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# Creating NURBSCVSurface Values

The following functions provide shorthand ways to construct NURBSCVSurface values that you can then add to a NURBSSet for creation in the scene.

    MakeNURBSLatheSurface <curve> <origin> <north> <start> <end>

This function generates a NURBS surface of revolution given an input curve, origin, up axis, and start and end angles. The output of this function is a NURBS Surface. Note that this is a CV surface that matches the definition, not a relational surface.

    curve <NURBSCurve>

This is the NURBS curve that is revolved.

    origin <point3>

Specifies the origin of the revolution.

    north <point3>

This is the axis that specified the up direction.

    start <float>

This is the start angle of the revolution in radians.

    end <float>

This is the end angle of the revolution in radians.

    MakeNURBSSphereSurface <radius> <center> <north_axis> <ref_axis> <startU> <endU> <startV> <endV> [open:<boolean>]

This function generates a NURBS sphere.

The output of this function is a NURBS Surface.

Note that this is a CV surface that matches the definition, not a relational surface.

    radius <float>

The radius of the sphere.

    center <Point3>

The center point of origin of the sphere.

    north_axis <Point3>

This specifies the up axis. Use (Point3 0 0 1) for the Z axis for example.

    ref_Axis <Point3>

This is the direction of the seam. The sphere primitive uses (Point3 0 -1 0) as this value.

The northAxis and refAxis must be perpendicular to one another.

    startU <float>

The start angle for the sphere in the U direction, specified in radians.

    endU <float>

The end angle for the sphere in the U direction, specified in radians.

    startV <float>

The start angle for the sphere in the V direction, specified in radians.

    endV <float>

The end angle for the sphere in the V direction, specified in radians.

    open: <boolean>

If true , the surface is closed; otherwise the surface is not closed. Defaults to false .

    MakeNURBSCylinderSurface <radius> <height> <origin> <sym_axis> <ref_axis> <start> <end> [open:<boolean>]

This function generates a NURBS cylinder. The output of this function is a NURBS Surface.

Note that this is a CV surface that matches the definition, not a relational surface.

    radius <float>

The radius of the cylinder.

    height <float>

The height of the cylinder.

    origin <Point3>

The origin of the cylinder.

    sym_Axis <Point3>

The axis of symmetry. The standard cylinder primitive specifies (Point3 0 0 1).

    ref_Axis <Point3>

This is the direction of the seam. The standard cylinder primitive specifies (Point3 0 1 0).

The symAxis and refAxis must be perpendicular to one another.

    start <float>

The start angle in radians.

    end <float>

The end angle in radians.

    open: <boolean>

If true , the surface is closed; otherwise the surface is not closed. Defaults to false .

    MakeNURBSConeSurface <radius1> <radius2> <height> <origin> <sym_axis> <ref_axis> <start> <end> [open:<boolean>]

This function generates a NURBS cone surface. The output of this function is a NURBS Surface. Note that this is a CV surface that matches the definition, not a relational surface.

    radius1 <float>

One of the radii of the cone.

    radius2 <float>

The other radius of the cone.

    height <float>

The height of the cone.

    origin <Point3>

The origin of the cone.

    sym_Axis <Point3>

The axis of symmetry.

    ref_Axis <Point3>

This is the direction of the seam.

The symAxis and refAxis must be perpendicular to one another.

    start <float>

The start angle in radians.

    end <float>

The end angle in radians.

    open: <boolean>

If true , the surface is closed; otherwise the surface is not closed. Defaults to false .

    MakeNURBSTorusSurface <majorRad> <minorRad> <origin> <sym_axis> <ref_axis> <startU> <endU> <startV> <endV> [open:<boolean>]

This function generates a NURBS torus surface. The output of this function is a NURBS Surface. Note that this is a CV surface that matches the definition, not a relational surface.

Note

This surface is not closed surface.

    majorRad <float>

This is the radius of the entire 'donut' shape.

    minorRad <float>

The is the radius of the 'tube'.

    origin <Point3>

The origin of the cone.

    sym_Axis <Point3>

The axis of symmetry.

    ref_Axis <Point3>

This is the direction of the seam. The symAxis and refAxis must be perpendicular to one another.

    startU <float>

The start angle of the torus in the U direction.

    endU <float>

The end angle of the torus in the U direction.

    startV <float>

The start angle of the torus in the V direction.

    endV <float>

The end angle of the torus in the V direction.

    open: <boolean>

If true , the surface is closed; otherwise the surface is not closed. Defaults to false .