360 Degree Perspective concerns the formation, generation, capture, projection, representation or viewing of a complete 360-degree image or view of a surrounding spatial scene, optical vista or panorama. Instead of restricting perspective to one narrow forward-facing direction, 360 Degree Perspective extends the field around the observer, camera, object or representational system.
The term encompasses several related but distinct systems. An observer may remain at one fixed station point and look around the surrounding environment; a camera may capture many directions and combine them into a panorama; a representation may map a complete spherical scene onto a flat surface; or an observer or camera may move around a three-dimensional object to obtain views from all sides.
A fundamental distinction must therefore be made between changing viewing direction and changing viewpoint. A 360-degree image can be multi-directional without necessarily being multi-viewpoint.
What Is 360 Degree Perspective?
The Dictionary of Perspective defines 360-Degree Perspective as the formation, generation or viewing of a 360-degree image or view of an entire surrounding spatial scene, optical vista or panorama.
The concept is closely related to:
- Panoramic Perspective;
- Circular Perspective;
- Cylindrical Perspective;
- Spherical Perspective;
- Curvilinear Perspective;
- Sphere of Vision Perspective;
- Sphere of Revolution Perspective;
- Multi-Directional Perspective;
- Multi-View Perspective; and
- 3D Perspective.
These terms overlap, but they should not automatically be treated as synonyms. Each describes a different aspect of how surrounding or revolving spatial information is organised.
From a Narrow View to a Complete Surround
Conventional perspective images normally represent only a restricted angular portion of the spatial environment.
A standard photograph, linear-perspective drawing or conventional cinema frame selects one particular viewing direction and field of view. Increasing the field progressively includes more of the surrounding scene.
The progression can be understood broadly as:
Restricted View → Wide-Angle View → Panoramic View → 360-Degree Surround → Complete Spherical View.
360 Degree Perspective therefore represents one of the principal ways in which perspective can be expanded beyond the conventional rectangular forward-looking picture.
360 Degrees and Field of View
Field of View describes the total angular region captured, represented, displayed or visible within a perspective system.
A narrow-field image represents only a small section of the environment. A wide-angle image represents more. A complete horizontal 360-degree view includes every azimuthal direction around the observer.
The principle can therefore be understood as an expansion of perspective from one selected direction towards the total surrounding angular field.
360 Degrees Is Not Necessarily a Complete Sphere
An important distinction must be made between a horizontal 360-degree panorama and a complete spherical panorama.
A horizontal 360-degree view records or represents every direction around the observer at the relevant vertical field, completing one full circular revolution around the horizon.
A complete spherical view additionally includes the full range of directions above and below the observer.
Accordingly:
- Horizontal panorama: 360 degrees around the observer.
- Full spherical panorama: 360 degrees horizontally × 180 degrees vertically.
The second represents the complete surrounding sphere rather than merely the complete horizontal circle.
360 × 180 Degree Spherical Perspective
A complete spherical perspective represents directions covering the entire sphere surrounding a viewpoint.
This corresponds to:
360° horizontal × 180° vertical = complete spherical directional field.
The result includes directions:
- in front;
- behind;
- to the left;
- to the right;
- above;
- below; and
- through every intermediate direction.
This complete directional environment is closely related to the Sphere of Vision.
360 Degree Perspective and the Sphere of Vision
Sphere-of-Vision Perspective provides one of the most important forms of 360 Degree Perspective.
The observer, eye, camera or imaging system remains at a fixed viewpoint location while different directions around the surrounding spatial environment are explored.
The system can sample directions:
- forwards;
- sideways;
- behind;
- upwards;
- downwards; and
- through intermediate angles.
This produces a looking-out or looking-around perspective.
The defining principle is:
Fixed viewpoint + changing viewing direction = Sphere-of-Vision 360 Degree Perspective.
Looking Out and Looking Around
Looking-out or looking-around perspective extends ordinary observation across many directions from a common location.
An observer standing in the centre of a room, for example, can turn to inspect each wall, the floor, ceiling and the space behind them without fundamentally changing the original station-point location.
A camera system can reproduce the same general principle by capturing images sequentially or simultaneously in different directions around one common position.
The resulting images may then be combined to represent a complete circle, cylinder or sphere of surrounding vision.
