Creating sky portals by the direction of light

…Sky portal nodes are actually aerial lights, which have a…sky portal shader, plugged into the light shader and photon emitter.…When we're dealing with sky portals, what we want to consider…is the direction of the light coming in from those portals.…The aerial light size, rotation, and…location will dictate where those portals are.…And so in our scene we need to figure out the quality of light we want coming in.…I'll go into a perspective and take a quick look at this.…What I've got on the front of my building…then are large windows with different size glass in them.…

Theses will be a series of aerial lights which will all…be controlled by one portal node on the top of the building.…I've got my 5 round skylights and again these will…be 5 round area lights controlled by one portal node.…What I will do is to right click on my S.P.…placement layer, my sky portal placement layer and choose select objects.…I added the window glass onto this layer so I could hide…everything else easily and be able to place my area lights from portals.…