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SAA_nurbsSurfaceSplit
Splits a closed NURBS surface into a new NURBS surface that is open at the split point.
Splits an open NURBS surface into two new NURBS surfaces.
SAA_nurbsSurfaceSplit pscn pelmSrf gtype iShape dir dVal nSrfNew pelmSrfNew
pelmSrf
A NURBS surface. Use SAA_AllocElem to allocate it.
geomtype
Specifies what geometry you want to work with:
SAA_GEOM_ORIGINAL for the original, non-deformed geometry.SAA_GEOM_DEFORMED for deformed geometry (if any deformations, such as
lattice, curve, surface, wave, qstretch, flexible envelope, or other custom effects, are
applied to the model). To check if a model is deformed, use SAA_modelIsDeformed().SAA_GEOM_SHAPE to access shapes (the shapeid argument
specifies which shape).
Use global array SAA_Constants to get actual values of the constants, for example
$SAA_Constants(SAA_GEOM_ORIGINAL).
shapeid
Identifies the shape if the geometry type is SAA_GEOM_SHAPE. To get the
shape identifiers, use SAA_modelGetNbShapes().
dir
Specifies whether to split the surface in the U direction or the V direction.
SAA_U_DIRECTION SAA_V_DIRECTION
dVal
Knot value at which to split the surface.
nSrfNew
Number of new NURBS surfaces. If pelmSrf is closed in the specified
direction, nSrfNew is 1. Otherwise, if pelmSrf is
open, nSrfNew is 2.
pelmSrfNew
Returns the new NURBS surfaces. Use SAA_AllocElem to allocate it.
Possible Errors
SI_ERR_WRONG_COUNT if nSrfNew does not match the actual number
of new surfaces created by the split. Extra surfaces pointed to by pelmSrfNew
are marked as invalid.
See Also
Example
This code fragment shows how to bisect a NURBS surface.
proc SAA_nurbsSurfaceSplitExample {} {
global SAA_Constants
set scene [SAA_AllocScene]
SAA_sceneGetCurrent $scene
package require SW
set surface [SW_name2Element grid1 $scene]
SAA_nurbsSurfaceGetClosed $scene $surface closed0 closed1
SAA_nurbsSurfaceGetNbKnots $scene $surface nbKnots0 nbKnots1
set knots0 [SAA_AllocDouble $nbKnots0]
set knots1 [SAA_AllocDouble $nbKnots1]
SAA_nurbsSurfaceGetKnots $scene $surface
$SAA_Constants(SAA_GEOM_DEFORMED) \
0 $nbKnots0 $nbKnots1 $knots0 $knots1
set dval [expr ([access $knots0 0] + [access $knots0 [expr
$nbKnots0 - 1]]) / 2]
if { $closed0 == 0 } {
set nSrfNew 2
} else {
set nSrfNew 1
}
set newSurfaces [SAA_AllocElem $nSrfNew]
SAA_nurbsSurfaceSplit $scene $surface $SAA_Constants(SAA_GEOM_DEFORMED)
\
0 $SAA_Constants(SAA_U_DIRECTION) $dval
$nSrfNew $newSurfaces
foreach item "$scene $surface $knots0 $knots1 $newSurfaces" {
SAA_Free $item
}
}
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SAA_nurbsSurfaceSplit