Circle of Vision Perspective
Circle-of-Vision Perspective represents the surrounding environment through a complete circular arrangement of viewing directions.
It is particularly associated with the horizontal 360-degree field surrounding the observer.
The observer remains notionally at the centre while directions are sampled around the complete circle.
This produces a natural conceptual relationship between:
Circle of Vision → Horizontal 360-Degree Perspective → Panoramic Perspective.
Cylinder of Vision Perspective
A Cylinder-of-Vision arrangement extends the surrounding view vertically as well as horizontally while organising it around a cylindrical surface.
This is particularly relevant to cylindrical panorama systems in which the horizontal surround forms a complete 360-degree cycle while the vertical field remains limited compared with a complete sphere.
Cylindrical Perspective therefore provides an important intermediary between a flat panoramic picture and complete Spherical Perspective.
360 Degree Perspective and the Sphere of Revolution
360 Degree Perspective can also operate in the opposite spatial direction through Sphere-of-Revolution Perspective.
Instead of remaining at one location and looking outward, the observer or camera moves around a three-dimensional object and repeatedly looks inward towards it.
This produces multiple aspects of the same object from positions around a circular or spherical path.
The defining principle is:
Changing viewpoint around object + changing object aspect = Sphere-of-Revolution Perspective.
This is a genuine multi-viewpoint use of 360-degree spatial organisation and should be distinguished from a fixed-centre surrounding panorama.
Looking Around versus Looking At
The two principal 360-degree relationships can therefore be summarised as:
- Looking around: observer remains inside or at the centre of the spatial scene and turns through different directions — Sphere of Vision.
- Looking at: observer moves around an object and directs successive views inward towards it — Sphere of Revolution.
Both can involve a complete 360-degree range, but their viewpoint geometry is fundamentally different.
360 Degree Perspective and Panoramic Perspective
Panoramic Perspective is one of the principal families within which 360-degree images occur.
A panorama extends the represented field beyond that of an ordinary restricted image. It may be:
- a wide but incomplete panorama;
- a complete circular panorama;
- a cylindrical panorama;
- a complete spherical panorama;
- a fixed-viewpoint panorama;
- a multiple-viewpoint panorama; or
- an interactive panoramic environment.
Thus not every panorama covers 360 degrees, while a complete 360-degree surrounding image is a particular extended form of panoramic representation.
Four Broad Ways of Creating Panoramic 360 Perspective
The Dictionary of Perspective distinguishes several broad panoramic capture arrangements that help clarify the different meanings of 360 Degree Perspective.
1. Fixed-Viewpoint Panorama
A view is captured from one fixed position. The field may be wide or panoramic, while the viewpoint itself remains stationary.
2. Multiple-Viewpoint Panorama
Images obtained from more than one viewpoint or viewing angle are combined into a larger image or representation.
3. Unlimited-Viewpoint or Motion Panorama
A digital spatial model may be explored from many or effectively unlimited viewpoints, as with CAD modelling or Virtual Reality.
4. Revolving or Motion Panorama
A camera or observer moves around a three-dimensional object and records it from multiple directions, creating a Circle- or Sphere-of-Revolution relationship.
The label “360” therefore does not by itself specify which of these viewpoint arrangements has been used.
Multi-Directional Perspective
360 Degree Perspective is inherently multi-directional because the represented scene extends through many viewing directions.
Multi-Directional Perspective includes perspective images or systems captured, viewed or projected along multiple lines of sight, aspects or viewing directions.
However, those directions may originate from:
- one common station point; or
- several different station points.
This distinction is fundamental to understanding 360-degree images.
Multi-Directional Is Not Necessarily Multi-Viewpoint
A fixed-centre 360-degree panorama can contain many viewing directions without containing many spatial viewpoints.
If the camera rotates around its own projection centre, the viewing direction changes while the station point remains essentially fixed.
Such an image is:
- multi-directional;
- panoramic; and
- potentially 360-degree;
but it is not thereby automatically a genuine multiple-station-point image.
When the camera translates around an object or environment, additional viewpoint-dependent changes such as aspect and parallax can occur.
360 Degree Photography
360-degree photography uses photographic or digital imaging techniques to record a complete surrounding view.
