Technology and methods for deferred synthesis of 4K stereo clips for complex dynamic virtual scenes

The paper considers the task of capturing controlled by a researcher stereo visualization of a complex dynamic virtual scene into a stereopair videosequence (stereoclip) of ultrahigh resolution. An efficient technology of deferred synthesis of stereoclips is proposed. It allows to create stereoclips without violating a real-time visualization. The technology includes real-time constructing of scenario of visualization process and offline-transforming the scenario to stereoclip. In the paper methods to realize these stages are considered for the task of stereovisualization of saturation isosurface of displacing liquid. For this, original file format «scr» of visualization scenario is developed, based on «chunk» data structures. The format developed provides a compact representation of neighboring repeated frames. Transforming scenario file to a sequence of 4K-stereopairs is carried out by means of an offscreen rendering of virtual scene, and adding stereopairs to a stereoclip is performed using a number of open-source FFmpeg libraries designed for processing digital video content. For video recording media container MP4 and video compressing standard H.264 are used. Proposed technologies and methods of 4K-stereoclips deferred synthesis are implemented in a program complex for visualization of simulation results of unstable oil displacement from porous media. By means of the program complex a 4K-stereoclip is created, which illustrates the evolution of the isosurface during the process of unstable oil displacement. The approbation results confirmed the adequacy of the proposed solution to the task. Developed solutions can be used in virtual laboratories, in constructing of virtual environment systems and scientific visualization systems, in educational applications etc.