Landscape indirect lighting sample density?
Where can I change the indirect lighting sample density for landscapes?
I have a landscape and a water plane Static mesh, the indirect lighting samples on the landscape is more much denser than on the plane, how Lightmass makes the decision or can I control the density for the plane?
asked Dec 17 '15 at 05:35 AM in Rendering
You can adjust the Indirect Lighting Samples by opening the World Settings panel (Settings > World Settings), then you can navigate down to the Lightmass section and adjust the Volume Light Sample Placement to a lower value. The default value is 1. You can lower it by just a little to get slightly more dense placement or you can take it down to 0.1. You can try any value between 0.1 and 1 to get the density you like, but the more samples placed the more memory will be used.
There is no way to adjust this for a specific asset though. Also make sure that you're using a Lightmass Importance Volume to get even placement of these samples.
I hope this helps.
answered Dec 17 '15 at 07:28 PM
Tim Hobson ♦♦ STAFF
I did some tests on a fresh scene: the default Plane and a terrain with hills and valleys above or below the Plane. My conclusion is the automatic decision of Lightmass is not stable.
Volume Light Sample Placement Scale == 0.5: same density on Plane/hills/valleys, air is sparse, good.
Volume Light Sample Placement Scale == 0.25: air is much more denser, Plane assumes the Scale correctly, terrain is as sparse as air but not as dense as Plane (problem).
If you put some small buildings on a terrain, the tops of the buildings don't have dense samples.
If a building is tall enough, the top of the building will be considered walk-able and gets more samples.
This explains a situation I met before: ThirdPerson template scene (ground and walls forming a playable area), I made a terrain for testing which happens to be at the same height as the ground, then ground (and terrain) get less samples but the wall tops are good.
Follow this question
Once you sign in you will be able to subscribe for any updates here