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.