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Описан высокоэффективный алгоритм экспорта BIM-моделей из BIM-пакета Autodesk Revit с целью построения интерактивной визуализации в виртуальной и дополненной реальности. Для демонстрации эффективности алгоритма выполнена его апробация на информационной модели с высокой степенью детализации. Проведен сравнительный анализ с различными программными комплексами, автоматизирующими экспорт BIM-моделей Purpose: built-in tools of software packages, such as Autodesk Revit or Renga do not allow rendering realistic BIM-model. Visualization tools of various graphical packages (Autodesk 3ds Max, Blender, Cinema 4D etc.) are mostly using ray tracing, which makes it almost impossible to change the camera angle, geometry materials, lighting parameters etc. in real-time. Therefore, an interactive BIM-model visualization is needed. Such visualization achieves its maximum efficiency when virtual and augmented reality technologies are employed, which allow studying the designed object in volume but requires preliminary processing for model optimization. The purpose of this work is the development of an algorithm for preparation of BIM-model for interactive visualization in virtual and augmented reality. Methodology: processing of BIM-models developed in BIM-modelling software package Autodesk Revit is considered (but main concepts could be applied to other BIM-modelling software packages). Autodesk 3ds Max was selected for model’s geometry processing. Various features of BIM-model export were examined, as well as available ways for optimization of geometry of a building, BIMmodel component structuring and material management. A literature on the subject of the study was analyzed. Findings: a universal algorithm has been developed allowing, on the basis of the information model of the building, in the shortest possible time to prepare a highly optimized 3D model, ready for interactive visualization Value: the developed algorithm can be applied to a BIM-model of any complexity. High level of model optimization allows performing realistic visualization with various interactive components thereby increasing overall realism of interactive visualization

Предложен ряд высокопроизводительных алгоритмов компьютерного моделирования оболочечных конструкций (или оболочек) с использованием метода Ритца. Эти алгоритмы могут быть применены как при реализации метода Ритца в общем случае, так и при расчете напряженно-деформированного состояния (НДС) оболочечных конструкций. Описывается применение графических ускорителей в задаче расчета НДС. Предложенные алгоритмы включены в ранее разработанное авторами программное обеспечение моделирования НДС-оболочек. Для их апробации проведен вычислительный эксперимент. Исследование алгоритмов показало, что они позволяют повысить производительность расчета на несколько порядков в сравнении с неоптимизированной версией программного обеспечения. Purpose. The Ritz method often used for calculation of thin-shell structures allows performing a transition from a variational problem to the problem of multidimensional function minimization. The main disadvantage of this method is the nonlinear increase of computational complexity with the increase of terms amount in approximation functions. This fact makes it difficult or impossible to obtain results in cases where high solution accuracy is required or when a shell structure with complex geometry is investigated. At the same time, studies aimed at improving computing performance of the Ritz method, especially in problems of shell computer modelling, are rare. The purpose of this work is to develop algorithms for high-performance calculation of the stress-strain state (SSS) of thin-walled shell structures using the Ritz method. Methodology. Analysis of the current state in the field of computer modelling for shell structures was performed. Shell SSS calculation schemes are studied. Algorithms are proposed to improve computer modelling performance by using different mathematical model properties, multi-core CPUs and graphics accelerators. Findings. Described algorithms were implemented in shell SSS modelling software previously developed by the authors. Tests of the performance have shown that they improve the calculation time by several orders compared with the non-optimized version of the software. Originality/Value. New effective algorithms have been developed for modelling the SSS of thin- walled shell structures using the Ritz method. These algorithms can be applied not only to the calculation of shells, but to any other application of Ritz method to the problem of functional minimization.