A 360-degree photographic system may use:
- a rotating camera;
- multiple cameras;
- fisheye or other very wide-field lenses;
- mirror-based or catadioptric systems;
- several overlapping photographs combined computationally; or
- other panoramic capture arrangements.
The resulting image may be stored as a cylindrical, spherical or flattened panoramic representation and subsequently displayed through a variety of viewing systems.
Multiple-Camera 360 Systems
One method of expanding the captured field is to arrange several cameras or apertures around a common imaging structure.
Different cameras record different directional portions of the scene and the images can then be combined into a larger panoramic or spherical representation.
Such camera assemblies have developed from relatively simple multi-camera cylindrical systems to more extensive spherical configurations capable of recording much or all of the surrounding environment.
The geometry of the final image depends upon the number, placement and alignment of the cameras and the mathematical transformations used to combine their views.
Fisheye and Wide-Field 360 Perspective
Fisheye Perspective is closely related to spherical and 360-degree imaging because a very wide angular field can be compressed into a comparatively small image area.
A fisheye lens can represent most or all of a forward-facing hemisphere within one image.
Two or more suitable hemispherical images can then be combined to cover a larger portion, or potentially the whole, of the surrounding sphere.
Such images use curvilinear rather than ordinary rectilinear mapping, so many straight object-space lines appear curved in the resulting image.
Catadioptric and Mirror 360 Perspective
Another method of generating very wide or omnidirectional perspective views combines lenses with curved mirrors.
Such catadioptric systems can use parabolic, hyperbolic, elliptical or other mirror forms to redirect a wide surrounding field into a camera or sensor.
The resulting image can subsequently be transformed into cylindrical or other panoramic formats.
Mirror balls provide a related natural optical example: their curved reflective surface can capture an extremely wide surrounding scene within one compact image.
Stitching a 360 Degree Panorama
A complete 360-degree view does not necessarily need to be captured in one exposure.
Several partially overlapping images may be taken in different directions and then combined into a larger panoramic image.
The ideal fixed-centre case preserves a common projection centre as viewing direction changes. If the camera position translates substantially between component images, the resulting panorama can contain viewpoint changes and associated differences of parallax or object aspect.
The final stitched image therefore needs to be distinguished from the particular physical sequence used to capture it.
360 Degree Perspective and Spherical Perspective
Spherical Perspective maps viewing directions around a viewpoint onto a spherical surface or onto a flat image derived from that sphere.
A spherical perspective system may represent:
- a partial spherical field;
- a hemisphere;
- a horizontal 360-degree panorama; or
- a complete 360 × 180-degree surrounding sphere.
Spherical Perspective is therefore closely related to 360 Degree Perspective, but the terms identify slightly different properties: 360 degrees describes angular extent, while spherical perspective describes the geometry or organisation of the field and its representation.
Flattening a Spherical 360 Image
A complete surrounding spherical scene cannot be placed upon a flat rectangular image without transformation.
Different projection methods therefore map the original spherical directions onto a two-dimensional surface.
Possible spherical mappings include:
- equirectangular projection;
- fisheye projection;
- stereographic projection; and
- other spherical or curvilinear mappings.
Each transformation distributes directions, shape, scale and area differently across the final image.
Equirectangular 360 Degree Images
The Equirectangular Projection is one of the most widely used methods for storing a complete spherical panorama upon a flat rectangular image.
It maps spherical horizontal and vertical directions directly onto rectangular image coordinates.
A complete spherical equirectangular image conventionally represents:
360 degrees horizontally × 180 degrees vertically.
The resulting image normally has a 2:1 aspect ratio.
When viewed as an ordinary flat rectangle, the image shows substantial stretching towards its upper and lower limits. It is normally intended to be computationally remapped, wrapped around a sphere or interactively viewed as a selected perspective window.
360 Degree Perspective on a Flat Screen
A 360-degree scene can be stored upon a flat image even though the original directional field surrounds the observer.
This creates two distinct geometries:
- spherical or cylindrical scene geometry; and
- flattened image geometry.
A computer can then select a small region of the flattened panorama and reproject it as a conventional perspective view on the display.
The user appears to turn around within the image even though the physical monitor itself remains flat.
