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CS_133700313-Newcomer
3-Newcomer
June 23, 2026
Question

Arc lines not showing when sketched, at ragular zoom

  • June 23, 2026
  • 1 reply
  • 33 views

Hey there, 

Issue: when sketching an arc, creo will not show the expected curve, only its end points. (Same for circles, then just its center point)

The line becomes visible when zooming out (sometimes quite a bit), but I can not work with that – I need to see my lines. As far as I know that behaviour is to be expected for small sized sketches and/or far zoom-ins. My issue however is happening regardless of the dimensions, only dependent on zoom level and not heavily zoomed. 

This behaviour is new, it started this afternoon with no apparent reason. 

 

Details:

  • creo 12.4 Educational,  I have about one year experience using creo, using it frequently
  • Windows 11
  • Dell XPS 17 from 2020, screen resolution at 3840x2400
  • GPU 0 (NVIDIA GeForce RTX 2060) + GPU 1 (some Intel UHD Graphics)
  • config.pro: Graphics on win32_gdi (open_gl will render viewport into a black screen)

Today I did add a second screen for a brief moment and adjusted the Windows Display Scaling from 250% to 100% and back to 250%. I am not sure if my issue was there before, I noticed it sometime after. Creo was not started yet when I did change the Windows Display Scaling.

I am not aware of any other change besides this. I am also not sure whether the display scaling could be related to the issue, since I know Creo to occasionally behave in unexpected ways on my machine anyways...

Need any more info?

Arc present at default zoom (values in mm)
zoom in by one mouse wheel increment and the arc is gone. Note that this is neither small values nor heavily zoomed in (values in mm)

 

1 reply

MikeBennett
MikeBennett16-Pearl
16-Pearl
June 24, 2026

Hi ​@CS_13370031,

 

Tough to pinpoint with this one.  To start, the machine is not supported on Creo 12.4.  Refer here for the list of supported machine configurations. Since you use graphics win32_gdi, you’re probably already aware of this situation.

The black screen could be related to the anti-aliasing setting for which the default value changed starting in Creo 11.0.  You can try changing the value of enable_fsaa to another value along with graphics opengl. CS402384 notes that some unsupported hardware configurations have reported black graphics area/  values for enable_fsaa are off/2/4/8/16.

 

I’d start with those and perhaps other community members will have recommendations for using Creo on unsupported machine configurations.

 

Hope this helps,

Mike

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