| 摘要 |
<p>The invention is directed to a computer program product, a computer system and a computer-implemented method for creating a parametric surface (16), comprising the steps of :
- providing a base mesh (15) having a plurality of outer or inner vertices (24, 25, 101) with valence greater than two, said vertices defining faces and at least one of said vertices being an extraordinary vertex (25, 101) defined as being different from:
- an outer vertex with valence two;
- an outer vertex with valence three; or
- a inner vertex with valence four (24),
- converting faces of the base mesh into parametric elementary surfaces (103, 104, 105);
- trimming at least one (105) of said parametric elementary surfaces located in the vicinity of said extraordinary vertex (101), according to:
- at least two parametric elementary surfaces (103, 104) adjacent to said at least one parametric elementary surface (111); and
- the base mesh (15); and
- constructing at least one parametric elementary surface (123, 124), adjacent to said trimmed parametric elementary surface (102), wherein the resulting parametric elementary surfaces (102, 103, 104, 123, 124) form the parametric surface (16).</p> |
