What is 4d: Definition and 127 Discussions

4D film or 4-D film is a marketing term for an entertainment presentation system combining a 3D film with physical effects that occur in the theatre in synchronization with the film. Effects simulated in a 4D film may include rain, mist, bubbles, fog or smoke, wind, temperature changes, strobe lights, scent, vibration and motion. Seats in 4D venues may vibrate or move a few centimeters during the presentations. Other common chair effects include air jets, water sprays, and leg and back ticklers. Auditorium effects may include smoke, rain, lightning, bubbles, and smell.
Because physical effects can be expensive to install, 4D films are most often presented in custom-built theatres at special venues such as theme parks, amusement parks and zoos. However, some movie theatres have the ability to present 4D versions of wide-release 3D films. The films Journey to the Center of the Earth (2008) and Avatar (2009) are among the films that have received a 4D treatment in certain theatres. There are also mobile 4D theaters, which are mounted inside vehicles such as enclosed trailers, buses and trucks.
4D films are distinct from four-dimensional space. Notable historical formats for providing different aspects of a "fourth dimension" to films include Sensurround, and Smell-O-Vision. As of June 2015, about 530 screens worldwide have installed some 4D technology.

View More On Wikipedia.org
Recent contents Top users
  1. A

    4D angular coordinate system and corresponding hypervolume element

    I am looking for a 4D angular coordinate system (radius and three angles) and its corresponding "hypervolume element". 2D: polar coordinates - dA = r dr dtheta 3D: spherical coordinates - dV = r^2 sin(phi) dphi dtheta dr 4D: ?
  2. S

    Stable Knots in 4D: Proof and Directionality

    I've seen the statement repeated in many places that a stable knot comprising 1D curves cannot be created in 4D, since it's always possible to untie the knot by moving in the 4th dimension (whereas it is possible to create a stable knot in 4D using 2D surfaces). Can anyone point me to an...
  3. marcus

    Major paper by Fairbairn-a way to put matter into 4D quantum gravity

    Major paper by Fairbairn--a way to put matter into 4D quantum gravity I expect this paper will "raise the dead" in the sense of evoking a comment from John Baez :-). It develops some lines of research he was working on three years ago. It references work by Derek Wise, a Baez PhD----also...
  4. snoopies622

    Can a 4D Schwarzschild Manifold be Embedded in 5D Hyperspace?

    Can a 4-dimensional manifold with the Schwarzschild metric be embedded into a flat manifold of 5 (or more if necessary) dimensions? In other words, are there functions of t,r,\theta , \phi and M such that if x_1 = f_1 (t,r,\theta ,\phi ,M) x_2 = f_2 (t,r,\theta ,\phi ,M) . . etc...
  5. E

    Does string theory gravitons have 4D GR as its low energy limit?

    Lisa Randall said "string theory reproduces GR in 10 dimensions" Does string theory gravitons have 4D GR as its low energy limit? I know that its lowest mode vibrations corresponds to a massless spin-2 particle, the graviton. I know GR in 4D can be extended with susy. Does it reproduce...
  6. E

    How similar is Wen's spin lattice model to LQG's 4D spin foam theories?

    Is there a way to get a local bosonic theory out of spin foam formalism? Xiao-Gang Wen's suggestion, first published 6 Jul 2004 http://arxiv.org/abs/cond-mat/0407140v2 Page 8 "Remarkably, it appears that the theory of loop quantum gravity can be reformulated in terms of a particular kind of...
  7. S

    Exploring the Possibilities of Drawing 4D Shapes in 3D Space

    this may seem quite stupid to many of you but i was wondering how it is possible to draw 4D objects. I have seen pictures of 4D objects such as the hyper-cube etc, but they are drawn in three dimensions. The picture of a hyper cube that i looked at seemed to me to just look like a cube with a...
  8. marcus

    Baratin-Freidel: Hidden Quantum Gravity in 4d Feynman diagrams

    http://arxiv.org/abs/hep-th/0611042 Hidden Quantum Gravity in 4d Feynman diagrams: Emergence of spin foams Aristide Baratin, Laurent Freidel 28 pages, 7 figures "We show how Feynman amplitudes of standard QFT on flat and homogeneous space can naturally be recast as the evaluation of...
  9. V

    Why Can't We See 3D Shadows of 4D Objects?

