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curveOnSurface [-append] [-degree] [-knot float] [-periodic boolean] [-positionUV float float] [-replace]
string
curveOnSurface is undoable, queryable, and editable.
The curve-on-surface command creates a new curve-on-surface from a
list of control vertices (CVs). A string is returned containing
the pathname to the newly created curve-on-surface.
You can replace an existing curve by using the "-r/replace"
flag. You can append points to an existing curve-on-surface by
using the "-a/append" flag.
See also the curve command, which describes how to query curve
attributes.
string
- name of new curve-on-surface
In query mode, return type is based on queried flag.
curve
append, degree, knot, periodic, positionUV, replace
| Long name (short name) |
argument types |
Properties |
-degree(-d)
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The degree of the new curve. Default is 3. Note that you need
degree+1 curve points to create a visible curve span, eg. you
must place 4 points for a degree 3 curve.
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-replace(-r)
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Replaces an entire existing curve.
If you use this flag, you must specify the name of the curve to
replace, at the end of the command. (See examples below.)
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-append(-a)
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Appends point(s) to the end of an existing curve.
If you use this flag, you must specify the name of the
curve to append to, at the end of the command. (See examples
below.)
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-positionUV(-uv)
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float float
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The uv position of a point.
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-knot(-k)
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float
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A knot value in a knot vector. One flag per knot value.
There must be (numberOfPoints + degree - 1) knots and the knot
vector must be non-decreasing.
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-periodic(-per)
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boolean
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If on, creates a curve that is periodic. Default is off.
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Flag can appear in Create mode of command
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Flag can appear in Edit mode of command
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Flag can appear in Query mode of command
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Flag can be used more than once in a command
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curveOnSurface -d 3 -uv 0 0 -uv 0.3 0.5 -uv 0.5 0.6 -uv 0.9 1.0 surface1;
// This command creates a curve-on-surface of degree three with
// four control vertices on surface1.
curveOnSurface -uv 0 0 -uv 0.3 0.5 -uv 0.5 0.6 -uv 0.7 0.8 -uv 1.0 1.0 -k 0 -k 0 -k 0 -k 1 -k 2 -k 2 -k 2 surface1;
// This command creates a curve-on-surface with five CVs
// and a knot vector, on surface1. Notice that there must be
// (number of CVs + degree - 1) knots and that the knot
// vector must be non-decreasing.
curveOnSurface -degree 3 -per on -uv 0 0 -uv 0.2 0.6 -uv 0.4 0.7 -uv 0.9 0.9 -uv 0.0 0.0 -uv 0.2 0.6 -uv 0.4 0.7 -k -2 -k -1 -k 0 -k 1 -k 2 -k 3 -k 4 -k 5 -k 6 surface1;
// This command creates a closed (or "periodic") curve-on-surface with
// four distinct CVs. You must specify a knot vector when the
// "-per" flag is on. Notice that the first "degree" points
// are the same as the last "degree" points (ie. the first three
// points are the same as the last three points). Notice also
// that the knot spacing between the first "degree" knots must
// be the same as the spacing between the last "degree" knots
// (ie. the space between the 1st and 2nd knots is the same as
// the space between the 7th and 8th knots, and the space between
// the 2nd and 3rd knots is the same as the space between the
// 8th and 9th knots). There must be space between the first
// "degree" knots, unlike the previous example, where the first
// "degree" knots are the same.
curveOnSurface -append -uv 1.0 1.0 surface1->curve1;
// This command appends a point to an existing curve-on-surface.
// Notice that the curve-on-surface is specified, not just the surface.
curveOnSurface -replace -d 1 -uv 1.0 1.0 -uv 2.0 2.0 surface1->curve1;
// This command replaces an existing curve, surface1->curve1, with a
// new curve of degree 1 having the given points. Do not use this
// flag on a curve that is a result of a construction history operation.