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HansPeter Seidel, "An Introduction to Polar Forms," IEEE Computer Graphics and Applications, vol. 13, no. 1, pp. 3846, January/February, 1993.  
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@article{ 10.1109/38.180116, author = {HansPeter Seidel}, title = {An Introduction to Polar Forms}, journal ={IEEE Computer Graphics and Applications}, volume = {13}, number = {1}, issn = {02721716}, year = {1993}, pages = {3846}, doi = {http://doi.ieeecomputersociety.org/10.1109/38.180116}, publisher = {IEEE Computer Society}, address = {Los Alamitos, CA, USA}, }  
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TY  MGZN JO  IEEE Computer Graphics and Applications TI  An Introduction to Polar Forms IS  1 SN  02721716 SP38 EP46 EPD  3846 A1  HansPeter Seidel, PY  1993 VL  13 JA  IEEE Computer Graphics and Applications ER   
Polar forms, which simplify the construction of polynomial and piecewisepolynomial curves and surfaces and lead to new surface representations and algorithms, are reviewed. The polar forms of polynomial curves, Bezier curves, and Bspline are discussed. Tensor product surfaces, the most popular surfaces in computeraided geometric design, true surfaces, Bezier triangles, Bpatches, and a triangular Bspline scheme that combines Bpatches and simplex splines are also discussed.
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