Welcome, Mark! We're always glad to see new players.
Actually, I did go through the pyramid.
By the way, rob, I've had lots of fun with this one.
As far as crossing metal bars, that is considered welding and is perfectly light, as rob said.
It's the overlapping of nodes with each other or other materials that generally causes the dark force. An indicator of the force is if materials jump unnaturally at the start of simulation.
The "Force" explained:
viewtopic.php?f=3&t=237Somewhere on this forum there is a long thread discussing the thin line between light and dark for contests, but I have not been able to find it since the first time I read it...