light map UV generation

Hi guys,

I’m trying to follow up one of new features regarding light map UV generation where is this tool?
Can’t find this generator in UE 4.5 preview version. Anyone?

There’s checkbox ‘Generate Lightmap UVs’ under Build Settings on the right inside StaticMesh Editor:


All you need now is to check it and press ‘Apply Changes’
It automatically generates second UV channel with lightmap unwrap

Thanks for your answer Revenvik!
I was looking the option out of Build button on the main menu.