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<article article-type="research-article" dtd-version="1.3" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xml:lang="ru"><front><journal-meta><journal-id journal-id-type="publisher-id">omna</journal-id><journal-title-group><journal-title xml:lang="ru">Омский научный вестник</journal-title><trans-title-group xml:lang="en"><trans-title>Omsk Scientific Bulletin</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">1813-8225</issn><issn pub-type="epub">2541-7541</issn><publisher><publisher-name>Омский государственный технический университет</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.25206/1813-8225-2024-191-48-55</article-id><article-id custom-type="edn" pub-id-type="custom">TJTAFT</article-id><article-id custom-type="elpub" pub-id-type="custom">omna-159</article-id><article-categories><subj-group subj-group-type="heading"><subject>Research Article</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="ru"><subject>МАШИНОСТРОЕНИЕ</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>MECHANICAL ENGINEERING</subject></subj-group></article-categories><title-group><article-title>Качественная модификация геометрически ориентированных методов построения пространственных кривых в C3D FairCurveModeler</article-title><trans-title-group xml:lang="en"><trans-title>Qualitative modification of geometrically oriented methods for constructing spatial curves in C3D FairCurveModeler</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-4352-3381</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Муфтеев</surname><given-names>В. Г.</given-names></name><name name-style="western" xml:lang="en"><surname>Mufteev</surname><given-names>V. G.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Муфтеев Валериян Гайнизаманович - кандидат технических наук, ведущий математик-программист ООО «СЗД ЛАБС», SPIN-код: 7361-8032. AuthorID (РИНЦ): 1006623.</p><p>Москва</p></bio><bio xml:lang="en"><p>Mufteev Valeriyan Gajnizamanovich - Candidate of Technical Sciences, Leading Mathematician Programmer, LLC «C3D Labs», SPIN-code: 7361-8032. AuthorID (RSCI):1006623</p><p>Moscow</p></bio><email xlink:type="simple">muftejev@mail.ru</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Зиганшина</surname><given-names>Ф. Т.</given-names></name><name name-style="western" xml:lang="en"><surname>Ziganshina</surname><given-names>F. T.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Зиганшина Файруза Тахваловна - кандидат физико-математических наук, доцент (Россия), и.о. заведующего кафедрой «Комплексный инжиниринг и компьютерная графика» УГНТУ, SPIN-код: 6326-3600. AuthorID (РИНЦ): 866017. AuthorID (SCOPUS): 57215302498.</p><p>Уфа</p></bio><bio xml:lang="en"><p>Ziganshina Fairuza Tahvalovna - Candidate of Physical   and          Mathematical         Sciences,     Associate Professor, Head of Integrated Engineering and Computer Graphics Department, USPTU, SPIN-code: 6326-3600. AuthorID (RSCI): 866017. AuthorID (SCOPUS): 57215302498.</p><p>Ufa</p></bio><email xlink:type="simple">fairusa85@mail.ru</email><xref ref-type="aff" rid="aff-2"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Гумеров</surname><given-names>В. И.</given-names></name><name name-style="western" xml:lang="en"><surname>Gumerov</surname><given-names>V. I.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Гумеров Вадим Ильдарович - независимый исследователь.</p><p>Уфа</p></bio><bio xml:lang="en"><p>Gumerov Vadim Ildarovich - Independent Researcher.</p><p>Ufa.</p></bio><email xlink:type="simple">gumerov2008@mail.ru</email></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Набиев</surname><given-names>Р. И.</given-names></name><name name-style="western" xml:lang="en"><surname>Nabiev</surname><given-names>R. I.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Набиев Рифкат Ильшатович - кандидат технических наук, доцент кафедры «Эксплуатация наземного транспорта в нефтегазовой промышленности и строительстве (ЭНТ)» УГНТУ, SPIN-код: 4883-7004. AuthorID (РИНЦ): 391526.</p><p>Уфа</p></bio><bio xml:lang="en"><p>Nabiev Rifkat Ilshatovich - Candidate of Technical Sciences, Associate Professor, Associate Professor of Management and Service in Technical Systems Department, USPTU, SPIN-code: 4883-7004. AuthorID (RSCI): 391526.</p><p>Ufa</p></bio><email xlink:type="simple">dizain55@yandex.ru</email><xref ref-type="aff" rid="aff-2"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Ефимова</surname><given-names>Г. М.</given-names></name><name name-style="western" xml:lang="en"><surname>Efimova</surname><given-names>G. M.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Ефимова Гульсия Маратовна - старший преподаватель кафедры «Комплексный инжиниринг и компьютерная графика» УГНТУ, SPIN-код: 3898-7937. AuthorID (РИНЦ): 836063.</p><p>Уфа</p></bio><bio xml:lang="en"><p>Efimova Gulsia Maratovna - Senior Lecturer of Integrated          Engineering and    Computer    Graphics Department, USPTU, SPIN-code: 3898-7937. AuthorID (RSCI): 836063.