When you say lightmapper u means cubemap sphere?

Name as "env light combined probe"?

No, I mean the VRAD3 lightmap baking tool that was added recently. It is not documented on the wiki yet, but it's accessible from the the custom options in the Build Map dialog. Unlike the other light baker, it lets you build texture mapped lighting on meshes and static props.

It doesn't seem to scale that well with huge environments with a lot of detailed props though. Using it on a forest map with a few thousand complex trees makes it generate a several gigabyte sized scene cache and then crash. I've gotten around it by using simpler versions of my tree props, but I was just wondering if there was any way of excluding props from being used in the baking scene.

Probably this is a early feature who going better with time. Bytebyframe hav a similar problem with it. It crash too. BTW interesting fonction. Keep an eye on it.