In Portal, the player controls the protagonist, Chell, from a first-person perspective
as she is challenged to navigate through a series of rooms using the
Aperture Science Handheld Portal Device, or portal gun. The portal gun
can create two distinct portal ends, orange and blue. The portals create
a visual and physical connection between two different locations in three-dimensional space.
Neither end is specifically an entrance or exit; all objects that
travel through one portal will exit through the other. An important
aspect of the game's physics is momentum redirection.[13]
As moving objects pass through portals, they come through the exit
portal at the same direction as the exit portal is facing and with the
same speed with which they passed through the entrance portal.[14]
For example, a common maneuver is to jump down to a portal on the floor
and emerge through a wall, flying over a gap or another obstacle. This
allows the player to launch objects or Chell herself over great
distances, both vertically and horizontally, referred to as 'flinging'
by Valve.[13]
As GLaDOS puts it, "In layman's terms: speedy thing goes in, speedy
thing comes out." If portal ends are not on parallel planes, the
character passing through is reoriented to be upright with respect to
gravity after leaving a portal end.
MINIMUM
Windows 98/2000/ME/XP
Pentium III or AMD Athlon 800MHz Processor
256MB RAM
2GB Hard Disk Space
Nvidia TNT2, GeForce 1, 2 or 3, ATI Radeon 7000, 7200, 7500 or 8500, or Matrox G450 Video Card
DirectX Compatible Sound Card
DirectX 9
MAXIMUM
Windows 7/Vista (32 or 64 bit)
Intel i7 Quad Core 2.8Ghz or AMD equivalent
3GB System RAM (High)
30 GB Hard dDisk Space
nVidia GeForce 9800 GTX / ATI Radeon HD4850 Video Card
Direct X 9.0 compatible supporting Dolby Digital Live
DirectX 9.0 - DirectX 11
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