SYSTEMS AND METHODS FOR LIGHTWEIGHT PRECISE 3D VISUAL FORMAT

1 . A method performed by a data processing system, comprising:

producing a three-dimensional (3D) parameter space mesh representation of a computer-aided design (CAD) model, wherein:

the 3D parameter space mesh representation includes a plurality of curve-based vertices and a plurality of surface-based vertices,

each curve-based vertex corresponds to a boundary-representation (B-Rep) curve and is represented by a reference to a curve of a surface of the 3D CAD model and by at least one curve parameter value, and

each surface-based vertex corresponds to a B-Rep surface and is presented as a reference to a respective surface of the 3D CAD model and a plurality of parameters on the respective surface; and

storing the 3D parameter space mesh representation of the CAD model.

2 . The method of claim 1 , further comprising evaluating a model space mesh of the 3D parameter space mesh representation by evaluating the plurality of curve-based vertices and by evaluating the plurality of surface-based vertices.

3 . The method according to claim 1 , further comprising adding new curve-based vertices to the 3D parameter space mesh representation.

4 . The method according to claim 1 , further comprising adding new surface-based vertices to the 3D parameter space mesh representation.

5 . The method according to claim 1 , further comprising refining the 3D parameter space mesh representation by computing geometry of new vertices between two curve-based vertices, between a curve-based vertex and a surface-based vertex, or between two surface-based vertices.

6 . The method according to claim 1 , further comprising refining the 3D parameter space mesh representation using a first parameter that defines a maximum allowed deviation of original curve geometry to an existing edge and using a second parameter that defines a maximum allowed angle that can be formed between a candidate new edge and an existing edge.

7 . The method according to claim 1 , further comprising performing triangle splitting according to vertices added to the 3D parameter space mesh representation.

8 . The method according to claim 1 , wherein the 3D parameter space mesh representation includes a vertex record table and a plurality of relative indices.

9 . A data processing system comprising:

a processor; and

an accessible memory, the data processing system particularly configured to:

produce a three-dimensional parameter space mesh representation of a computer-aided design model, wherein:

the 3D parameter space mesh representation includes a plurality of curve-based vertices and a plurality of surface-based vertices,

each curve-based vertex corresponds to a boundary-representation curve and is represented by a reference to a curve of a surface of the 3D CAD model and by at least one curve parameter value, and

each surface-based vertex corresponds to a B-Rep surface and is presented as a reference to a respective surface of the 3D CAD model and a plurality of parameters on the respective surface; and

store the 3D parameter space mesh representation of the CAD model.

10 . (canceled)

11 . The data processing system of claim 9 , wherein the data processing system is further configured to evaluate a model space mesh of the 3D parameter space mesh representation by evaluating the plurality of curve-based vertices and by evaluating the plurality of surface-based vertices.

12 . The data processing system of claim 9 , wherein the data processing system is further configured to add new curve-based vertices to the 3D parameter space mesh representation.

13 . The data processing system of claim 9 , wherein the data processing system is further configured to add new surface-based vertices to the 3D parameter space mesh representation.

14 . The data processing system of claim 9 , wherein the data processing system is further configured to refine the 3D parameter space mesh representation by computing geometry of new vertices between two curve-based vertices, between a curve-based vertex and a surface-based vertex, or between two surface-based vertices.

15 . The data processing system of claim 9 , wherein the data processing system is further configured to refine the 3D parameter space mesh representation using a first parameter that defines a maximum allowed deviation of original curve geometry to an existing edge, and using a second parameter that defines a maximum allowed angle that can be formed between a candidate new edge and an existing edge.

16 . The data processing system of claim 9 , wherein the data processing system is further configured to perform triangle splitting according to vertices added to the 3D parameter space mesh representation.

17 . The data processing system of claim 9 , wherein the 3D parameter space mesh representation includes a vertex record table and a plurality of relative indices.

18 . A non-transitory computer-readable medium encoded with executable instructions that, when executed, cause one or more data processing systems to:

produce a three-dimensional parameter space mesh representation of a computer-aided design model, wherein:

the 3D parameter space mesh representation includes a plurality of curve-based vertices and a plurality of surface-based vertices,

each curve-based vertex corresponds to a boundary-representation curve and is represented by a reference to a curve of a surface of the 3D CAD model and by at least one curve parameter value, and

each surface-based vertex corresponds to a B-Rep surface and is presented as a reference to a respective surface of the 3D CAD model and a plurality of parameters on the respective surface; and

store the 3D parameter space mesh representation of the CAD model.

19 . The non-transitory computer-readable medium of claim 18 , wherein the executable instructions further cause the one or more data processing systems to evaluate a model space mesh of the 3D parameter space mesh representation by evaluating the plurality of curve-based vertices and by evaluating the plurality of surface-based vertices.

20 . The non-transitory computer-readable medium of claim 18 , wherein the executable instructions further cause the one or more data processing systems to add new curve-based vertices to the 3D parameter space mesh representation.

21 . The non-transitory computer-readable medium of claim 18 , wherein the executable instructions further cause the one or more data processing systems to add new surface-based vertices to the 3D parameter space mesh representation.

22 . The non-transitory computer-readable medium of claim 18 , wherein the executable instructions further cause the one or more data processing systems to refine the 3D parameter space mesh representation by computing geometry of new vertices between two curve-based vertices, between a curve-based vertex and a surface-based vertex, or between two surface-based vertices.

23 . The non-transitory computer-readable medium of claim 18 , wherein the executable instructions further cause the one or more data processing systems to refine the 3D parameter space mesh representation using a first parameter that defines a maximum allowed deviation of original curve geometry to an existing edge, and using a second parameter that defines a maximum allowed angle that can be formed between a candidate new edge and an existing edge.

24 . The non-transitory computer-readable medium of claim 18 , wherein the executable instructions further cause the one or more data processing systems to perform triangle splitting according to vertices added to the 3D parameter space mesh representation.

25 . The non-transitory computer-readable medium of claim 18 , wherein the 3D parameter space mesh representation includes a vertex record table and a plurality of relative indices.