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In the present paper we demonstrate a proof of concept of such a unification using subdivision surfaces and the enabling technology of isogeometric analysis. In particular, we present a complete pipeline to convert CAD models into smooth <jats:inline-formula><jats:alternatives><jats:tex-math>$$G^1$$<\/jats:tex-math><mml:math xmlns:mml=\"http:\/\/www.w3.org\/1998\/Math\/MathML\">\n                  <mml:msup>\n                    <mml:mi>G<\/mml:mi>\n                    <mml:mn>1<\/mml:mn>\n                  <\/mml:msup>\n                <\/mml:math><\/jats:alternatives><\/jats:inline-formula> spline representations, which are suitable for isogeometric analysis. Starting from a CAD boundary representation of a mechanical object, we perform an <jats:italic>automatic<\/jats:italic> control cage extraction by means of quadrangular faces, such that its limit Catmull-Clark subdivision surface approximates accurately the input model. We then compute a basis of the <jats:inline-formula><jats:alternatives><jats:tex-math>$$G^1$$<\/jats:tex-math><mml:math xmlns:mml=\"http:\/\/www.w3.org\/1998\/Math\/MathML\">\n                  <mml:msup>\n                    <mml:mi>G<\/mml:mi>\n                    <mml:mn>1<\/mml:mn>\n                  <\/mml:msup>\n                <\/mml:math><\/jats:alternatives><\/jats:inline-formula> spline space over the quad mesh in order to carry out least squares fitting over a point cloud, acquired by sampling the original CAD geometry. The resulting surface is a collection of B\u00e9zier patches with <jats:inline-formula><jats:alternatives><jats:tex-math>$$G^1$$<\/jats:tex-math><mml:math xmlns:mml=\"http:\/\/www.w3.org\/1998\/Math\/MathML\">\n                  <mml:msup>\n                    <mml:mi>G<\/mml:mi>\n                    <mml:mn>1<\/mml:mn>\n                  <\/mml:msup>\n                <\/mml:math><\/jats:alternatives><\/jats:inline-formula> regularity. Finally, we use the basis functions to perform isogeometric analysis simulations of realistic PDEs on the reconstructed <jats:inline-formula><jats:alternatives><jats:tex-math>$$G^1$$<\/jats:tex-math><mml:math xmlns:mml=\"http:\/\/www.w3.org\/1998\/Math\/MathML\">\n                  <mml:msup>\n                    <mml:mi>G<\/mml:mi>\n                    <mml:mn>1<\/mml:mn>\n                  <\/mml:msup>\n                <\/mml:math><\/jats:alternatives><\/jats:inline-formula> model. The quality of the construction is demonstrated via several numerical examples performed on a collection of CAD objects presenting various challenging realistic shapes.<\/jats:p>","DOI":"10.1007\/s00366-024-02065-0","type":"journal-article","created":{"date-parts":[[2024,9,23]],"date-time":"2024-09-23T17:02:04Z","timestamp":1727110924000},"page":"3429-3447","update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":2,"title":["From CAD to representations suitable for isogeometric analysis: a complete pipeline"],"prefix":"10.1007","volume":"40","author":[{"given":"Michelangelo","family":"Marsala","sequence":"first","affiliation":[]},{"given":"Angelos","family":"Mantzaflaris","sequence":"additional","affiliation":[]},{"given":"Bernard","family":"Mourrain","sequence":"additional","affiliation":[]},{"given":"Sam","family":"Whyman","sequence":"additional","affiliation":[]},{"given":"Mark","family":"Gammon","sequence":"additional","affiliation":[]}],"member":"297","published-online":{"date-parts":[[2024,9,23]]},"reference":[{"key":"2065_CR1","doi-asserted-by":"crossref","unstructured":"Boggs P, Althsuler A, Larzelere A, Walsh E, Clay R (2005) Hardwick M, DART system analysis., Tech Rep SAND2005-4647 (OSTI)","DOI":"10.2172\/876325"},{"key":"2065_CR2","doi-asserted-by":"crossref","unstructured":"Cottrell J, Hughes T, Bazilevs Y (2009) Isogeometric analysis: toward integration of CAD and FEA, John Wiley & sons, Ltd","DOI":"10.1002\/9780470749081"},{"key":"2065_CR3","doi-asserted-by":"crossref","unstructured":"Bianconi F, Conti P, Di\u00a0Angelo L (2006) Interoperability among CAD\/CAM\/CAE systems: a review of current research trends, In: Geometric Modeling and Imaging\u2013New Trends (GMAI\u201906), pp. 82\u201389","DOI":"10.1109\/GMAI.2006.30"},{"key":"2065_CR4","unstructured":"Zorin D, Schr\u00f6der P, Derose A, Kobbelt L, Levin A, Sweldens W (2000) Subdivision for modeling and animation, course Notes of SIGGRAPH"},{"key":"2065_CR5","doi-asserted-by":"crossref","DOI":"10.1007\/978-3-540-76406-9","volume-title":"Subdivision surfaces","author":"J Peters","year":"2008","unstructured":"Peters J, Reif U (2008) Subdivision surfaces. 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