Lightmapper(device, root, scene, renderer, assets) 

Parameters

device	pc.GraphicsDevice	The grahpics device used by the lightmapper.
root	pc.Entity	The root entity of the scene.
scene	pc.Scene	The scene to lightmap.
renderer	pc.ForwardRenderer	The renderer.
assets	Array	Array of assets to lightmap.

bake(nodes, mode) 

Generates and applies the lightmaps.

Parameters

nodes	pc.Entity	An array of models to render lightmaps for. If not supplied, full scene will be baked.
mode	Number	Baking mode. Possible values: pc.BAKE_COLOR: single color lightmap pc.BAKE_COLORDIR: single color lightmap + dominant light direction (used for bump/specular) Only lights with bakeDir=true will be used for generating the dominant light direction.