UE Freezes After Unticking 'Overridden Light Map Res'

On the spline blueprints construction script, if I select ‘Add Spline Mesh Component’ then untick ‘Overridden Light Map Res’, Unreal Engine starts to not responding. It takes minutes to continue. However, compiling the blueprint only takes a few seconds. My CPU is 2.2Ghz quad core.


  • Does this occur in a clean, blank project with no additional content or is it limited to one project?
  • What steps did you take to reproduce this error on your end?
  • Do you have to manually shut down the editor or does it eventually return to working?
  • Can you post a copy of your dxdiag here so I can take a look?

This problem only occurs in this blueprint. Even if I break the lines from that node, result is still same.

I open this blueprint, then I check the box or uncheck the box. It always happens.

Editor continues working in 2 to 3 minutes.

Where can I copy the dxdiag?

If you go to your windows start menu and type dxdiag into the searchbar, the dxdiag.exe should appear in the start context menu. Open this file and there should be an option to save the file as a .txt. Do this and upload the .txt here.

Hi , here is the dxdiag file: Also you can easily reproduce this issue with the project file:

Open up the project, go to Content>RORContent>Blueprints>TrackGenerator, look for AddSplineMeshComponent which is under BuildTrackElement function, tick the OverriddenLightmapResolution option. Some other options are also causing long waiting times, but this is one of the longest operations. I think there is an issue with the creation time of the actor components, however, since I didn’t compile the blueprint, it musn’t call constructions script. I think it calls all construction scripts every time I change a variable on some nodes.

Hi -

So I am testing your current uploaded Example and I am getting a moderate pause when you click the Overridden LightMap Resolution checkbox, but considering the amount of items that are generated using that node, I would expect a bit of a pause as it attempts to alter the Lightmap Resolution of those objects. I should not I have tried in a blank BP Actor with the Add Spline Mesh Component and had no lag in pressing the override.

Once the item is ticked, compiling afterwards should be relatively quick as the changes are implemented at the time of selection.

With you PC make sure as well that you are running on your Nvidia Mobile card and not on your intel integrated graphics card as well, this will speed things up as well.

Thank You