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What is CONTENT_SKY and CONTENT_EMPTY supposed to represent?
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sky is something like water in quake. weaker than solid, but stronger than 'outside' (which gets replaced by solid after the bsp tree is build).
sky brushes thus end up as thin volumes on the edge of your map, allowing projectiles to enter them without the client seeing the explosions etc (unfortunately players can enter the volumes too [water!], so try to keep them <=16qu thick if that's a risk).
the qc detects the contents and just disables the particles, which is its attempt to make the missile appear to vanish on the horizon or whatever... quake maps are not infinite.
empty is merely the absence of other content types (empty parts 'outside' the map will get replaced by solid, which reduces the number of surfaces+leafs needed, simplifying the bsp).
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