English World 2 Unit 9
Hien Mondesir
I agree that the unit should a a simple configuration on the renderer, many tools and engines use other units as well for various reasons. For instance 1 centimeter = 1 unit is a common default too (Unreal Engine, C4D e.g) while UE also has a configuration option, especially for the web it turned out to be more stable regarding precision in various cases for shader, for large numbers reaching the end on the other hand then only by using a wrapping space or different world matrix treatment, but then there is basically no early limit on either end anymore, especially not on large numbers.
2), I tried to convert one codebase from kilometers to meters, and this introduced a ripple effect of problems (mis-rendering, then having to tweak light biases, camera frustum near/far values, etc, etc) causing too much work (I gave up, no physical lighting in that app for now).
3), if we start from scratch on some new project, we can definitely try to uphold a mapping of some-unit-to-meters for all objects in the app, but that is also going to be cumbersome and tedious compared to a single option that tweaks the physically-correct lighting math.
In the following picture the square is currently 500,000cm X 500,000cm; can I change the measurement from cm to meters (500,000 cm to 500,000 m) but have it take up the same space in the game world (still 500,000 game units)?
Is Wrong idea to change scale inside the UE4 becouse if you after want to make our use assets from our for marketplace your wrong scale generate problems for you our your clients.
I suggest to change your setting in your 3D modelling software
Here tutorial to change scale in maya and maya lt: UE4/Maya: Set Up Grid in MayaLT/Maya to Match Unreal Engine 4 - YouTube
Here for 3ds max - YouTube
If you need this rescale to other 3D software you found all in youtoube tutorials by searching
Name of Software + to UE4 Scale
In other words if I have a square that is 10 units by 10 units (by default this would be 10 cm by 10 cm). Can I change something in the engine so that those 10 units can be changed to meters or some other measurement of distance?
So I could change this square so it is still 10 by 10 units but now reads as being 10 by 10 meters?
If all thinks was big and only characeters was little why dont build the world in normal scale and after scale manualy only caracters?
Aniway all objects you need to build in 3rd part 3D software like maya, 3ds max in this programs you just can set modelling size to meters and when import in UE4 in automatically bumped x 100
The International System of Units, internationally known by the abbreviation SI (from French Systme international d'units), is the modern form of the metric system and the world's most widely used system of measurement. Coordinated by the International Bureau of Weights and Measures (abbreviated BIPM from French: Bureau international des poids et mesures) it is the only system of measurement with official status in nearly every country in the world, employed in science, technology, industry, and everyday commerce.
The SI comprises a coherent system of units of measurement starting with seven base units, which are the second (symbol s, the unit of time), metre (m, length), kilogram (kg, mass), ampere (A, electric current), kelvin (K, thermodynamic temperature), mole (mol, amount of substance), and candela (cd, luminous intensity). The system can accommodate coherent units for an unlimited number of additional quantities. These are called coherent derived units, which can always be represented as products of powers of the base units. Twenty-two coherent derived units have been provided with special names and symbols.
The seven base units and the 22 coherent derived units with special names and symbols may be used in combination to express other coherent derived units. Since the sizes of coherent units will be convenient for only some applications and not for others, the SI provides twenty-four prefixes which, when added to the name and symbol of a coherent unit produce twenty-four additional (non-coherent) SI units for the same quantity; these non-coherent units are always decimal (i.e. power-of-ten) multiples and sub-multiples of the coherent unit.
The current way of defining the SI is a result of a decades-long move towards increasingly abstract and idealised formulation in which the realisations of the units are separated conceptually from the definitions. A consequence is that as science and technologies develop, new and superior realisations may be introduced without the need to redefine the unit. One problem with artefacts is that they can be lost, damaged, or changed; another is that they introduce uncertainties that cannot be reduced by advancements in science and technology.
Like all metric systems, the SI uses metric prefixes to systematically construct, for the same physical quantity, a set of units that are decimal multiples of each other over a wide range. For example, driving distances are normally given in kilometres (symbol km) rather than in metres. Here the metric prefix 'kilo-' (symbol 'k') stands for a factor of 1000; thus, 1 km = 1000 m.
