I recently added a river using the BP_RiverMaker in the Kite Demo project. When I tried to build the lighting I got error “Performance Warning BP_RiverMaker_13 Large actor receives a pre-shadow and will cause an extreme performance hit unless bCastDynamicShadow is set to false.”.
The “build lighting only” option was grayed out and all shadows in the project disappeared. So I removed the BP from the scene, and the error message is gone, but now I can’t build the light. The option to build lighting only is still grayed out. If I click “build” the swarm agent never starts and there are no error messages. The problem is project wide too, meaning I can’t build the lighting on any level within this project. Other projects work just fine.