Call of Duty 4: Portals3

As may know, the Idea of portals is to divide your map in sections.

Each map may need specials solutions for portals, not always the buildings on a map are straight aligned and in a outdoor map, not always you want a concrete wall or a house in the middle for portals.

This tutorial will give you a couple of ideas about how to create portals in two differents situations.

In maps like Ambush(Convoy), Creek and Overgown, you will find certain terrains elevations, but they are not only decorative elements for the landscape, most of them are smart solutions for portal issues.

Example 1

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This is an example of a simple terrain elevation you can find or create on any map. the maximum height of this hill is over the top of the head on any player.

Without portals, the game assumes that you can see trough and will draw anything that is on the other side of the hill, lowering your FPS.

What needs to be done in this case is to hide the terrain, create a caulk wall hidden under the terrain, also the cell structure below the map, just like used in the portals 2 tutorial.

Next is to create the cells with their respective textures.

Finally, unhide everything. Now with some grass and a few rocks, this could be the perfect solution to dissimulate your portals in open space.

Example 2

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Some times creating portals in a urban environment with non aligned buildings is a bit complicated.

What I´ve done here is to create a closed prefab building so players wont be able to walk in, converted it in to detail so it cant interfere with portals and rotate it in the position I want.

When hidding some stuff as you can see here, besides the undergound structure, notice that i´ve created a hidden caulk block that goes inside the closed prefab building. This brush is aligned to the Grid, the building is not, It makes more easy for me to create portals and avoid leaking.

When finish, just bring everything back and we are done.