    Yo anyone, Could someone enlighten me as to why, if there is a 4th spatial dimension, we can't see 3D shadows of 4D objects? Lots of talented people built an amazing 3D shadow of a 4D object but I'm almost certain I've never seen one pop in and out of existence while on the way to the shops...
  10. T

    Need 4d electrodynamics Book Names

    Any one can guide me to some good books about 4-dimentional electrodynamics? I don't want books that starts from electromagnetical theorems for maxwell, i want them to start from 4-dimentional systems and operations on them or tensors about them Thanks,,
  11. marcus

    Exotic Statistics for Strings in 4d BF Theory

    Baez et al revised the title of their March 2006 paper to say "strings" instead of "loops" and reposted it http://arxiv.org/abs/gr-qc/0603085 Exotic Statistics for Strings in 4d BF Theory John C. Baez, Derek K. Wise, Alissa S. Crans 41 pages, many figures. New version has minor corrections and...
  12. T

    Deriving the 4d continuity equation

    Well we start out with -\frac {d} {dt} \int_{V}^{} \sigma dV = \int_{\Pi}^{} \vec{J} \cdot d\vec{\Pi} Using the Gauss theorem \int_{V}^{} (\frac{ \partial {\sigma}}{ \partial {t}} + div \vec{J}) dV = 0 so \frac{ \partial {\sigma}}{ \partial {t}} + div \vec{J} = 0 and written in 4D...
  13. marcus

    Spinfoam 4D unification hazards a prediction

    To be science a theory must bet its life on the outcome of some future observation. That is what it means to predict something new and to be falsifiable. If the observation goes against the theory's prediction then the theory is wrong. so the theories of space time and matter that are currently...
  14. P

    Is the universe a 3D manifold living in 4D space?

    I only learned the meaning of a manifold recently and in the most elementary terms but I thought that I might link it with this example. It seems that the universe is made out of 3D objects. So put all of them together (stars, black holes, galaxies etc) and you have the whole universe. It...
  15. S

    Is the Universe a 3D Surface of a 4D Hypersphere?

    Please follow my deduction and tell me where am I wrong, or maybe I’m not? 1) the cosmological principle: "Viewed on sufficiently large distance scales, there are no preferred directions or preferred places in the Universe" it says that there is no center of the universe, or in other...
  16. daniel_i_l

    Unraveling the Mystery of Warped 4D Spacetime

    In 2D for example, warping it only makes sense in a 3D enviorment. In a 2D world, bending 2D would be meaningless. So in GR when we talk about bending 4D ST, is a fifth dimension needed to give ST something to "bend into"? If not, in what sense can we talk about warped ST? I suspect that...
  17. G

    Would forces act with the same symmetry in 4D as it does in 3D?

    Would forces act with the same symmetry in 4D as it does in 3D?
  18. G

    Stability of 4D Gravity Model: Examining Possibilities

    I know that gravity can be extended to 4D but the conclusion always seem to be unstable, is the reason why they come up with unstable orbits and atoms is because they take how gravity acts here in 3D physics and apply it the same way to 4D physics? How about modificating the model? but we just...
  19. E

    4D spacetime Light cone Twins paradox

    I'm an "on-my-own-free-time" arm-chair student of physics. Lol. So if this question is way off the mark my apologies. Feel free to let me know where I’m off base. Anyway... For me, a great visual example of the twin paradox was found at this site...
  20. marcus

    Can Loll and Westra Extend Their 2D Topology Sum Over to 4D Quantum Gravity?

    this poll refers to this other thread https://www.physicsforums.com/showthread.php?t=81295 when I first read the "sum over topologies" papers linked there, i was very optimistic. Loll and Westra have been able to make the CDT path integral in 2D sum over topological variation the...
  21. M

    Humans have true 4D spatial vision

    Humans have full 4D spatial vision Consider this: 1) objects in motion show non-simultaneities along the direction of motion (the "temporal distance" between the endpoints is \gamma vl/c^2) 2) objects in motion show time dilation (the "temporal velocity" runs slow with a factor 1/\gamma)...
  22. G

    Life Improbable In 4D+ Universes

    http://www.astronomycafe.net/qadir/q1940.html Is this true?
  23. C

    A question about movement in 4D

    Okay, I understand that if you dedicate some motion to one dimension at a constant rate you consequently pull motion from another dimension. Like driving at an angle rather than a straight line traveling a longer distance to a said stopping line (traveling in two dimensions rather than one). I...
  24. R

    Can we rotate 3D objects in 4D space?

    Suppose you have a piece of paper in the shape of a left shoe, on a flat surface. Suppose also that it can only stay in contact with the surface. No matter how you move it or rotate it in the 2D surface, it cannot become a right shoe. However, if you move it out of the 2D space, flip it and...
  25. O

    Explaining 4D Space-Time in Simple Terms

    Can anyone explain 4D space-time in a simple form ? Some say the Hawking's expalanation is the simplest but I don't get it :biggrin:
  26. marcus

    Can you explain Emergence of a 4D World ?

    Can you explain "Emergence of a 4D World"? Can anyone help explain the new paper "Emergence of a 4D World from Causal Quantum Gravity" by Ambjorn, Jurkiewicz, Loll? http://arxiv.org./hep-th/0404156 ten pages involves monte carlo simulations (computer experiments)
  27. K

    What Would Happen to Electromagnetic Force in 4D?

    I hope my question makes some sense; if not, just post an "evil smiley" and ignore it :smile: So, my only "knowledge" about this is based on one of Hawking's books, wherein it is written: If space had four dimensions instead of three, gravitation would behave differently (I think it was...
Back
Top