For each base unit the BIPM publishes a mises en pratique, (French for 'putting into practice; implementation',[16]) describing the current best practical realisations of the unit.[17] The separation of the defining constants from the definitions of units means that improved measurements can be developed leading to changes in the mises en pratique as science and technology develop, without having to revise the definitions.
The only other types of measurement system that still have widespread use across the world are the imperial and US customary measurement systems. The international yard and pound are defined in terms of the SI.[22]
The SI is regulated and continually developed by three international organisations that were established in 1875 under the terms of the Metre Convention. They are the General Conference on Weights and Measures (CGPM[b]),[26] the International Committee for Weights and Measures (CIPM[c]), and the International Bureau of Weights and Measures (BIPM[d]). All the decisions and recommendations concerning units are collected in a brochure called The International System of Units (SI),[1] which is published in French and English by the BIPM and periodically updated. The writing and maintenance of the brochure is carried out by one of the committees of the CIPM. The definitions of the terms "quantity", "unit", "dimension", etc. that are used in the SI Brochure are those given in the international vocabulary of metrology.[27] The brochure leaves some scope for local variations, particularly regarding unit names and terms in different languages. For example, the United States' National Institute of Standards and Technology (NIST) has produced a version of the CGPM document (NIST SP 330) which clarifies usage for English-language publications that use American English.[4]
Electric current with named unit 'ampere' was chosen as the base unit, and the other electrical quantities derived from it according to the laws of physics.When combined with the MKS the new system, known as MKSA, was approved in 1946.[4]
In 1948, the 9th CGPM commissioned a study to assess the measurement needs of the scientific, technical, and educational communities and "to make recommendations for a single practical system of units of measurement, suitable for adoption by all countries adhering to the Metre Convention".[36] This working document was Practical system of units of measurement. Based on this study, the 10th CGPM in 1954 defined an international system derived six base units: the metre, kilogram, second, ampere, degree Kelvin, and candela.
Many non-SI units continue to be used in the scientific, technical, and commercial literature. Some units are deeply embedded in history and culture, and their use has not been entirely replaced by their SI alternatives. The CIPM recognised and acknowledged such traditions by compiling a list of non-SI units accepted for use with SI,[5] including the hour, minute, degree of angle, litre, and decibel.
Although the term metric system is often used as an informal alternative name for the International System of Units,[43] other metric systems exist, some of which were in widespread use in the past or are even still used in particular areas. There are also individual metric units such as the sverdrup and the darcy that exist outside of any system of units. Most of the units of the other metric systems are not recognised by the SI.
Sometimes, SI unit name variations are introduced, mixing information about the corresponding physical quantity or the conditions of its measurement; however, this practice is unacceptable with the SI. "Unacceptability of mixing information with units: When one gives the value of a quantity, any information concerning the quantity or its conditions of measurement must be presented in such a way as not to be associated with the unit."[5]Instances include: "watt-peak" and "watt RMS"; "geopotential metre" and "vertical metre"; "standard cubic metre"; "atomic second", "ephemeris second", and "sidereal second".
Fig. 1. Portrait of Prince Muhammad Buland Akhtar, known as Achhe Sahib, at Prayer: Folio from an album, 17th century; painter: Hujraj; India; ink and opaque watercolor on paper; 13 1/16 x 9 in. (33.2 x 22.9 cm); The Metropolitan Museum of Art, New York, Rogers Fund, 1925 (25.138.2)
This illustration shows a Mughal prince praying on a mat that features an arch recalling the shape of a prayer niche (mihrab), symbolic of the gateway to Paradise. The prince is barefoot as a gesture of humility before God. The simplicity of his surroundings is an indication of piety; the emphasis here is on the prince's spiritual nature rather than the opulence of his costume or surroundings (which is the case in many royal Mughal portraits; see The Mughal Court and the Art of Observation).