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Special collections of the National and University Library (NUK) hide a lot of items of precious value. The Slovenian cultural heritage is stored on paper or on other media as a part of the library´s manuscripts, incunabula and rare books collection, old prints collection, maps and pictorial collection, music collection, ephemera collection, serials collection, and Slovenian diaspora publications collection. Only a small part of the treasures is temporary revealed to the public on special exhibitions. The idea of virtual exhibitions of library treasures was born in 2005. The library aimed to exhibit precious items of special collections of high historical or artistic value. In 2008 the first two virtual exhibitions were created in-house offering access to the rich collections of old postcards of Ljubljana at the beginning of 20th century kept in the maps and pictorial collection of NUK. They were soon followed by other virtual exhibitions. At the beginning they were organised in the same way as physical exhibitions, afterwards different programs were used for creation of special effects (for ex. 3D wall). About two years ago it was decided that the creation of virtual exhibitions will be simplified. Files of digitised and borndigital library materials in JPG format are imported to MS PowerPoint 2010. Each JPG file is now formatted by adding a frame, a description ... to the slides which are saved as JPG files. The last step is the import of JPG files into Cooliris application used for NUK web exhibitions. In the paper the virtual exhibition design and creation, the technical pount of view and criteria for the selection of exhibition content are explained following the example of the virtual exhibitions the Old postcards of Ljubljana, Photo Ateliers in Slovenia, a collection of photographs Four seasons by Fran Krašovec and photos of Post-Earthquake Ljubljana in 1895. Razstavna dejavnost Narodne in univerzitetne knjižnice (dalje NUK) je ena izmed prednostnih nalog na področju promocije knjižničnega gradiva. Na dokumentarno, zgodovinsko ali umetniško vrednost gradiva sodelavci uporabnike opozarjajo s klasičnimi razstavami, ki jih postavijo v razstavnih prostorih NUK ter z oblikovanjem oz. izvedbo virtualnih razstav na spletni strani NUK in na portalu Digitalne knjižnice Slovenije (dalje dLib.si). Prispevek je razdeljen na dva dela. V prvem delu je opisan pomen virtualnih razstav, njihove prednosti in slabosti v primerjavi s klasičnimi razstavami in primeri tujih in domačih virtualnih razstav, vključno z razstavami v NUK. V drugem delu prispevka je predstavljen postopek uporabe programskega orodja, ki ga sodelavci v NUK uporabljajo za izvedbo virtualne razstave od leta 2011 dalje.

DEDI stands for the Digital Encyclopaedia of natural and Cultural Heritage in Slovenia which was a result of two prototype research and development projects DEDI and DEDI II in the period between 2008 and 2010. The two projects were co-financed by the Ministry of Higher Education, Science and Technology and the European Regional Development Fund in the frame of research and development projects e-content and e-services. DEDI is the first attempt of multimediarich digital representation of Slovenian natural and cultural heritage on a common web site offering verifiable, qualitative and complex content to a wide range of general public. Digital content (text, video records, audio records, photographs) is enriched by 2-dimensional and/or 3-dimensional visualisation of geographical data or even by 4-dimensional models with time component. 4D models combine 3D models with the time dimension. Thus it is possible to simulate the past, the current and the future condition of natural and cultural heritage objects, their changes, growth, deterioration or oscillation. 3D and 4D models are more explanatory, plastic and attractive to the unprofessional public thus increasingthe interest in the digital encyclopaedia. Technological solutions for the project were developed by the consortium partners in the field of web technologies who succeeded to locate all immovable natural and cultural heritage objects. The Google maps web platform is normally used for 2D representations but it is often too complex to represent a large amount of data. In order to meet the needs of the digital encyclopaedia data need to be structured and linked which is one of the main advantages of Geopedia, an interactive atlas which enables active user participation in adding and editing information on Slovenia. A 3D visualisation tool Gaea+ is used for real time visualisation of 3D models offering user-friendly presentation of any geospatial information and an interactive walk-through allowing users to move in 3D space. Many advanced DEDI files (dynamic multimedia representations or dediteka) of some natural and cultural objects of national importance were created. An advanced dediteka combines several object representation into interactive non-linear stories and upgrade them in various ways. The advanced dediteka "The story of Martin Krpan and his age" is a digitised story of Martin Krpan written in 1858 by Fran Levstik enriched by the audio record. The user can read a story and listen to the Slovenian language of the Levstik´s time.Two main digitisation criteria of equal importance were used for the selection of natural and cultural heritage objects: geographical area and the content value. The article describes a 4D simulation of the urban growth of Ljubljana and the virtual reconstruction of the Žiga Zois study room. 4D simulation of the growth of Ljubljana is based on historical and contemporary sources, i.e. 3D visualisation with time component. It is based on old city plans, digitised terrain model, national topographic maps, contemporary city plan and cadastre. 