Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Trimmed Spline Surfaces with Accurate Boundary Control   We introduce trimmed NURBS surfaces with accurate boundary control, briefly
called ABC-surfaces, as a solution to the notorious problem of constructing
watertight or smooth ($G^1$ and $G^2)$ multi-patch surfaces within the function
range of standard CAD/CAM systems and the associated file exchange formats. Our
construction is based on the appropriate blend of a base surface, which traces
out the intended global shape, and a series of reparametrized ribbons, which
dominate the shape near the boundary.

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The categories of this paper are: funct-an
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The categories of this paper are: bayes-an
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The categories of this paper are: chem-ph
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The categories of this paper are: atom-ph
24
The categories of this paper are: dg-ga
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The categories of this paper are: q-alg
20
The categories of this paper are: acc-phys
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The categories of this paper are: mtrl-th
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The categories of this paper are: ao-sci
2
The categories of this paper are: math
3
The categories of this paper are: physics
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The categories of this paper are: stat
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The categories of this paper are: chao-dyn
17
The categories of this paper are: q-fin
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The categories of this paper are: supr-con
6
The categories of this paper are: astro-ph