SAA_nurbsSurfaceGetKnots
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SAA_nurbsSurfaceGetKnots

SAA_nurbsSurfaceSetKnots()

Sets and retrieves knot values for a NURBS surface.

set scene [SAA_AllocScene]

set nurbsSurface [SAA_AllocElem]

.

.

.

set shape_id [shape_id] or "NULL"

set nbKnotsU [get_number_of_U_knots]
set nbKnotsU [get_number_of_V_knots]
set knotsU [SAA_AllocDouble nbKnotsU]
set knotsV [SAA_AllocDouble nbKnotsV]
SAA_nurbsSurfaceGetKnots  $scene $nurbsSurface $SAA_Constants(SAA_GEOM_xxx) $shape_id $nbKnotsU $nbKnotsV $knotsU $knotsV 

set scene [SAA_AllocScene]
set nurbsSurface [SAA_AllocElem]
.
.
.
set shape_id [shape_id] or "NULL"
set nbKnotsU [get_number_of_U_knots] set nbKnotsU [get_number_of_V_knots] set knotsU [SAA_AllocDouble nbKnotsU] set knotsV [SAA_AllocDouble nbKnotsV] .
.
SAA_nurbsSurfaceSetKnots $scene $nurbsSurface $SAA_Constants(SAA_GEOM_xxx) $shape_id $nbKnotsU $nbKnotsV $knotsU $knotsV

nurbsSurface

A NURBS surface.

geomtype

Specifies the geometry type:

• SAA_GEOM_ORIGINAL for the original non-deformed geometry.
• SAA_GEOM_DEFORMED for the deformed geometry (if any deformation is applied).
• SAA_GEOM_SHAPE to access shapes, if any.

shape_id

Identifies the shape if the geometry type is SAA_GEOM_SHAPE. To get the shape ids, use SAA_modelGetNbShapes.

nbKnotsU

Number of knots in the U direction. To get this number, use SAA_nurbsSurfaceGetNbKnots.

nbKnotsV

Number of knots in the V direction. To get this number, use SAA_nurbsSurfaceGetNbKnots.

knotsU

Array of knot values in the U direction. The calling function is responsible for allocating this array (the required size is nbKnotsU).

knotsV

Array of knot values in the U direction. The calling function is responsible for allocating this array (the required size is nbKnotsV).

Return Value

Return correct usage if incorrect parameters are passed

Notes

The size of a knot vector depends on the order of the curve and whether it is open or closed. As well, SOFTIMAGE 3D uses different start and end knot values depending on whether the curve is open or closed.

If M is the number of knots, N is the number of control vertices, and O is the order of the curve (order = degree + 1), then:

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copyright Video-Collage Inc.