3D terrain models of buildings are enriched by a city plan of a specific period of time. The historical growth of the city is represented by a 2D dynamic map with floor plans and isochrones. 3D scanned exterior of the Žiga Zois Mansion is represented as well as a part of the interior with the virtual reconstruction of his study room where the collection of minerals was kept. Some specimens are 3D scanned. A few items of his literary opus are digitised, too. V okviru projekta Digitalne enciklopedije naravne in kulturne dediščine na Slovenskem, DEDI II, je bil prikaz digitalnih vsebin običajnih formatov (tekst, video, zvočni zapis in fotografija) obogaten z geografsko informacijo, ki je hkrati prikazana dvo- in/ali trirazsežnostno, lahko pa tudi štirirazsežnostno s časovno komponento. 4D modeli prikazujejo 3D modele objektov v času, kar pomeni, da lahko simuliramo pretekla, sedanja in prihodnja stanja objektov, njihovo spreminjanje, rast, upadanje ali nihanja. 3D in 4D modeli povečajo nazornost, plastičnost in privlačnost prikaza objektov laičnim uporabnikom, s tem pa se poveča zanimanje za enciklopedijo. V prispevku sta podrobneje predstavljena 4D simulacija rasti mesta Ljubljane in virtualna rekonstrukcija kabineta Žige Zoisa. Za Ljubljano je narejena 4D simulacija rasti mesta na osnovi zgodovinskih in sodobnih virov, tj. 3D prostorski prikaz s časovno komponento. Kot vir so uporabljeni stari načrti Ljubljane, digitalni model reliefa, državne topografske karte in sodobni mestni načrti ter podatki katastra stavb. Stavbe so prikazane tridimenzionalno na modelu reliefa , ki je za vsako dobo razvoja mesta prekrit s karto tistega obdobja. Rast mesta je dvodimenzionalno dinamično prikazana tudi na karti s prikazom naraščanja števila tlorisnih prikazov stavb in z izohronami rasti mesta. Za Zoisovo palačo je izdelan 3D prikaz skenirane zunanjosti ter del notranjosti hiše z virtualno rekonstrukcijo njegovega kabineta, v katerega je umeščena zbirka mineralov. Nekaj primerkov iz zbirke je tudi 3D skeniranih, prav tako je digitaliziranih nekaj del iz Zoisove pisne zapuščine.

The project entitled "Digital encyclopaedia of Slovenian natural and cultural heritage" (DEDI II) has been evolved as a prototype research and development project (2009-2010). It represents the first attempt of multimedia-rich digital representation of Slovenian natural and cultural heritage by the means of interdisciplinary work of different cultural and educational institutions. Verifiable, qualitative and complex content of four types of heritage is co-located on a common site (immovable, movable, vivid and natural heritage) with the goal to promote the heritage and educate the general public, as well as to encourage the public to create tomorrow's heritage. A new detailed thesaurus was constructed enabling the classification of different kinds of heritage.It merges the established and newly created taxonomies of each type of heritage. To ensure the quality of published contents, the professional Editorial Board has been established. The National and University Library of Slovenia (NUK), one of the fundamental institutions for collecting and keeping the written cultural heritage of Slovenia, has already participated in the conception of the first project scheme. In the second part of the DEDI project, NUK contributed a number of digitalized books selected on the basis of their historical and literary importance. Digitalized books were published on the DEDI portal under the movable cultural heritage taxonomy. Projekt Digitalna enciklopedija naravne in kulturne dediščine na Slovenskem (DEDI II) je prototipni raziskovalno-razvojni projekt (2009-2010) in predstavlja prvi poskus večmedijske digitalne predstavitve slovenske naravne in kulturne dediščine in interdisciplinarno združuje delo različnih kulturnih in izobraževalnih institucij, s čimer so bile na enem mestu zbrane verodostojne, kakovostne in kompleksne vsebine štirih vrst dediščine (nepremične, premične, žive kulturne ter naravne) z namenom, izobraževati in približati dediščino najširši javnosti in jo spodbuditi k soustvarjanju jutrišnje dediščine. Za potrebe projekta je bil narejen podroben tezaver dediščine, ki združuje do sedaj znane in na novo dopolnjene taksonomije za posamezne vrste de-diščine. Ustanovljena je bila strokovna uredniška skupina, ki skrbi za kakovost objavljenih vsebin. Narodna in univerzitetna knjižnica (NUK) je kot ena temeljnih ustanov za hranjenje in zbiranje slovenske pisne kulturne dediščine sodelovala že pri zasnovi pilotnega projekta DEDI, v nadaljevalnem projektu pa je z digitalizacijo pomembnih zgodovinskih in literarnih del v okviru premične dediščine prispevala k primerni zastopanosti virtualne knjige na spletnem portalu DEDI.