Portal Crossing  
 

In portal engines, detect when the viewer change the current

sector, is a problem. If the sectors are simple

boxes, aligned with universe plans, it is easy. But the

scenery design would be very limited.


The implementation use the distance between viewer

and the portal plan. If the viewer is collidin and

the distance is negative, the portal is crossed.


3DFC v0.0.1 just test if viewer distance is negative between

portal plan. Because this, is impossible design portals sharing

the same plan.


Other two problems remain with no solution on 3DFC v0.0.1.

What to make when a visible object is between two sectors.

When the viewer is clossing a portal and the portal is clipped

by the near Z plan.

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