360 Degree Perspective and Virtual Reality
360-degree imagery is widely associated with Virtual Reality, but the two should not be treated as identical.
A fixed spherical panorama can allow the viewer to look in every direction around one recorded station point.
A fully modelled Virtual Reality environment can go further by permitting the observer to:
- look in any direction;
- move to new spatial positions;
- generate new views;
- experience changing parallax;
- observe changing object aspects; and
- interact with the represented environment.
Thus:
360 panorama = potentially unlimited viewing direction from a fixed recorded location.
Modelled VR = potentially changing viewing direction and changing station point.
360 Degree Perspective and Immersion
Expanding an image around the observer can increase the impression of being located inside the represented environment.
An ordinary picture is normally seen as a bounded rectangular image positioned in front of the observer. A surrounding panoramic, cylindrical or spherical image can occupy a much larger proportion of the visual field.
This changes the spatial relationship from primarily looking at a picture towards the experience of looking around within a represented environment.
360 Degree Perspective therefore has an important relationship with panoramic displays, immersive theatres and Virtual Reality systems.
Circular and Cylindrical 360 Displays
A 360-degree panorama may be displayed on a surrounding circular or cylindrical screen.
In such systems, the projected image can physically encircle the audience rather than being flattened onto one frontal screen.
Disney’s Circle-Vision 360 provides an example of a cinema format using projection screens arranged around the audience.
Such systems extend conventional cinema towards a panoramic looking-around form of perspective.
Spherical and Dome Displays
A surrounding image can also be projected or displayed upon the inside of a dome or spherical surface.
This permits imagery to extend not only horizontally around the observer but vertically above and potentially below as well.
The display surface and the original capture geometry must nevertheless be distinguished. A spherical display does not automatically mean that the represented image itself was generated through one particular spherical perspective method.
360 Degree Perspective and Five-Point Perspective
Five-Point Perspective is a graphical spherical-perspective method associated with representing approximately one hemispherical field.
Its principal directions include left, right, up, down and the central viewing direction.
This can represent approximately 180 degrees of the surrounding visual environment.
Five-point perspective therefore represents a substantial wide-field or hemispherical view, but it does not by itself provide the complete surrounding 360-degree sphere.
360 Degree Perspective and Six-Point Perspective
Six-Point Perspective extends the graphical system by adding the direction behind the observer.
The six principal directions can be understood as:
- front;
- back;
- left;
- right;
- up; and
- down.
Together these directions provide a graphical framework for representing the complete surrounding visual world.
Six-point perspective therefore provides one graphical route towards a 360-degree picture in all directions.
Dick Termes and 360 Degree Perspective
The work of Dick Termes provides an important graphical example of multi-directional and spherical perspective.
Termes constructs images from within a Sphere-of-Vision relationship and represents surrounding spatial information upon spherical surfaces known as Termespheres.
The method demonstrates how perspective can extend beyond one frontal picture towards a complete multi-directional representation organised around the observer.
It also helps illustrate the relationship between 360 Degree Perspective, Spherical Perspective, Sphere of Vision and Six-Point Perspective.
The Complete 360-Degree Horizon
In a complete surrounding horizontal view, the horizon is not merely a short straight line appearing across one conventional picture.
The observer is surrounded by a complete 360-degree horizon extending through every horizontal direction.
Different projection systems transform this circular relationship differently:
- a cylindrical panorama may unwrap it into a long horizontal line;
- a spherical display can preserve it as a surrounding circle;
- a curvilinear flat projection may represent it as one or more curves; and
- another graphical mapping may divide it between several regions of the image.
The apparent form of the horizon therefore depends upon the projection and display geometry used to represent the surrounding field.
360 Degree Perspective versus Ordinary Linear Perspective
Ordinary rectilinear perspective normally represents only a limited portion of the much larger directional environment surrounding a viewpoint.
Attempting to extend one conventional flat rectilinear projection across extremely wide angular fields produces increasing marginal scale and lateral stretching.
360-degree systems therefore commonly use other geometries, including:
- cylindrical projection;
- spherical projection;
- fisheye projection;
- curvilinear projection; or
- combinations of several individual perspective views.