</p><p>Ufa</p></bio><email xlink:type="simple">gylsia@mail.ru</email><xref ref-type="aff" rid="aff-2"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru">ООО «СЗД ЛАБС»<country>Россия</country></aff><aff xml:lang="en">LLC «C3D Labs»<country>Russian Federation</country></aff></aff-alternatives><aff-alternatives id="aff-2"><aff xml:lang="ru">Уфимский государственный нефтяной технический университет<country>Россия</country></aff><aff xml:lang="en">Ufa State Petroleum Technological University<country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2024</year></pub-date><pub-date pub-type="epub"><day>30</day><month>09</month><year>2024</year></pub-date><volume>0</volume><issue>3</issue><fpage>48</fpage><lpage>55</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Муфтеев В.Г., Зиганшина Ф.Т., Гумеров В.И., Набиев Р.И., Ефимова Г.М., 2024</copyright-statement><copyright-year>2024</copyright-year><copyright-holder xml:lang="ru">Муфтеев В.Г., Зиганшина Ф.Т., Гумеров В.И., Набиев Р.И., Ефимова Г.М.</copyright-holder><copyright-holder xml:lang="en">Mufteev V.G., Ziganshina F.T., Gumerov V.I., Nabiev R.I., Efimova G.M.</copyright-holder><license license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>This work is licensed under a Creative Commons Attribution 4.0 License.</license-p></license></permissions><self-uri xlink:href="https://onv.omgtu.ru/jour/article/view/159">https://onv.omgtu.ru/jour/article/view/159</self-uri><abstract><p>В статье приводится подробный алгоритм улучшения команды C3D FairCurveModeler построения пространственной кривой класса F с аппроксимацией посредством рациональной кубической сплайновой кривой (NURBzSкривой) и с аппроксимацией посредством B-сплайновой кривой высокой степени. Улучшение достигается за счёт оптимизации структуры пространственного Геометрического Определителя Эрмита при определении его на пространственной виртуальной кривой (V-кривой), построенной на множестве К2П (конических кривых) двойного соприкосновения. Структура Геометрического Определителя Эрмита улучшается в операции определения касательной в опорной точке путем переопределения направления касательной с учетом пространственных направлений касательных в концевых точках сегмента К2П при построении множества К2П двойного соприкосновения.</p><p>Для демонстрации модифицированного метода в работе показывается:</p><p>1)       улучшение качества конической спирали, моделируемой штатной командой _Helix CAD-систем ZWCAD, BricsCAD, AutoCAD с помощью команды C3D FairCurveModeler построения NURBzS-кривой;</p><p>2)       построение B-сплайновой кривой 8-й степени на точках конической спирали командой C3D FairCurveModeler и сравнение с аналогичными построениями в CAD-системах, ‘AliasDesignStudio’, NX, декларирующих возможность построения кривых высокого качества (класса A).</p></abstract><trans-abstract xml:lang="en"><p>The article provides a detailed algorithm for improving the C3D FairCurveModeler commands for constructing a class F spatial curve with approximation by a rational cubic spline Bezier curve (NURBzS-curve) and with approximation by a highdegree B-spline curve. The improvement is achieved by optimizing the structure of the Hermite spatial Geometric Determinant when defining it on a spatial virtual curve (V-curve) created on a set of double-tap conical curves. The structure of the Hermite Geometric Determinant is improved by changing the direction of the tangents, taking into account the spatial directions of the tangents at the end points of the conic segments at the step of constructing the set of double-tap conical curves.</p><p>To demonstrate the modified method, the work shows</p><p>1)       Improving the quality of a conical spiral modeled by the regular _Helix command of CAD systems ZWCAD, BricsCAD, AutoCAD by using the C3D FairCurveModeler command for creating a NURBzS-curve.</p><p>2)       Construction of a B-spline curve of the 8th degree on the points of a conical spiral by the C3D FairCurveModeler command and comparison with similar constructions in the CAD systems 'Rhino Ceros D', 'Alias Design Studio', NX which declare the construction of high quality curves (class A).</p></trans-abstract><kwd-group xml:lang="ru"><kwd>пространственная сплайновая кривая</kwd><kwd>C3D FairCurveModeler</kwd><kwd>геометрическое ядро C3D</kwd><kwd>C3D FairCurveModeler</kwd><kwd>К2П</kwd><kwd>конические кривые</kwd><kwd>кривые класса A</kwd><kwd>кривые класса F</kwd></kwd-group><kwd-group xml:lang="en"><kwd>Spatial spline curve</kwd><kwd>C3D FairCurveModeler</kwd><kwd>C3D geometric kernel</kwd><kwd>conic curves</kwd><kwd>class A curves</kwd><kwd>class F curves</kwd></kwd-group></article-meta></front><back><ref-list><title>References</title><ref id="cit1"><label>1</label><citation-alternatives><mixed-citation xml:lang="ru">Schoenberg I. 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