Reflections have a long history in computer graphics, as they are important for conveying a sense of realism as well as depth and proportion. Their implementations come with a multitude of difficulties, and each solution typically has various trade-offs.
Approaches highly depend on the geometry of the reflective surface since curved reflectors are usually more difficult to portray accurately. Techniques can typically be categorized by whether they work with the actual geometry of
the reflected objects or with an image of these objects. For curved surfaces, image-based techniques are usually preferred, whereas for planar surfaces the reflected geometry can be used more easily because of the lack of distortion. With current advances in graphics hardware technology, ray tracing is also becoming more viable for real-time applications. Many modern solutions often combine multiple approaches to form a hybrid technique.
In this paper, we give an overview of the techniques used in computer graphics applications to create real-time reflections. We highlight the trade-offs that have to be dealt with when choosing a particular technique, as well as their ability to produce interreflections. Finally, we describe how contemporary state-of-the-art rendering engines deal with reflections.Zrcaljenja imaju dugu povijest primjene u računalnoj grafici zbog njihove važnosti u prenošenju realističnosti prikaza te prikaza dubine i omjera na slikama. Pri implementaciji zrcaljenja dolazimo do raznih teškoća i svako novo rješenje često imaju svoju cijenu. Pristupi implementacije ovise o geometriji plohe na kojoj leži prikaz, Što je ploha zakrivljenija, to je teže postići vjerni prikaz. Tehnike možemo kategorizirati u one koje rade sa stvarnom geometrijom zrcaljenih objekata te one koje rade samo sa slikama objekata. Kod zakrivljenih ploha koriste se tehnike bazirane na slikama, dok se kod ravninskih ploha koristi zrcaljena geometrija jer nema iskrivljenja. Zahvaljujući trenutnom razvoju tehnologije grafičkih hardvera, metoda praćenja zraka (ray tracing) postaje sve isplativija u real-time primjeni. Mnoga moderna rješenja kombiniraju razne pristupe i dolazi do hibridnih tehnika.
U ovom radu dajemo pregled tehnika korištenih u primjeni računalne grafike za postizanje real-time zrcalnih slika. Naglašavamo probleme koji nastaju pri korištenju određene tehnike te njihove mogućnosti u pogledu stvaranja međuzrcaljenja. Naposljetku, opisujemo kako moderni alati za renderiranje rješavaju probleme zrcaljenj
