**2. Related work**

There are many works related to 3D computer graphics in virtual reality. Some of the works focus on different virtualization algorithms, others try a new methodology of improving realistic look while maintaining the smoothness of application. Related work below simply focuses on new methodologies or approaches to 3D computer graphics or comparing them.

Chen in [5] describes the rapid creation of photorealistic virtual reality content with consumer depth cameras. Work focuses on the demonstration of a complete end-to-end pipeline for the capture, processing, and rendering of view-dependent 3D models in virtual reality from a single consumer-grade RGB-D camera. The result of this pipeline is a 3D mesh with view-dependent textures suitable for real-time rendering in virtual reality. Progressive feedback point cloud rendering for virtual reality display is the aim of [6]. Work presents a novel approach to a progressive feedback-driven rendering algorithm. This algorithm uses reprojections of past views to accelerate the reconstruction of the current view. The presented method is tested against previous methods, showing improvements in both rendering quality and interactivity. In the [7] is indicated virtual content creation using dynamic omnidirectional texture synthesis. This work proposes optimization that synthesizes a high resolution view-dependent texture map for any virtual camera location. Synthetic textures are generated by uniformly sampling a spherical virtual camera set surrounding the virtual object, thereby enabling efficient real-time rendering for all potential viewing directions.

The paper [8] describes three views of virtual reality: non-immersive virtual reality, and it discusses the advantages and applications of non-immersive VR systems. Immersive and non-immersive VR systems are compared and hybrid possibilities are reviewed.

Kautz et al. [9] present new algorithms and techniques for the acquisition and realtime interaction with complex textured 3D objects and shows how these results can be seamlessly integrated with previous work into a single framework for the acquisition, processing, and interactive display of high-quality 3D models. In addition to pure geometry, such algorithms also have to take into account the texture of an object and its reflectance behavior. The research [10] presents a novel 3D user interface for the immersive design review. This research focuses on the development of a novel immersive user interface, a smart 3D disk with a set of widgets. During the immersive sessions, the user can activate functionalities using cost-effective pointing devices and the conceived 3dUIs projected into the more complex CAD functionalities such as surfaces shape modification.
