Preview watermark still here after building

Hi
The preview watermark is till here after I built the light. Any ideal why?Also for some reason my level takes about 15 hours to build the light. But I my level is not complex at all. I believe that I only have a direcational light and skylight. Any idea why??? Thanks

Hi Yingbao,

There are a couple of possibilities for why this could be. If you have any procedural or static objects that are being spawned in after the lighting has been built this could indicate why the preview mark is there.

You can open the Output Window (Window > Developer Tools > Output Log Window) and type in DumpUnbuiltLightInteractions

This will print out any static meshes that have not had lighting built for them to give you an indication as to what the error is. If you copy the log and post that here in an attached text file I can have a look.

Additionally, lighting complexity for a scene is not solely determined by the types of lights that you have in your scene but the number of actors and their geometric complexity will add to the calculations needed when Swarm Agent /Lightmass is processing any static lighting.

I hope this helps.

Tim