Hi Foolish Frost. I need money for my project, so i decide to make a simple Portal package this weekends. You will be able to buy it from AssetStore, after unity team will aproove it. In this package you will see how to fluidly teleport objects through portals with keeping phisics works right. But there is no advanced collision part that disable collisions between object in portal, and colliders behind it (portal). Here is future DEMO.