The need for such alternatives demonstrates that the conventional rectangular linear-perspective picture is only one local representation within the much larger surrounding field of possible viewing directions.
360 Degree Perspective and Curvilinear Perspective
Curvilinear Perspective becomes particularly important when very large angular fields are represented upon a limited image surface.
Unlike rectilinear perspective, in which straight scene lines normally remain straight in the image, cylindrical, spherical and fisheye mappings may represent many straight object-space lines as curves.
This curvature is not necessarily an optical defect. It can be the deliberate consequence of mapping a very wide or complete surrounding directional field onto a different image geometry.
360 Degree Perspective and 3D Perspective
360 Degree Perspective can also be considered within the larger study of 3D Perspective.
A complete panoramic or spherical image represents a three-dimensional spatial environment through a large range of directions.
However, a 360-degree panorama may still be stored and displayed as a two-dimensional image and may remain based upon only one station point.
It should therefore not automatically be confused with stereoscopic, multi-viewpoint, holographic or volumetric 3D.
Angular coverage, dimensionality, binocular information and viewpoint freedom are separate properties of a perspective system.
360 Degree Perspective Is Not Necessarily Stereoscopic
A conventional 360-degree photographic panorama can be entirely monocular.
It may provide:
- diminution of size;
- foreshortening;
- occlusion;
- texture;
- colour;
- atmospheric perspective;
- spatial arrangement; and
- many changing viewing directions.
Yet it need not provide separate left- and right-eye views.
360-degree coverage and stereoscopic depth are therefore independent characteristics that may or may not be combined within one system.
360 Degree Perspective and New Media
Digital and New Media systems have greatly expanded the possibilities of 360 Degree Perspective.
A panoramic image can now be:
- digitally stitched;
- reprojected between different geometries;
- stored as an equirectangular image;
- wrapped around a virtual cylinder or sphere;
- navigated interactively;
- linked to other viewpoints;
- combined with three-dimensional models; and
- displayed through immersive or head-mounted systems.
Digital 360 Degree Perspective can therefore form one stage within much larger interactive, multi-view and spatial-information systems.
Fixed 360 Panorama versus Explorable 3D World
A fixed 360-degree panorama and an explorable three-dimensional computer environment can appear superficially similar, but their perspective capabilities differ fundamentally.
Fixed 360 Panorama
The observer can look around from one captured location, but ordinarily cannot move laterally through the scene and generate the new perspective relationships that would result from another station point.
Explorable 3D Environment
The virtual observer can change position as well as viewing direction, allowing new views, parallax, occlusions and object aspects to be generated dynamically.
The first is primarily a complete directional image. The second is a generative spatial model.
360 Degree Perspective and Perspective Category Theory
Within Perspective Category Theory, 360 degrees identifies an angular or directional property of a perspective system rather than a separate principal Perspective Category.
360 Degree Perspective can operate through several categories:
- Natural Perspective — the surrounding physical environment and spatial relationships around an observer.
- Visual Perspective — the visual appearance and experience of the surrounding spatial world.
- Optical Perspective — surrounding images formed through light, lenses and mirrors.
- Mathematical Perspective — circular, cylindrical, spherical and curvilinear mappings and transformations.
- Graphical Perspective — panoramic, five-point, six-point and other complete-field drawings.
- Instrument Perspective — panoramic cameras, fisheye systems, mirror systems and projection displays.
- New Media Perspective — digital panoramas, interactive spherical views, Virtual Reality and linked multi-view environments.
A 360-degree perspective system may therefore combine several categories within one complete imaging, representation and viewing chain.
Why 360 Degree Perspective Matters
360 Degree Perspective matters because ordinary perspective pictures show only a small part of the directional world available around an observer.
Expanding the field to a complete surround makes it possible to investigate:
- the complete horizon;
- the Sphere of Vision;
- looking-around perspective;
- panoramic and spherical imaging;
- multi-directional representation;
- multiple viewpoints;
- immersive displays;
- Virtual Reality;
- wide-field visual geometry; and
- the relationship between local perspective views and complete spatial environments.
The concept therefore expands perspective from a single directional picture towards the much larger problem of representing and exploring the complete spatial field surrounding an observer or object.
360 Degree Perspective — Frequently Asked Questions
What is 360 Degree Perspective?
