TKE_NURBS_Surface
Opcode
| ASCII | A |
| Hexadecimal | 0x41 |
| Decimal | 65 |
Operands
Byte options, Byte u_degree, Byte v_degree, Long u_count, Long v_count,
(u_count x v_count)xPoint control_points, [(u_count x v_count)xFloat weights],
[(u_count+degree+1)xFloat u_knots],
[(v_count+degree+1)xFloat v_knots],
[variable trims]
| options | bitmask indicating which options are present |
| u_degree | degree of the surface in the u direction |
| v_degree | degree of the surface in the v direction |
| u_count | number of control points in the surface in the u direction |
| v_count | number of control points in the surface in the v direction |
| v_count | number of control points in the surface in the v direction |
| control_points | u_count x v_count triplets of x, y, z data. A two dimensional array sorted such that the v direction is varying fastest |
| weights | u_count x v_count weight factors. Arranged in the same order as control_points. |
| knots | u_count + degree + 1 knot values in the u direction |
| knots | v_count + degree + 1 knot values in the v direction |
Notes
Option flags:
| 0001 | Weights are specified |
| 0002 | Knots are specified |
| 0004 | Surface is trimmed |
Surface is inserted into the currently opened segment.
If trim operations are present, as indicated by the one of the bits in options, the surface is followed by a variable-length list of trim operations, as described in trim.html.
NURBS Surfaces were first added with version 7.0.
