Patch Input Format
- Last UpdatedOct 05, 2023
- 1 minute read
This format is intended for the transfer of patches from CAD systems, , where a SAT file or IGES file is not available. The format will only handle cubic patches. It is assumed that the user will generate this data by writing a conversion utility. It is not intended as a means of manually inputting patch data.
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Record 1 |
Alphanumeric header. |
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Record 2 |
Integer number of knots in the S direction in the parametric mapping (NS). |
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Record 3 |
Knot value (this record is repeated NS times). |
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Record 4 |
Integer number of knots in the T direction in the parametric mapping (NT). |
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Record 5 |
Knot value (this record is repeated NT times). |
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Record 6 |
Integer number of S direction polygon points (must be NS - 4). |
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Record 7 |
Integer number of T direction polygon points (must be NT - 4). |
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Record 8 |
X,Y,Z values of polygon point (this record is repeated NT-4 times to define the column) |
Records 7 & 8 are repeated NS - 4 times.