360 Degree Perspective is the formation, generation, capture, representation or viewing of a 360-degree image or view of a surrounding spatial scene, optical vista or panorama.
Is a 360-degree panorama the same as a spherical panorama?
Not necessarily. A 360-degree panorama may cover the complete horizontal circle while possessing a limited vertical field. A complete spherical panorama covers 360 degrees horizontally and 180 degrees vertically.
What is a 360 × 180 image?
It is a complete spherical representation covering 360 degrees horizontally and 180 degrees vertically, thereby representing every direction around the viewpoint.
Is a 360-degree panorama multi-viewpoint?
Not necessarily. A fixed-centre panorama can capture many viewing directions from one common station point. It is therefore multi-directional without necessarily being multiple-viewpoint.
What is the difference between Sphere of Vision and Sphere of Revolution?
Sphere of Vision keeps the viewpoint at one location while looking outward through many directions around the surrounding scene. Sphere of Revolution changes viewpoint around an object while repeatedly looking inward towards it.
Is 360 Degree Perspective a type of Panoramic Perspective?
It is closely related. A panorama can cover less than 360 degrees, while a complete 360-degree surround is an extended panoramic form.
Is 360 Degree Perspective the same as Spherical Perspective?
No. The terms overlap, but 360 degrees principally identifies angular coverage. Spherical Perspective identifies a perspective system or mapping organised in relation to a spherical field or surface. A spherical perspective may represent only a hemisphere or may extend to the complete sphere.
What is an equirectangular 360 image?
An equirectangular image maps a complete spherical scene onto a flat rectangular image. A full spherical image normally represents 360 degrees horizontally by 180 degrees vertically and has a 2:1 aspect ratio.
Why does an equirectangular image look distorted?
The complete spherical field has been transformed onto a flat rectangle. The mapping distributes spherical directions unevenly across the plane and produces substantial stretching towards the upper and lower limits.
Can a fisheye lens capture 360 degrees?
A fisheye lens can capture an extremely wide field and may cover most or all of a hemisphere. Multiple suitable fisheye images or camera views can be combined to represent a complete surrounding sphere.
What is the difference between a 360 panorama and Virtual Reality?
A fixed 360 panorama normally allows viewing in different directions from one recorded station point. A fully modelled Virtual Reality environment can additionally allow the observer to move to new station points and generate new perspective views dynamically.
Is 360 Degree Perspective stereoscopic?
Not necessarily. A 360-degree panorama can be entirely monocular. Stereoscopic and binocular information may be added, but angular coverage and stereoscopy are separate properties.
How is five-point perspective related to 360 Degree Perspective?
Five-point perspective can represent approximately one hemispherical or 180-degree field. It provides a wide spherical view but does not include the complete surrounding sphere.
How is six-point perspective related to 360 Degree Perspective?
Six-point perspective adds the direction behind the observer and provides a graphical method for representing the complete surrounding directional world.
Is a 360-degree image physically three-dimensional?
Not necessarily. A complete spherical panorama can be stored as a flat 2D image while representing a three-dimensional surrounding scene. Image dimensionality and angular coverage are separate characteristics.
Is 360 Degree Perspective a Perspective Category?
No. Within Perspective Category Theory, 360 degrees describes an angular or directional property of a perspective view or system. Such systems can operate through Optical, Mathematical, Graphical, Instrument, New Media and other Perspective Categories.
360 Degree Perspective within the Wider Field of Perspective
360 Degree Perspective extends the idea of perspective beyond the ordinary frontal view by recognising that spatial reality surrounds the observer in every direction.
A complete surrounding view can be captured through circular, cylindrical or spherical arrangements, represented graphically through multi-point systems, photographed using specialised optical systems, transformed mathematically into flat panoramic images or explored interactively through digital media.
Yet the term “360” by itself does not determine the complete geometry of the perspective system. We must still ask whether the viewpoint is fixed or moving, whether the field is merely horizontal or fully spherical, whether the image is monocular or binocular, and whether changing viewing position produces genuinely new perspective information.
Seen in this wider context, 360 Degree Perspective is the study of how the complete directional environment surrounding an observer or object can be viewed, captured, mapped, represented, displayed and explored.