with it.

so if V8 has issues and bad twisted ribbons, and thats awful looking curves there, and this is just being added to a fix it list, thats extremely worrying.

I have just purchased V8 before the deal ended in feb 2023.

I hope my lines are not like that !

That simply shouldnt be , is Rhino going backwards , evolving back to a dinosaur ?

Its the first thing to get right, how the lines look, then start adding in commands etc.

Mcneel had a fix for V7…search these threads for it, gamma 2.2, fixed the lines twisted ribbon effect but messed up the grid colours so again back to V5 I go !


In my case, v8 looks slightly better than v7 in the wireframe/shared views. (Both curves are the same dimensions)

7 on the left, 8 on the right. You need to view full size for the info to show through correctly.

But when viewed in rendered or raytraced mode, 8 looks worse.

Looks like different antialiasing approaches are used from 7 to 8.


Hi Steve -

That’s not what I told you here:


searching through my posts and other posts on this I find:-

Started by Variant1,
@variant1 saying:-

and I chip in:-

and Steve Baer McNeel
@stevebaer says:-

and its this :-:

I do feel we made some improvements in this area in V8 though

that has given me hope, and I have bought V8 as I cant stay with V5 forever and V7 lines were awful.

There was also definitely some mention of a fix offered by McNeel involving altering gamma ro 2.2, as I tried it, and it worked :grinning:, but messed up all the grid line colours, I then adjusted those and got a working environment again, until I went to ghosted mode, and it was ruined. :rage:so back to V5 I went.

I will see if I can find that gamma fix someone posted, is there scope in that which McNeel can persue to solve this ?

and here it is:-

in which is the mention of gamma.

Gijs De Zwart
it’s still a bit of a workaround though, because it does affect lots of color settings. For example the grid looks really weird with this setting. I hope @stevebaer and @jeff can take note of the fact that gamma 2.2 seems to ‘fix’ display quality to level of V5 on Windows, as it could be a clue that these AA issues have been present ever since there are gamma settings in Rhino.

I dont want to find I have to remain on V5 as the most basic of things, line quality, is lost .

How have other CAD progs fared ? surely us CAD’ers all want lines without twisted ribbon effects. There would be uproar if new GPU’s messed up our beloved CAD progs ?

I am with a latest Nvidia and yet V5 is fine, so whats all this about new cards mess up lines, what is being said is new cards with new rhino is the issue, whilst new cards with old Rhino is fine.

Worried as yet to even install V8,

other threads on this I have found:-