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Lightmap too large despite no static shadows set on foliage

Hey guys,

The log under Lighting Results states: "InstancedFoliageActor_0 The total lightmap size for this InstancedStaticMeshComponent is large, consider reducing the component's lightmap resolution or number of mesh instances in this component" and the lightmap does not compute.

I know there is a gazillion threads about this warning/error but the funny thing is that none of my foliage has static shadows turned on.

It's an archviz project. I don't want to disable static lighting entirely because I need it for my building. So back to the foliage:

  • At least 95% is painted using the foliage painting tool.

  • All of it is set static but with Cast Static Shadows off

  • For trees and bushes Cast Dynamic Shadow is set to on, for patches of grass, it is set to off

Any ideas what could be causing this error?

I have also tried setting all of the foliage to Movable but it doesn't help much. I've tested it on a cut-down version of the scene (to the point when the lighting builds) and it speeds up the building about 30%. But should foliage even be set to Movable despite it's not going anywhere? I thought that setting it to static would have some performance/optimization benefits.

Product Version: UE 4.18
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asked Jan 09 '18 at 10:44 PM in Rendering

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