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Allegro Graphics

PCB6453

Hello All,

Has anyone run into these issues with the graphics in Allegro?  Below are a few samples.

1.  I have the rats nets on and when I move the component, the rats net line stays where it is and doesn't move with the component even after placing the component down.  What I have to do is exit out of Allegro and go back in to refresh the display.  FYI, I believe that for a ratsnet to follow the component, I have to disable or enable (I can't remember) "Slide Etch"?  But this wasn't the case at all.

2.  There are other times when it will not adjust the via shape clearances even after I "Update to Smooth".  Same thing, I have to exit out then go back in.

3.  One last example is when I try to move a trace or via and I cancel.  Sometimes the via or trace just visually disappear and when I exit out of the program, it comes back.

I'm thinking it was my graphics card but found out that my colleagues ran into the same issue.  I've only had these issues with V17.4.

Thanks in advance for any feedback.

MG

  • 0

    Hi, there have been many display related issues with 17.4. What particular version are you using ?.

    On the Rats if all the rats are off and you move a component the rats should should up, but if the move panel has slide etch enabled the rats wont show.

    It sounds like you might be having an OpenGL issue. You can verify OpenGl is enabled by going to User Preferences > Display  > OpenGL

    Make sure disable_OpenGL is not checked.

    Best Regards.

  • 0 in reply to excellon1

    I'm using 17.4 S034. I will check if there's a new service pack.  As for the disable_OpenGL, it is  currently not checked.

  • 0 in reply to PCB6453

    To run graphics properly on a Windows machine using OpenGL, it is important that only one graphics card is used by the system. Some systems have both GPU and an integrated adapter running at the same time, resulting in unpredictable results in rendering. Please check your setup. Example below show two display drivers in device manager.

    Please come back and let me know if the above is true.

    Failing that we may need to directly set your plugin path using a windows environment variable to ensure the graphics card is being utilised. Please let me know what card vendor and type is used. 

  • 0 in reply to John T

    Sorry for the very late response.  I didn't get a notification that there was a message.  I have 2 listed  Intel UHD Graphis 770 and Nvidia RTX A400.

  • +1 in reply to PCB6453

    You have several options: Please first make sure to update both graphics card drivers and restart the machine. 

    If the situation has not improved, you should try to disable one of the gpu devices in Device Manager > Display Adaptors >> (Rclick) Disable Device. Restart and check if this resolves the conflict. The usefulness of this is dependent on your system's usage of monitors and ports 

    As you have a CUDA supported GPU, you can also attempt address this conflict using the following steps in an effort to force Allegro to use the Nvidia card. To do this please go to Windows environment variables and add the new environment variable:

    NV_PLUGIN_PATH 

    Please set the value to %CDSROOT%\tools\plugins\gpu
     Here, %CDSROOT% points to your installation directory. You should arrive there by entering this into explorer, which means you don't need to type the full path into the environment variable value. 

    A third option is to disable gpu in your user preferences. 

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